CN118612573A - Coupler, PCB, radio frequency system and communication equipment - Google Patents

Abstract

The embodiment of the disclosure relates to the technical field of radio frequency and discloses a coupler, a PCB (printed circuit board), a radio frequency system and communication equipment. The coupler comprises a transmission main line and a coupling auxiliary line, wherein two opposite ends of the transmission main line are respectively connected with an input end and an output end, the input end is used for receiving an external input signal, the output end is used for outputting a signal, the coupling auxiliary line is used for coupling a signal on the transmission main line on the coupling auxiliary line to generate a coupling signal, the coupling auxiliary line is provided with a first end and a second end which are oppositely arranged, the first end and the second end are respectively connected with a coupling end and an isolation end, the coupling end is used for outputting the coupling signal, the coupler further comprises an attenuation circuit and a filter circuit, the attenuation circuit is connected between the first end and the coupling end, the attenuation circuit is used for attenuating the coupling signal, the filter circuit is connected between the second end and the isolation end, and the filter circuit is used for inhibiting the coupling signal. Embodiments of the present disclosure at least reduce the cost of the coupler, increase the frequency bandwidth used by the coupler, and reduce the size of the coupler.

Description

Coupler, PCB, radio frequency system and communication equipment

Technical Field

The embodiment of the disclosure relates to the technical field of radio frequency, in particular to a coupler, a PCB (printed circuit board), a radio frequency system and communication equipment.

Background

With further development of technology, requirements of mobile communication technology are higher. Couplers may be provided in mobile communication devices for separate extraction of signals, such as monitoring of power, source output power amplitude stabilization, etc.

However, current couplers have certain problems.

Disclosure of Invention

The embodiment of the disclosure provides a coupler, a PCB (printed circuit board), a radio frequency system and communication equipment, which can at least reduce the cost of the coupler, improve the frequency bandwidth used by the coupler and reduce the size of the coupler.

According to some embodiments of the present disclosure, an aspect of an embodiment of the present disclosure provides a coupler, comprising: the transmission main line, two opposite ends of the transmission main line are respectively connected with an input end and an output end, the input end is used for receiving an external input signal, and the output end is used for outputting a signal; the coupling auxiliary line is used for coupling signals on the transmission main line to generate coupling signals on the coupling auxiliary line, the coupling auxiliary line is provided with a first end and a second end which are oppositely arranged, the first end and the second end are respectively connected with a coupling end and an isolation end, and the coupling end is used for outputting the coupling signals; an attenuation circuit connected between the first end and the coupling end, the attenuation circuit being configured to attenuate the coupling signal; and the filter circuit is connected between the second end and the isolation end and is used for inhibiting the coupling signal.

In some embodiments, the attenuation circuit comprises: a first resistor connected between the first end and a metal ground; and the second resistor is connected between the first end and the coupling end.

In some embodiments, the filter circuit is a high pass filter circuit.

In some embodiments, the filtering circuit comprises: the first capacitor is connected between the second end and the first inductor, and the first inductor is connected between the first capacitor and the metal ground; the second capacitor is connected between the first capacitor and the isolation end; and the second inductor is connected between the second capacitor and the metal ground.

In some embodiments, the electrical length of the transmission main line is less than 90 °; the electrical length of the coupling sub-line is less than 90 °.

In some embodiments, the first resistor has a resistance of 10Ω -30Ω, the second resistor has a resistance of 30Ω -50Ω, the first capacitor has a capacitance of 30pf-40pF, the second capacitor has a capacitance of 0.1pF-5pF, the first inductor has an inductance of 0.1nH-1nH, and the second inductor has an inductance of 0.1nH-1nH.

In some embodiments, the coupler further comprises: the load resistor is connected between the isolation end and the metal ground, and the resistance value of the load resistor is 40 omega-60 omega.

According to some embodiments of the present disclosure, another aspect of the embodiments of the present disclosure further provides a PCB board, including the coupler according to any one of the embodiments.

