In the present disclosure, the receiving interface is used to receive digital or analog signals including data or electric power. The signals on the receiving interface may be transmitted through accessory components such as, but not limited to, transmission lines, connectors, amplifiers or other components. The receiving interface at least includes one receiver for processing the transmitted signal. Therefore, the receiving interface may include a digital interface, an analog transmission interface or a power transmission interface.

Different configurations of circuit components of the noise suppression circuit of the present disclosure are exemplified in different embodiments as described as follows, but the present disclosure is not limited thereto.

First Embodiment

Reference is made to FIG. 1, which is a schematic diagram of a noise suppression circuit disposed between a transmission interface and a receiving interface according to a first embodiment of the present disclosure.

It is worth noting that, as shown in FIG. 1, a noise suppression circuit SYS0 of the first embodiment of the present disclosure is disposed between a transmission interface TX0 and a receiving interface RX0. The transmission interface TX0 includes a digital interface, a power transmission interface or a combination thereof.

For example, if the transmission interface TX0 is the digital interface, the transmission interface TX0 may include a universal serial bus (USB), a high definition multimedia interface (HDMI), a PCI express (PCIE) interface, a serial ATA (SATA) interface, a mobile industry processor interface (MIPI), a Thunderbolt (TB) interface, a DisplayPort (DP) interface, a gigabit media independent interface (GMII), a network cable, or any combination thereof, but the present disclosure is not limited thereto.

For example, if the transmission interface TX0 is the power transmission interface, the transmission interface TX0 may include a power plane, a power distribution network, a power transmission line, or any combination thereof, but the present disclosure is not limited thereto.

One or more transmission interface signals on the transmission interface TX0 are transmitted through a transmission path TP0. One or more receiving interface signals on the receiving interface RX0 are transmitted through a transmission path RP0. The transmission interface TX0 includes a transmitter TCR and an accessory component TPU. The transmitter TCR and the accessory component TPU are disposed on the transmission path TP0 of the transmission interface TX0. The receiving interface RX0 includes a receiver RCR and an accessory component RPU. The receiver RCR and the accessory component RPU are disposed on the transmission path RP0 of the receiving interface RX0.

The transmission path TP0 is an independent physical path such as a power supply line or a telephone line and is used to transmit signals or power. The accessory component TPU may be disposed on the transmission path TP0. The accessory component TPU may include a transmission line, a resistor, a capacitor, an inductor, an amplifier, a filter, an oscillator, a mixer, etc. In practice, the plurality of transmission paths TP0 may be disposed, and the transmission interface signals transmitted on the plurality of transmission paths TP0 may be modulated by a system such as a differential transmission system or a three-phase circuit system. For example, if the two transmission paths TP0 are disposed, the transmission interface signals transmitted on the two transmission paths TP0 are differential signals, but common mode signals are usually considered noise.

The noise suppression circuit SYS0 includes a first noise suppression component S1 and a second noise suppression component S2.

The first noise suppression component S1 is connected to the transmission path TP0 of the transmission interface TX0.

The second noise suppression component S2 is connected to the receiving interface RX0 of the transmission path RP0.

The second noise suppression component S2 is connected to the first noise suppression component S1 through a phase adjusting component S3. The one or more transmission interface signals on the transmission interface TX0 are transmitted through the first noise suppression component S1, the phase adjusting component S3 and the second noise suppression component S2 to the receiving interface RX0 for suppressing interference from the transmission interface TX0 to the receiving interface RX0.

The first noise suppression component S1 includes a first conductor CD1-1. The first conductor CD1-1 of the first noise suppression component S1 is disposed on the transmission path TP0 on the transmission interface TX0. The first conductor CD1-1 is electrically connected to the phase adjusting component S3, or is electromagnetically coupled with the phase adjusting component S3.

The first conductor CD1-1 of the first noise suppression component S1 obtains some or all of the power from the transmitter TCR along the transmission path TP0, and then transmits the obtained power to the phase adjusting component S3. A phase of the power may be adjusted by the phase adjusting component S3. Then, the (adjusted) power is transmitted from the phase adjusting component S3 to the second noise suppression component S2.

The second noise suppression component S2 includes the first conductor CD1-1. The first conductor CD1-1 of the second noise suppression component S2 is connected to the transmission path RP0 of the receiving interface RX0 and the phase adjusting component S3. The first conductor CD1-1 of the second noise suppression component S2 obtains parts or all of the power of the first conductor CD1-1 of the first noise suppression component S1 from the phase adjusting component S3. Then, the power is transmitted to the receiver RCR along the transmission path RP0 of the receiving interface RX0.