According to some embodiments of the present disclosure, there is further provided a radio frequency system according to another aspect of the embodiments of the present disclosure, including the coupler according to any one of the embodiments described above.

According to some embodiments of the present disclosure, another aspect of the embodiments of the present disclosure further provides a communication device, including the coupler according to any one of the embodiments above.

The technical scheme provided by the embodiment of the disclosure has at least the following advantages:

The technical scheme of the coupler provided by the embodiment of the disclosure comprises the following steps: the coupling auxiliary line is used for coupling signals on the transmission main line to generate coupling signals on the coupling auxiliary line, the coupling auxiliary line is provided with a first end and a second end which are oppositely arranged, the first end and the second end are respectively connected with a coupling end and an isolation end, the coupling end is used for outputting the coupling signals, the coupler further comprises an attenuation circuit and a filter circuit, the attenuation circuit is connected between the first end and the coupling end, the attenuation circuit is used for attenuating the coupling signals, the filter circuit is connected between the second end and the isolation end, and the filter circuit is used for suppressing the coupling signals. The coupler of the present disclosure may be integrated on a PCB board for use, eliminating the need for separate packaging as a freestanding coupler, making the cost of the coupler of the present disclosure less. In addition, the attenuation circuit in the coupler is used for attenuating the coupling signal, so that the coupling degree of the coupler can be adjusted, the filter circuit in the coupler is used for suppressing the coupling signal, the filter circuit can suppress the coupling signal to different degrees, the fluctuation range of the coupling degree can be reduced, the coupler can meet the communication range of broadband (600 MHz-2700 MHz) of low, medium and high frequencies, and compared with the coupler which can be integrated on a PCB (printed circuit board) in the related art and has narrower frequency bandwidth, the coupler disclosed by the invention improves the frequency bandwidth of the coupler and expands the low frequency use frequency of the coupler to 600MHz. In addition, since the coupler of the present disclosure uses the attenuation circuit and the filter circuit to reduce the coupling degree fluctuation without adopting the transmission main line and the coupling sub line of a larger electrical length to reduce the coupling degree fluctuation in the related art, the electrical lengths of the transmission main line and the coupling sub line of the coupler of the present disclosure can be smaller, so that the size of the coupler of the present disclosure can be smaller.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, which are not to be construed as limiting the embodiments unless specifically indicated otherwise; in order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the conventional technology, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.

FIG. 1 is a schematic diagram of a coupler in the related art;

FIG. 2 is a graph of a simulation of return loss of a coupler according to the related art;

FIG. 3 is a graph of a simulation of the directivity of a coupler according to the related art;

FIG. 4 is a graph of a simulation of the isolation of a coupler according to the related art;

FIG. 5 is a graph showing a simulation of the coupling degree of a coupler according to the related art;

fig. 6 is a schematic structural diagram of a coupler according to an embodiment of the present disclosure;

FIG. 7 is a simulated graph of return loss of a coupler provided by an embodiment of the present disclosure;

FIG. 8 is a simulated graph of directivity of a coupler provided by embodiments of the present disclosure;

FIG. 9 is a simulation graph of the isolation of a coupler provided by embodiments of the present disclosure;

Fig. 10 is a simulation graph of coupling degree of a coupler according to an embodiment of the present disclosure.

Detailed Description

As known from the background art, the current coupler has a certain problem.

Fig. 1 is a schematic structural diagram of a coupler in the related art.

Referring to fig. 1, the coupler includes: the transmission main line 100 and the coupling auxiliary line 101, the opposite ends of the transmission main line are respectively connected with an input end 102 and an output end 103, the input end 102 is used for receiving an external input signal, and the output end 103 is used for outputting a signal. The coupling auxiliary line 101 is used for coupling the signal on the transmission main line 100 on the coupling auxiliary line 101 to generate a coupling signal, two opposite ends of the coupling auxiliary line 101 are respectively connected with a coupling end 104 and an isolation end 105, and the coupling end 104 is used for outputting the coupling signal.