The phase adjusting component S3 of the noise suppression circuit SYS0 includes a transmission medium having a specific physical length and an artificially synthesized delay circuit. The signals and noise are transmitted through the transmission medium and the artificially synthesized delay circuit. For example, the phase adjusting component S3 includes a transmission line (such as a coaxial cable, a twisted wire, a microstripline, stripline, coplanar waveguide, etc.), a phase synthesis circuit, a T-network, a Pi-network, a bridge circuit and a left-hand line, but the present disclosure is not limited thereto.

The first noise suppression component S1 and the second noise suppression component S2 may be specific physical structures or circuits. For example, each of the first noise suppression component S1 and the second noise suppression component S2 may include a branch-line coupler, a rat-race coupler, a couple-line coupler, a power divider, a circulator, sensor circuit, an amplifier or follower or any combination thereof. In addition, the first noise suppression component S1 and the second noise suppression component S2 may also be external structures combined with some original transmission structures of the transmission interface or the receiving interface. For example, a metal structure may be attached around a specific transmission line segment on a circuit board, and the attached metal structure and the specific transmission line segment together form the first noise suppression component S1 and the second noise suppression component S2.

In actual applications, the first noise suppression component S1 and the second noise suppression component S2 may be designed or manufactured together with the transmission interface TX0. An interface connected between the first noise suppression component S1 and the phase adjustment component S3, and an interface connected between the second noise suppression component S2 and the phase adjustment component S3 are reserved. For example, one or both of the first noise suppression component S1 and the second noise suppression component S2 of the present disclosure may be implemented with metal patterns on a circuit board where the transmission interface TX0 is located, or may be designed on a cable carrying the transmission interface TX0 to provide the same functions.

In other applications, the first noise suppression component S1 and the second noise suppression component S2 may be implemented in a composite manner. For example, the first noise suppression component S1 and the second noise suppression component S2 may be external structures attached or covered on the transmission interface TX0 or the receiving interface RX0. The first noise suppression component S1 and the second noise suppression component S2 may include the transmission interface TX0 or the receiving interface RX0, and the attached or covered external structures.

In addition, the first noise suppression component S1 and the second noise suppression component S2 of the noise suppression circuit SYS0 of the present disclosure may be independent structures, and may be connected to the transmission interface TX0 or the receiving interface RX0.

Second Embodiment

Reference is made to FIG. 2, which is a first schematic diagram of a noise suppression circuit disposed between a transmission interface and a receiving interface according to a second embodiment of the present disclosure.

It is worth noting that, as shown in FIG. 2, a noise suppression circuit SYS1 of a second embodiment of the present disclosure is disposed between a transmission interface TX1 and a receiving interface RX1. The transmission interface TX1 includes the digital interface, the power transmission interface or a combination thereof.

The descriptions of the noise suppression circuit SYS1 as shown in FIG. 2 that are the same as the descriptions of the noise suppression circuit SYS0 as shown in FIG. 1 are not repeated herein.

One difference between the noise suppression circuit SYS1 as shown in FIG. 2 and the noise suppression circuit SYS0 as shown in FIG. 1 is that, the noise suppression circuit SYS1 as shown in FIG. 2 not only includes a second conductor CD2-1, but also includes a third conductor CD3-1.

The second conductor CD2-1 of the noise suppression circuit SYS1 is disposed on a transmission path TP1 of the transmission interface TX1. In the first noise suppression component S1, the third conductor CD3-1 is disposed at one side of the second conductor CD2-1, and is electromagnetically coupled with the second conductor CD2-1. In the first noise suppression component S1, the third conductor CD3-1 obtains parts or all of power transmitted onto the second conductor CD2-1, or the second conductor CD2-1 obtains parts or all of power transmitted onto the third conductor CD3-1. The third conductor CD3-1 of the first noise suppression component S1 is electrically connected to the phase adjusting component S3, or is electromagnetically coupled with the phase adjusting component S3. Parts or all of the power on the transmission path TP1 is transmitted sequentially through the second conductor CD2-1 of the first noise suppression component S1, the third conductor CD3-1 of the first noise suppression component S1 and the phase adjusting component S3 to the second noise suppression component S2.

The electromagnetic coupling is realized by distributed capacitors. For example, components used for realizing the electromagnetic field coupling may include capacitors, metal plates, transistors, diodes and other structures.

The electromagnetic coupling is a phenomenon in which an electromotive force is caused by a change in a current of an adjacent conductor. For example, components for realizing the electromagnetic coupling may include an inductor, a coupled-line, a magnetically permeable structure or other structures.