The transmission main line 100 is used for transmitting a signal input from the input terminal 102 to the output terminal 103.

The input 102 is for receiving an external input signal.

The output 103 is for outputting a signal.

The coupling sub-line 101 is used to couple the signal on the transmission main line 100 on the coupling sub-line 101 to generate a coupled signal.

The coupling terminal 104 is used for outputting a coupling signal. The isolated terminal 105 is terminated with a 50 ohm resistor for absorbing signals reflected from the other terminals.

Fig. 2 is a simulation graph of return loss of a coupler according to the related art, fig. 3 is a simulation graph of directivity of a coupler according to the related art, fig. 4 is a simulation graph of isolation of a coupler according to the related art, and fig. 5 is a simulation graph of coupling of a coupler according to the related art.

Referring to fig. 2 to 5, simulation experiments are performed on the coupler to obtain simulation graphs, wherein the electrical lengths of the transmission main line 100 and the coupling auxiliary line 101 are 8 °, the even mode impedance of the coupling auxiliary line 101 is 96.9 Ω, the odd mode impedance of the coupling auxiliary line 101 is 25.6 Ω, and the center frequency of the coupler is 780MHz.

It should be noted that, in fig. 2, three curves of dB (S (3, 3)), dB (S (2, 2)) and dB (S (1, 1)) overlap, so that only one curve is shown in the figure, and it can be seen from the data shown in fig. 2 to 4 that the return loss, isolation and directivity of the coupler in the related art can satisfy the application of the coupler in the radio frequency communication system. Referring to fig. 5, the coupling degree of the coupler in the related art ranges from-10 dB to-22.3 dB, and the fluctuation range of the coupling degree is large, about 12.3dB, so that it cannot be used in the entire band of 600MHz-2700MHz in the radio frequency communication system.

In addition, in the related art, a stand-alone coupler can be adopted to realize the coupling function in the application of the radio frequency communication system, however, the stand-alone coupler has higher cost because of the need of independent packaging, and the related art also has the advantages of integrating a transmission main line and a coupling auxiliary line on a PCB (Printed Circuit Board, a printed circuit board), avoiding the installation of a single independent coupling component on the PCB, simplifying the matched discrete component with the coupling component, saving the occupied area of the PCB and reducing the cost, but the coupler with the structure has narrow use bandwidth and needs to be used in different frequency bands, and is difficult to simultaneously meet the requirements of broadband (600 MHz-2700 MHz) communication bandwidths of low, medium and high frequencies, so that the use frequency bandwidth of the coupler is smaller.

In addition, the electrical length of the coupler is related to the coupling degree fluctuation, and in order to reduce the coupling degree fluctuation, the coupler in the related art generally adopts a coupler with a power saving length of 90 ° so that the size of the coupler is larger.

In summary, the coupler in the related art has the problems of high cost, small frequency bandwidth, large size, and the like.

The embodiment of the disclosure provides a coupler, which comprises an attenuation circuit and a filter circuit, wherein the attenuation circuit is connected between a first end of a coupling auxiliary line and a coupling end, the attenuation circuit is used for attenuating a coupling signal, the filter circuit is connected between a second end of the coupling auxiliary line and an isolation end, and the filter circuit is used for inhibiting the coupling signal. The coupler does not need to be packaged independently like a stand-alone coupler, so that the cost of the coupler can be reduced. The attenuation circuit in the coupler is used for attenuating the coupling signals, so that the coupling degree of the coupler can be adjusted, the filter circuit in the coupler is used for suppressing the coupling signals, the filter circuit can suppress the coupling signals to different degrees, the fluctuation range of the coupling degree can be reduced, the coupler can meet the communication range of broadband (600 MHz-2700 MHz) of low, medium and high frequencies, and compared with the coupler which can be integrated on a PCB (printed circuit board) in the related art but has narrower frequency bandwidth, the frequency bandwidth of the coupler is improved, and the low-frequency use frequency of the coupler is expanded to 600MHz. Further, since the coupler of the present disclosure uses the attenuation circuit and the filter circuit to reduce the coupling degree fluctuation without employing the transmission main line and the coupling sub line of a larger electrical length to reduce the coupling degree fluctuation in the related art, the electrical lengths of the transmission main line and the coupling sub line of the coupler of the present disclosure can be smaller, so that the size of the coupler of the present disclosure can be smaller.