Another difference between the noise suppression circuit SYS1 as shown in FIG. 2 and the noise suppression circuit SYS0 as shown in FIG. 1 is that, the second noise suppression component S2 as shown in FIG. 2 not only includes the second conductor CD2-1, but also includes the third conductor CD3-1.

The second conductor CD2-1 of the second noise suppression component S2 is disposed on a transmission path RP1 of the receiving interface RX1. In the second noise suppression component S2, the third conductor CD3-1 is disposed at one side of the second conductor CD2-1, and the second conductor CD2-1 obtains parts or all of power transmitted onto the third conductor CD3-1.

Reference is made to FIG. 3, which is a second schematic diagram of the noise suppression circuit disposed between the transmission interface and the receiving interface according to the second embodiment of the present disclosure.

It is worth noting that, as shown in FIG. 3, the noise suppression circuit SYS1 of the second embodiment of the present disclosure is disposed between the transmission interface TX1 and the receiving interface RX1. The transmission interface TX1 includes the digital interface, the power transmission interface or a combination thereof.

The descriptions of the noise suppression circuit SYS1 as shown in FIG. 3 that are the same as the descriptions of the noise suppression circuit SYS1 as shown in FIG. 2 are not repeated herein.

One difference between the noise suppression circuit SYS1 as shown in FIG. 3 and the noise suppression circuit SYS1 as shown in FIG. 2 is that, the third conductor CD3-1 of the first noise suppression component S1 is further connected to an impedance component RSX1 as shown in FIG. 3, and the third conductor CD3-1 of the second noise suppression component S2 is further connected to an impedance component RSX2 as shown in FIG. 3.

Each of the impedance components RSX1 and RSX2 may include a resistor, a capacitor, an inductor, a transmission wire, or any combination thereof.

Reference is made to FIG. 4, which is third schematic diagram of the noise suppression circuit disposed between the transmission interface and the receiving interface according to the second embodiment of the present disclosure.

The descriptions of the noise suppression circuit SYS1 as shown in FIG. 4 that are the same as the descriptions of the noise suppression circuit SYS1 as shown in FIG. 2 are not repeated herein.

It is worth noting that, as shown in FIG. 4, the noise suppression circuit SYS1 of the second embodiment of the present disclosure is disposed between the transmission interface TX1 and the receiving interface RX1. The transmission interface TX1 includes the digital interface, the power transmission interface or a combination thereof.

As shown in FIG. 4, on one coupling path, the third conductor CD3-1 of the first noise suppression component S1 is connected to the third conductor CD3-1 of the second noise suppression component S2 through the phase adjusting component S3. On another coupling path, the third conductor CD3-1 of the first noise suppression component S1 is connected to the third conductor CD3-1 of the second noise suppression component S2 through a connection wire LN1 as a phase adjusting component.

Third Embodiment

Reference is made to FIG. 5, which is a first schematic diagram of a noise suppression circuit disposed between a transmission interface and a receiving interface according to a third embodiment of the present disclosure.

It is worth noting that, as shown in FIG. 5, a noise suppression circuit SYS2 of the third embodiment of the present disclosure is disposed between a transmission interface TX2 and a receiving interface RX2. The transmission interface TX2 includes the digital interface, the power transmission interface or a combination thereof.

Differences between the third embodiment and the first and second embodiments of the present disclosure are described as follows.

In the third embodiment, the noise suppression circuit SYS2 of the present disclosure is configured to eliminate interference from the transmission interface TX2 to the receiving interface RX2.

The noise suppression circuit SYS2 includes the first noise suppression component S1 and the second noise suppression component S2. The transmission interface TX2 includes the transmitter TCR and the accessory component TPU. The transmitter TCR and the accessory component TPU are disposed on a plurality of transmission paths TP1 to TPM. The receiving interface RX2 includes the receiver RCR and the accessory component RPU. The receiver RCR and the accessory component RPU are disposed on m transmission paths RP1 to RPN.

The first noise suppression component S1 is disposed on the plurality of transmission paths TP1 to TPM of the transmission interface TX2. The second noise suppression component S2 is disposed on n transmission paths RP1 to RPN of the receiving interface RX2.

The first noise suppression component S1 includes 2m+k coupling ports, wherein k>=1 and m>=1. Inside the first noise suppression component S1, 1st to mth signal input ports of the first noise suppression component S1 are connected respectively to (m+1)th to (2m)th signal output ports of the first noise suppression component S1. Outside the first noise suppression component S1, the 1st to mth signal input ports of the first noise suppression component S1 are connected respectively to the mth transmission paths TP1 to TPM at one side of the first noise suppression component S1 of the transmission interface TX2. Outside the first noise suppression component S1, the (m+1)th to (2m)th signal output ports of the first noise suppression component S1 are connected respectively to the m transmission paths TP1 to TPM at another side of the first noise suppression component S1 of the transmission interface TX2. The first noise suppression component S1 obtains parts or all of power transmitted on the m transmission paths TP1 to TPM, and outputs the power through the (2m+1)th to (2m+k)th coupling ports of the first noise suppression component S1. One or more of the (2m+i+1)th to the (2m+k)th coupling ports are connected to other interfaces through a path ATU-1.

The second noise suppression component S2 includes (2n+j)th coupling ports, wherein j>=1 and n>=1. Inside the second noise suppression component S2, 1st to nth signal output ports of the second noise suppression component S2 are connected respectively to (n+1)th to (2n)th signal input ports of the second noise suppression component S2 through n second conductors CD2-1 to CD2-N. Outside the second noise suppression component S2, the 1st to nth signal output ports of the second noise suppression component S2 are connected respectively to the n transmission paths RP1 to RPN at one side of the second noise suppression component S2 of the receiving interface RX2. Outside the second noise suppression component S2, the (n+1)th to (2n)th signal input ports of the second noise suppression component S2 are connected respectively to the n transmission paths RP1 to RPN at another side of the second noise suppression component S2 of the receiving interface RX2. The second noise suppression component S2 may receive or replicate parts or all of power at (2n+1)th to (2n+j)th coupling ports of the second noise suppression component S2, and outputs the power through the (1)th to (2n)th input ports of the second noise suppression component S2. One or more of the (2n+i+1)th to (2n+j)th coupling ports of the second noise suppression component S2 may be connected to other interfaces through a path ATU-2.

The first noise suppression component S1 may be connected to the second noise suppression component S2 through i coupling paths CP1 to CP1, in which i may be equal to or larger than 1. The noise suppression circuit SYS2 of the present disclosure at least includes the phase adjusting component S3 on each of the coupling paths CP1 to CP1 for providing a predetermined phase at a predetermined frequency.

As shown in FIG. 5, the second conductors CD2-1 to CD2-M are disposed inside the first noise suppression component S1. The second conductors CD2-1 to CD2-M are electrically connected to the (2m+1)th to (2m+k)th coupling ports of the first noise suppression component S1, or are electromagnetically coupled with the (2m+1)th to (2m+k)th coupling ports of the first noise suppression component S1.

The second conductors CD2-1 to CD2-N are disposed inside the second noise suppression component S2. The second conductors CD2-1 to CD2-N are electrically connected to the (2n+1)th to (2n+j)th coupling ports of the second noise suppression component S2, or are electromagnetically coupled with the (2n+1)th to (2n+j)th coupling ports of the second noise suppression component S2.

Direct current (DC) signals such as DC voltages or DC currents may be coupled or transmitted between the (−2m+1)th to (2m+k)th coupling ports and the (2n+1)th to (2n+j)th coupling ports.

One or more of the second conductors CD2-1 to CD2-M may be electromagnetically coupled with one or more of the (2m+1)th to (2m+k)th coupling ports caused by one or more capacitors. One or more of the second conductors CD2-1 to CD2-N may be electromagnetically coupled with one or more of the (2n+1)th to (2n+j)th coupling ports.

Reference is made to FIG. 6, which is a second schematic diagram of the noise suppression circuit disposed between the transmission interface and the receiving interface according to the third embodiment of the present disclosure.

It is worth noting that, as shown in FIG. 6, the noise suppression circuit SYS2 is disposed between the transmission interface TX2 and the receiving interface RX2. The transmission interface TX2 includes the digital interface, the power transmission interface or a combination thereof.

A difference between the noise suppression circuit SYS2 as shown in FIG. 6 and the noise suppression circuit SYS2 as shown in FIG. 5 is that, in the first noise suppression component S1 of the noise suppression circuit SYS2 as shown in FIG. 6, a sensor 1AD senses signals and noise of one or more of the second conductors CD2-1 to CD2-M to generate a sense result, and outputs the sense result to one or more of the (2m+1)th to (2m+k)th coupling ports of the first noise suppression component S1.

Reference is made to FIG. 7, which is a third schematic diagram of the noise suppression circuit disposed between the transmission interface and the receiving interface according to the third embodiment of the present disclosure.

It is worth noting that, as shown in FIG. 7, the noise suppression circuit SYS2 is disposed between the transmission interface TX2 and the receiving interface RX2. The transmission interface TX2 includes the digital interface, the power transmission interface or a combination thereof.