Embodiments of the present disclosure will be described in detail below with reference to the attached drawings. However, those of ordinary skill in the art will understand that in the various embodiments of the present disclosure, numerous technical details have been set forth in order to provide a better understanding of the present disclosure. The technical solutions claimed in the present disclosure can be implemented without these technical details and with various changes and modifications based on the following embodiments.

Fig. 6 is a schematic structural diagram of a coupler according to an embodiment of the present disclosure.

Referring to fig. 6, the coupler includes: the transmission main line 200 and the coupling auxiliary line 201, two opposite ends of the transmission main line 200 are respectively connected with an input end 202 and an output end 203, the input end 202 is used for receiving an external input signal, and the output end 203 is used for outputting a signal. The coupling auxiliary line 201 is used for coupling the signal on the transmission main line 200 on the coupling auxiliary line 201 to generate a coupling signal, the coupling auxiliary line 201 is provided with a first end 211 and a second end 221 which are oppositely arranged, the first end 211 and the second end 221 are respectively connected with a coupling end 204 and an isolation end 205, and the coupling end 204 is used for outputting the coupling signal. The coupler further comprises an attenuation circuit 206 and a filter circuit 207, the attenuation circuit 206 being connected between the first end 211 and the coupling end 204, the attenuation circuit 206 being adapted to attenuate the coupled signal. The filter circuit 207 is connected between the second terminal 221 and the isolation terminal 205, and the filter circuit 207 is configured to suppress the coupling signal.

It should be noted that, in fig. 6, in order to show the connection situation inside the coupler, the transmission main line 200 is connected to the input end 202 and the transmission main line 200 is connected to the output end 203, and the coupling auxiliary line 201 is connected to the coupling end 204 and the coupling auxiliary line 201 is connected to the isolation end 205, respectively, so that in practical application, the transmission main line 200 may be directly connected to the input end 202 and the output end 203, and the coupling auxiliary line 201 may also be directly connected to the coupling end 204 and the isolation end 205. TermG1, termG, termG, termG in fig. 6 represent an input 202, an output 203, a coupling 204, and an isolation 205, respectively.

The transmission main line 200 is used for transmitting a signal input from the input terminal 202 to the output terminal 203.

The input 202 is for receiving an external input signal.

The output terminal 203 is for outputting a signal.

The coupling sub-line 201 is used to couple the signal on the transmission main line 200 on the coupling sub-line 201 to generate a coupled signal.

The first end 211 is used for connecting the coupling auxiliary line 201 and the coupling end 204.

The second end 221 is used to connect the coupling sub-line 201 with the isolation end 205.

The coupling terminal 204 is used for outputting a coupling signal.

In some embodiments, the coupler further comprises: and the load resistor is connected between the isolation end and the metal ground, and the isolation end is connected with the load resistor and is used for absorbing signals reflected from other ends. The resistance of the load resistor may be 40 Ω -60 Ω, for example 40 Ω, 43 Ω, 46 Ω, 49 Ω, 50 Ω, 52 Ω, 55 Ω, 58 Ω, or 60 Ω, etc. It is understood that the resistance of the load resistor may be other values.

The attenuation circuit 206 is connected between the first end 211 and the coupling end 204, and the attenuation circuit 206 is used for attenuating the coupling signal, so that the coupling degree of the coupling end 204 can be adjusted.