A difference between the noise suppression circuit SYS2 as shown in FIG. 7 and the noise suppression circuit SYS2 as shown in FIG. 5 is that, in the first noise suppression component S1 of the noise suppression circuit SYS2 as shown in FIG. 7, the (2m+i+1)th to (2m+k)th coupling ports of the first noise suppression component S1 are connected to the impedance component RSX1 as the terminal load. In practice, the (2n+i+1)th to (2n+j)th coupling ports of the second noise suppression component S2 may also be connected to an impedance component as the terminal load.

Reference is made to FIG. 8, which is a fourth schematic diagram of the noise suppression circuit disposed between the transmission interface and the receiving interface according to the third embodiment of the present disclosure.

It is worth noting that, as shown in FIG. 8, the noise suppression circuit SYS2 is disposed between the transmission interface TX2 and the receiving interface RX2. The transmission interface TX2 includes the digital interface, the power transmission interface or a combination thereof.

A difference between the noise suppression circuit SYS2 as shown in FIG. 8 and the noise suppression circuit SYS2 as shown in FIG. 5 is that, the noise suppression circuit SYS2 as shown in FIG. 8 includes one or more transmission line LNX having a specific length for providing the predetermined phase at the predetermined frequency. The transmission line LNX is connected between the (2m+1)th coupling port of the first noise suppression component S1 and the (2n+1)th coupling port of the second noise suppression component S2.

Reference is made to FIG. 9, which is a fifth schematic diagram of the noise suppression circuit disposed between the transmission interface and the receiving interface according to the third embodiment of the present disclosure.

It is worth noting that, as shown in FIG. 9, the noise suppression circuit SYS2 is disposed between the transmission interface TX2 and the receiving interface RX2. The transmission interface TX2 includes the digital interface, the power transmission interface or a combination thereof.

A difference between the noise suppression circuit SYS2 as shown in FIG. 9 and the noise suppression circuit SYS2 as shown in FIG. 5 is that, the phase adjusting component S3 of the noise suppression circuit SYS2 as shown in FIG. 9 includes a phase synthesis circuit PCC for providing the predetermined phase at the predetermined frequency. The phase synthesis circuit PCC may be connected to the (2m+1)th coupling port of the first noise suppression component S1 and the (2n+1)th coupling port of the second noise suppression component S2.

Reference is made to FIG. 10, which is a sixth schematic diagram of the noise suppression circuit disposed between the transmission interface and the receiving interface according to the third embodiment of the present disclosure.

It is worth noting that, as shown in FIG. 10, the noise suppression circuit SYS2 is disposed between the transmission interface TX2 and the receiving interface RX2. The transmission interface TX2 includes the digital interface, the power transmission interface or a combination thereof.

A difference between the noise suppression circuit SYS2 as shown in FIG. 10 and the noise suppression circuit SYS2 as shown in FIG. 5 is that, the noise suppression circuit SYS2 as shown in FIG. 10 includes one or more intensity adjusting circuit AM1 on one or more of the plurality of coupling paths CP1 to CP1 for adjusting power transmitted on one or more of the plurality of coupling paths CP1 to CP1 at the predetermined frequency. The intensity adjusting circuit AM1 may include an attenuator or an amplifier.

When the intensity adjusting circuit AM1 is the attenuator, the intensity adjusting circuit AM1 may reflect or convert parts of the power transmitted on the one or more of the plurality of coupling paths CP1 to CP1 into heat power at the predetermined frequency.

When the intensity adjusting circuit AM1 is the amplifier, the intensity adjusting circuit AM1 may amplify the power transmitted on the one or more of the plurality of coupling paths CP1 to CP1 at the predetermined frequency.

Reference is made to FIG. 11, which is a seventh schematic diagram of the noise suppression circuit disposed between the transmission interface and the receiving interface according to the third embodiment of the present disclosure.

It is worth noting that, as shown in FIG. 11, the noise suppression circuit SYS2 is disposed between the transmission interface TX2 and the receiving interface RX2. The transmission interface TX2 includes the digital interface, the power transmission interface or a combination thereof.

A difference between the noise suppression circuit SYS2 as shown in FIG. 11 and the noise suppression circuit SYS2 as shown in FIG. 5 is that, the noise suppression circuit SYS2 as shown in FIG. 11 includes one or more filter circuit F1 on one or more of the plurality of coupling paths CP1 to CP1.

Reference is made to FIG. 12, which is an eighth schematic diagram of the noise suppression circuit disposed between the transmission interface and the receiving interface according to the third embodiment of the present disclosure.

It is worth noting that, as shown in FIG. 12, the noise suppression circuit SYS2 is disposed between the transmission interface TX2 and the receiving interface RX2. The transmission interface TX2 includes the digital interface, the power transmission interface or a combination thereof.