In some embodiments, the attenuation circuit 206 includes: a first resistor 216 and a second resistor 226, the first resistor 216 being connected between the first end 211 and the metal ground 208, the second resistor 226 being connected between the first end 211 and the coupling end 204.

The first resistor 216 and the second resistor 226 form an L-shaped attenuation circuit for attenuating the coupled signal. The L-shaped attenuation circuit is composed of a first resistor 216 and a second resistor 226, has a simple structure, and is beneficial to reducing the manufacturing cost of the coupler.

Metal ground 208 is a "logical ground". The transmission and information conversion of the current of each stage in the circuit requires a reference potential which can prevent the invasion of external electromagnetic field signals, and the potential is called logic ground in the circuit design.

In some other examples, the attenuation circuit 206 may also be a T-type attenuation circuit, pi-type attenuation circuit, or the like.

The filter circuit 207 is connected between the second terminal 221 and the isolation terminal 205, the filter circuit 207 is configured to suppress the coupling signal, and the filter circuit 207 may suppress the coupling signal to different degrees, so that the fluctuation range of the coupling degree may be reduced.

In some embodiments, the filter circuit 207 may be a high pass filter circuit. In order to enable the coupling degree fluctuation of the coupler to meet the broadband (600 MHz-2700 MHz) communication bandwidths of low, medium and high frequencies, the coupling signals with the frequencies of 600MHz-2700MHz need to be suppressed to different degrees by using a high-frequency filter circuit, so that the coupling degree fluctuation range of the coupler can be reduced.

It will be appreciated that in other embodiments, the filter circuit 207 may also be a low pass filter circuit, a band reject filter circuit, a band pass filter circuit, or the like, to achieve varying degrees of rejection of the coupled signal at 600MHz-2700MHz frequencies.

In some embodiments, the filter circuit 207 includes: the first capacitor 217 and the first inductor 227 are sequentially connected, the first capacitor 217 is connected between the second end 221 and the first inductor 227, and the first inductor 227 is connected between the first capacitor 217 and the metal ground 208; the filter circuit 207 further comprises a second capacitor 237 and a second inductor 247, the second capacitor 237 being connected between the first capacitor 217 and the isolated terminal 205, the second inductor 247 being connected between the second capacitor 237 and the metal ground 208.

The first capacitor 217, the first inductor 227, the second capacitor 237 and the second inductor 247 together form a dual L-shaped filter circuit for suppressing the coupling signal to different degrees, so that the fluctuation range of the coupling degree can be reduced.

In other examples, the filter circuit 207 may be an L-type filter circuit, a T-type filter circuit, a pi-type filter circuit, or the like.

In some embodiments, the electrical length of the transmission main line 200 may be less than 90 °, for example 1 °,2 °,3 °,4 °,5 °,6 °,7 °, 8 °, 15 °,20 °, 25 °, 30 °,35 °, 40 °, 45 °, 50 °, 55 °,60 °, 65 °, 70 °, 75 °, 80 °, 85 °, 89 °, etc.; the electrical length of the coupling sub-line 201 may be less than 90 °, for example 1 °,2 °,3 °,4 °,5 °,6 °,7 °, 8 °, 15 °,20 °, 25 °, 30 °,35 °, 40 °, 45 °, 50 °, 55 °,60 °, 65 °, 70 °, 75 °, 80 °, 85 °, 89 °, etc. The electric lengths of the transmission main line 200 and the coupling sub line 201 within this range may be smaller and may be smaller than those of the transmission main line and the coupling sub line having an electric length of 90 ° in the related art, which is advantageous in reducing the size of the coupler.