A difference between the noise suppression circuit SYS2 as shown in FIG. 9 and the noise suppression circuit SYS2 as shown in FIG. 5 is that, in the noise suppression circuit SYS2 as shown in FIG. 9, a physical structure PS1 is used on some of the plurality of coupling paths CP1 to CP1 such as the coupling paths CP1 and CP2.

Reference is made to FIG. 13, which is a ninth schematic diagram of the noise suppression circuit disposed between the transmission interface and the receiving interface according to the third embodiment of the present disclosure.

It is worth noting that, as shown in FIG. 13, the plurality of noise suppression circuits SYS1 to SYSX are disposed between the transmission interface TX2 and the receiving interface RX2. The transmission interface TX2 includes the digital interface, the power transmission interface or a combination thereof.

As shown in FIG. 1 to FIG. 12, only the single noise suppression circuit SYS0, SYS1 or SYS2 is disposed. In contrast, as shown in FIG. 13, the plurality of noise suppression circuit SYS1 to SYSX are connected between the transmission interface TX2 and the receiving interface RX2.

Fourth Embodiment

Reference is made to FIG. 14 to FIG. 20, in which FIG. 14 is a schematic diagram of a noise suppression circuit disposed between a transmission interface and a receiving interface according to a fourth embodiment of the present disclosure, FIG. 15 is a S-parameter response of signals of a single port of the receiving interface (that is an antenna) when and before the noise suppression circuit of the fourth embodiment of the present disclosure is disposed between the transmission interface (that is a connector) and the receiving interface, FIG. 16 is a S-parameter response of signals transmitted from the transmission interface to the receiving interface when and before the noise suppression circuit of the fourth embodiment of the present disclosure is disposed between the transmission interface and the receiving interface, FIG. 17 is a schematic diagram showing quality of a signal that is transmitted on the transmission interface before the noise suppression circuit of the fourth embodiment of the present disclosure is disposed between the transmission interface and the receiving interface, FIG. 18 is a schematic diagram showing quality of a signal that is transmitted on the transmission interface when the noise suppression circuit of the fourth embodiment of the present disclosure is disposed between the transmission interface and the receiving interface, and FIG. 19 and FIG. 20 are an example of XY plane radiation pattern of the antenna on the receiving interface with and without the noise suppression circuit of the fourth embodiment of the present disclosure between the transmission interface and the receiving interface.

A transmission interface TX3 is the digital interface. A transmission interface connection point TX3A of the transmission interface TX3 is connected to the transmitter TCR. A transmission interface connection point TX3B at one side of the receiving interface RX3 is connected to other parts of the receiving interface RX3.

A receiving interface RX3 is a radio frequency receiving interface. A receiving interface connection point RX3A of the receiving interface RX3 is connected to an antenna ANT. A receiving interface connection point RX3B at one side of the receiving interface RX3 is connected to other parts of the receiving interface RX3.

In the fourth embodiment, a noise suppression circuit SYS3 is disposed between the transmission interface TX3 (that is the connector) and the receiving interface RX3 (that is the antenna).

The transmission interface TX3 is connected to the receiving interface RX3 through the noise suppression circuit SYS3.

In the fourth embodiment, the noise suppression circuit SYS3 mainly operates in a Wi-Fi frequency band of from 2.4 GHz to 2.5 GHz.

The noise suppression circuit SYS3 of the present disclosure includes the first noise suppression component S1, the second noise suppression component S2, the phase adjusting component S3, and the impedance components RSX1, RSX2. The first noise suppression component S1 is connected to the transmission interface TX3. The second noise suppression component S2 is connected to the receiving interface RX3. The phase adjusting component S3 is a transmission line connected between the first noise suppression component S1 and the second noise suppression component S2. For example, the impedance components RSX1, RSX2 are resistors (as terminal loads) each having a resistance of 50Ω, but the present disclosure is not limited thereto.

FIG. 15 is a S-parameter response showing changes in signals that are fed to the receiving interface connection point RX3B of the receiving interface RX3 (that is the antenna) when and before the noise suppression circuit SYS3 is disposed. As shown in FIG. 15, the noise suppression circuit SYS3 has a very small influence on an input response of the receiving interface RX3 (that is the antenna), and thus a function of the receiving interface RX3 is not affected thereby.

FIG. 16 is a S-parameter response showing changes in signals that are transmitted from the transmission interface connection point TX3B to the receiving interface connection point RX3B when and before the noise suppression circuit SYS3 is disposed. As shown in FIG. 16, more than 13 dB of noise that is caused by coupling between the transmission interface TX3 and the receiving interface RX3 in a frequency band (of from 2.46 GHz to 2.50 GHz) is significantly suppressed.

FIG. 17 and FIG. 18 are schematic diagrams showing an influence on quality of the transmission interface signal on the transmission interface TX3 by the noise suppression circuit of the fourth embodiment of the present disclosure. FIG. 17 is an eye diagram obtained (at a data transmission rate of 5 Gbps) when the transmission interface connection point TX3B is used as an input terminal, an output of the transmission interface TX3 such as the connector is used as an output terminal, and no noise suppression circuit SYS3 is not disposed between the input terminal and the output terminal. FIG. 18 is an eye diagram obtained when the transmission interface connection point TX3B is used as the input terminal, the output of the transmission interface TX3 such as the connector is used as the output terminal, and the noise suppression circuit SYS3 is disposed between the input terminal and the output terminal. As shown in FIG. 17 and FIG. 18, the noise suppression circuit has a very small influence on an input response of the transmission interface signal. Therefore, the noise suppression circuit SYS3 of the fourth embodiment of the present disclosure is a practical and effective noise suppression circuit.

The physical structures of the noise suppression circuit SYS3 of the fourth embodiment of the present disclosure whether cause additional influence or interference to the antenna ANT of the receiving interface RX3 are shown in FIG. 19 and FIG. 20.

The changes in the XY plane radiation pattern shapes that are generated on the receiving interface RX3 (that is the antenna) when and before the noise suppression circuit of the fourth embodiment of the present disclosure is disposed are shown and compared with each other in FIG. 19 and FIG. 20. The changes in the XY plane radiation pattern shape that is generated on the receiving interface RX3 (that is the antenna) before the noise suppression circuit SYS3 is disposed are marked by a solid line in FIG. 19 and FIG. 20. The changes in the XY plane radiation pattern shape that is generated when the noise suppression circuit SYS3 is disposed are marked by a dotted line in FIG. 19 and FIG. 20. As shown in FIG. 19 and FIG. 20, the noise suppression circuit SYS3 of the fourth embodiment of the present disclosure has a very small influence on the changes in the XY plane radiation pattern, and thus the function of the receiving interface RX3 (that is the antenna) is not affected thereby.

Fifth Embodiment

Reference is made to FIG. 21 to FIG. 26, in which FIG. 21 is a schematic diagram of a noise suppression circuit disposed between a transmission interface and a receiving interface according to a fifth embodiment of the present disclosure, FIG. 22 is a S-parameter response of signals of a single port of the receiving interface (that is an antenna) with and without the noise suppression circuit of the fifth embodiment of the present disclosure is disposed between the transmission interface and the receiving interface, FIG. 23 is a S-parameter response of signals transmitted from the transmission interface (that is a connector) to the receiving interface with and without the noise suppression circuit of the fifth embodiment of the present disclosure is disposed between the transmission interface and the receiving interface, FIG. 24 is a schematic diagram of the noise suppression circuit disposed between the transmission interface and the receiving interface according to the fifth embodiment of the present disclosure, FIG. 25 is a S-parameter response of signals of a single port of the receiving interface with and without the noise suppression circuit of the fifth embodiment of the present disclosure is disposed between the transmission interface and the receiving interface, and FIG. 26 is a S-parameter response of signals transmitted from the transmission interface to the receiving interface with and without the noise suppression circuit of the fifth embodiment of the present disclosure is disposed between the transmission interface and the receiving interface.

As shown in FIG. 21, in the fifth embodiment, a noise suppression circuit SYS4 of the present disclosure is disposed between a transmission interface TX4 and a receiving interface RX4. The transmission interface TX4 is the digital interface. A transmission interface connection point TX4A of the transmission interface TX4 is connected to the transmitter TCR. A transmission interface connection point TX4B at one side of the transmission interface TX4 is connected to other parts of the transmission interface TX4. The receiving interface RX4 is a radio frequency receiving interface. A receiving interface connection point RX4A of the receiving interface RX4 is connected to the antenna ANT. A receiving interface connection point RX4B at one side of the receiving interface RX4 is connected to other parts of the receiving interface RX4.

As shown in FIG. 24, in the fifth embodiment, a noise suppression circuit SYS5 of the present disclosure is disposed between the transmission interface TX4 and the receiving interface RX4. The transmission interface TX4 is the digital interface. The transmission interface connection point TX4A of the transmission interface TX4 is connected to the transmitter TCR. The transmission interface connection point TX4B at one side of the transmission interface TX4 is connected to other parts of the transmission interface TX4. The receiving interface RX4 is the radio frequency receiving interface. The receiving interface connection point RX4A of the receiving interface RX4 is connected to the antenna ANT. The receiving interface connection point RX4B at one side of the receiving interface RX4 is connected to other parts of the receiving interface RX4.