In some embodiments, the impedance of the input 202 may be 40Ω -60deg.OMEGA, such as 40Ω, 43Ω, 46 Ω, 49Ω,50Ω, 52Ω, 55Ω, 58Ω, 60deg.OMEGA, or the like; the impedance of the output 203 may be 40 Ω -60 Ω, such as 40 Ω, 43 Ω, 46 Ω, 49 Ω,50 Ω, 52 Ω, 55 Ω, 58 Ω, or 60 Ω, etc.; the impedance of the coupling end 204 may be 40Ω -60deg.OMEGA, such as 40Ω, 43Ω, 49Ω,50Ω, 52Ω, 55Ω, 58Ω, 60deg.OMEGA, etc.; the impedance of the isolated end 205 may be 40 Ω -60 Ω, such as 40 Ω, 43 Ω, 46 Ω, 49 Ω,50 Ω, 52 Ω, 55 Ω, 58 Ω, or 60 Ω, etc. When the impedance of the input end 202 is 50Ω, the impedance of the output end 203 is 50Ω, the impedance of the coupling end 204 is 50Ω, and the impedance of the isolation end 205 is 50Ω, the simulation is performed according to the characteristic impedance of 50Ω, so that the coupler is directly connected with the corresponding module without excessive debugging when being matched with a radio frequency device or the like, thereby saving a great amount of research and development costs such as manpower and material resources, improving the working efficiency and shortening the research and development period of the coupler.

The above values are only examples, and it is understood that the impedances of the input end 202, the output end 203, the coupling end 204, and the isolation end 205 may be other values, and the impedances of the input end 202, the output end 203, the coupling end 204, and the isolation end 205 may be adaptively adjusted by an operator according to practical situations.

In some embodiments, the first resistor 216 may have a resistance of 10Ω -30Ω, such as 10Ω, 13Ω, 16Ω, 19Ω, 22Ω, 25Ω, 28Ω, 30Ω, or the like. The second resistor 226 may have a resistance value of 30Ω -50Ω, for example 30Ω, 33Ω, 36Ω, 39Ω, 42Ω, 43Ω, 45Ω, 48Ω, 50Ω, or the like. The capacitance value of the first capacitor 217 may be 30pF-40pF, for example 30pF, 32pF, 33pF, 34pF, 36pF, 38pF or 40pF, etc. The capacitance value of the second capacitor 237 may be 0.1pF-5pF, such as 0.1pF, 0.5pF, 1pF, 2pF, 3pF, 4pF, 5pF, etc. The first inductor 227 may have an inductance value of 0.1nH-1nH, for example, 0.1nH, 0.3nH, 0.6nH, 0.9nH, or 1nH. The second inductance 247 has an inductance value of 0.1nH-1nH, for example, 0.1nH, 0.3nH, 0.6nH, 0.9nH, or 1nH.

The above values are merely examples, and it is understood that the values of the first resistor 216, the second resistor 226, the first capacitor 217, the second capacitor 237, the first inductor 227, and the second inductor 247 may be other values, and the values of the first resistor 216, the second resistor 226, the first capacitor 217, the second capacitor 237, the first inductor 227, and the second inductor 247 may be adaptively adjusted by an operator according to practical situations.

Fig. 7 is a simulation graph of return loss of a coupler according to an embodiment of the present disclosure, fig. 8 is a simulation graph of directivity of a coupler according to an embodiment of the present disclosure, fig. 9 is a simulation graph of isolation of a coupler according to an embodiment of the present disclosure, and fig. 10 is a simulation graph of coupling of a coupler according to an embodiment of the present disclosure. In fig. 7, a curve a represents a simulation curve of dB (S (3, 3)), a curve B represents a simulation curve of dB (S (2, 2)), a curve C represents a simulation curve of dB (S (1, 1)), dB (S (3, 3)) is a simulation curve of an isolation terminal, dB (S (2, 2)) is an isolation curve of an output terminal, and dB (S (1, 1)) is an isolation curve of an input terminal.

Referring to fig. 6 to 10 in combination, in a specific example, the electrical lengths of the transmission main line 200 and the coupling auxiliary line 201 may be 8 °, the resistance of the first resistor 216 may be 16Ω, the resistance of the second resistor 226 may be 43Ω, the capacitance of the first capacitor 217 may be 33pF, the capacitance of the second capacitor 237 may be 0.5pF, the inductance of the first inductor 227 may be 0.6nH, the inductance of the second inductor 247 may be 0.6nH, and the center frequency of the coupling auxiliary line 201 may be 780MHz.