As shown in FIG. 21, the noise suppression circuit SYS4 is disposed between the transmission interface TX4 (that is the connector) and the receiving interface RX4 (that is the antenna). As shown in FIG. 24, the noise suppression circuit SYS5 is disposed between the transmission interface TX4 and the receiving interface RX4.

As shown in FIG. 21, the transmission interface TX4 is connected to the receiving interface RX4 through the noise suppression circuit SYS4.

As shown in FIG. 24, the transmission interface TX4 is connected to the receiving interface RX4 through the noise suppression circuit SYS5. The noise suppression circuit SYS5 mainly operates in the Wi-Fi frequency band of from 2.4 GHz to 2.5 GHz.

As shown in FIG. 21, the noise suppression circuit SYS4 of the present disclosure includes the first noise suppression component S1, the second noise suppression component S2 and the plurality of phase adjusting component S3. The first noise suppression component S1 of the noise suppression circuit SYS4 is connected to the transmission interface TX4. The second noise suppression component S2 of the noise suppression circuit SYS4 is connected to the receiving interface RX4. The phase adjusting component S3 of the noise suppression circuit SYS4 is a transmission line connected between the first noise suppression component S1 and the second noise suppression component S2.

As shown in FIG. 24, the noise suppression circuit SYS5 of the present disclosure includes the first noise suppression component S1, the second noise suppression component S2, the plurality of phase adjusting component S3, and the impedance components RSX1, RSX2. The first noise suppression component S1 of the noise suppression circuit SYS5 is connected to the transmission interface TX4. The second noise suppression component S2 of the noise suppression circuit SYS5 is connected to the receiving interface RX4. The phase adjusting component S3 of the noise suppression circuit SYS5 is the transmission line connected between the first noise suppression component S1 and the second noise suppression component S2. For example, the impedance components RSX1, RSX2 are resistors (as terminal loads) each having the resistance of 50Ω, but the present disclosure is not limited thereto.

FIG. 22 is a S-parameter response showing changes in signals that are fed to the receiving interface connection point RX4B of the receiving interface RX4 (that is the antenna) when and before the noise suppression circuit SYS4 is disposed. As shown in FIG. 22, the noise suppression circuit has a very small influence on an input response of the receiving interface RX4, and thus a function of the receiving interface RX4 is not affected thereby.

FIG. 23 is a S-parameter response showing changes in signals that are transmitted from the transmission interface connection point TX4B to the receiving interface connection point RX4B when and before the noise suppression circuit SYS4 is disposed. As shown in FIG. 23, more than 13 dB of noise that is caused by coupling between the transmission interface TX4 and the receiving interface RX4 in a frequency band (of from 2.45 GHz to 2.48 GHz) is significantly suppressed.

FIG. 25 is a S-parameter response showing changes in signals that are fed to the receiving interface connection point RX4B of the receiving interface RX4 (that is the antenna) when and before the noise suppression circuit SYS5 is disposed. As shown in FIG. 25, the noise suppression circuit SYS5 has a very small influence on an input response of the receiving interface RX4, and thus the function of the receiving interface RX4 is not affected thereby.

FIG. 26 is a S-parameter response showing changes in signals that are transmitted from the transmission interface connection point TX4B to the receiving interface connection point RX4B when and before the noise suppression circuit SYS5 is disposed. As shown in FIG. 26, more than 25 dB of noise that is caused by coupling between the transmission interface TX4 and the receiving interface RX4 in a frequency band (of from 2.42 GHz to 2.50 GHz) is significantly suppressed.

Sixth Embodiment

Reference is made to FIG. 27 to FIG. 30, in which FIG. 27 is a schematic diagram of a noise suppression circuit disposed between a transmission interface and a receiving interface according to a sixth embodiment of the present disclosure, FIG. 28 is a S-parameter response of signals of a single port of the receiving interface (that is an antenna) when the noise suppression circuit of the sixth embodiment of the present disclosure is disposed between the transmission interface and the receiving interface, and FIG. 29 and FIG. 30 are S-parameter response of signals transmitted from the transmission interface (that is a connector) to the receiving interface when and before the noise suppression circuit of the sixth embodiment of the present disclosure is disposed between the transmission interface and the receiving interface.

As shown in FIG. 27, in the sixth embodiment, a noise suppression circuit SYS6 of the present disclosure is disposed between the transmission interface TX5 and the receiving interface RX5. The transmission interface TX5 is the digital interface. A transmission interface connection point TX5A of the transmission interface TX5 is connected to the transmitter TCR. A a transmission interface connection point TX5B at one side of the transmission interface TX