According to the simulation curves of fig. 7 to 10, it can be found that the return loss and directivity of the coupler in the frequency of 600MHz-2700MHz in the embodiment of the disclosure are less than-20 dB, so as to meet the performance requirements of radio frequency communication. The coupling degree of the coupler in the frequency of 600MHz-2700MHz is within the range of-23.6 dB to-27.8 dB, the fluctuation range of the coupling degree is 4.2dB, and the fluctuation range of the coupling degree is smaller and is far smaller than the fluctuation range of the coupling degree of the coupler in the related technology, which is 12.3 dB.

In the embodiment of the coupler, the coupler comprises the attenuation circuit and the filter circuit, the attenuation circuit is used for attenuating the coupling signals, so that the coupling degree of the coupler can be adjusted, the filter circuit in the coupler is used for suppressing the coupling signals, the filter circuit can suppress the coupling signals to different degrees, and the fluctuation range of the coupling degree can be reduced, so that the coupler can meet the communication range of broadband (600 MHz-2700 MHz) of low, medium and high frequencies, and compared with the coupler in the related art, the use frequency bandwidth of the coupler is improved, and the low-frequency use frequency of the coupler is expanded to 600MHz. In addition, the transmission main line and the coupling sub line of a larger electrical length need not be used in the related art to reduce the coupling degree fluctuation, and thus the electrical lengths of the transmission main line and the coupling sub line of the coupler of the present disclosure can be smaller, which is advantageous in reducing the size of the coupler.

Correspondingly, another embodiment of the disclosure further provides a PCB board including the coupler in any of the above embodiments. The same or corresponding parts as those of the previous embodiment may be referred to for corresponding description of the previous embodiment, and detailed description thereof will be omitted.

The PCB is a basic material for supporting and connecting electronic components, and has the functions of providing mechanical support for electronic equipment, improving electrical connection between the electronic components, managing arrangement and layout of the electronic components, promoting automation of production flow and the like.

Accordingly, another embodiment of the disclosure also provides a radio frequency system including the coupler of any one of the above embodiments. The same or corresponding parts as those of the previous embodiment may be referred to for corresponding description of the previous embodiment, and detailed description thereof will be omitted.

The Radio Frequency system refers to a system for processing Radio Frequency (RF) signals, and includes a transmitting end and a receiving end, which are used for wireless communication, radar, remote sensing, and other applications.

Accordingly, another embodiment of the present disclosure also provides a communication device including the coupler of any one of the above embodiments. The same or corresponding parts as those of the previous embodiment may be referred to for corresponding description of the previous embodiment, and detailed description thereof will be omitted.

The communication device may be a handheld device, an in-vehicle device, a wearable device, a computing device, or other processing device connected to a wireless modem, as well as various forms of User Equipment (UE) (e.g., a cell phone), a Mobile Station (MS), and so forth.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of implementing the disclosure, and that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and the scope of the disclosure should therefore be assessed as that of the appended claims.

Claims (10)

1. A kind of coupler, characterized by comprising the following steps:

the transmission main line, two opposite ends of the transmission main line are respectively connected with an input end and an output end, the input end is used for receiving an external input signal, and the output end is used for outputting a signal;

The coupling auxiliary line is used for coupling signals on the transmission main line to generate coupling signals on the coupling auxiliary line, the coupling auxiliary line is provided with a first end and a second end which are oppositely arranged, the first end and the second end are respectively connected with a coupling end and an isolation end, and the coupling end is used for outputting the coupling signals;

An attenuation circuit connected between the first end and the coupling end, the attenuation circuit being configured to attenuate the coupling signal;

And the filter circuit is connected between the second end and the isolation end and is used for inhibiting the coupling signal.

2. The coupler of claim 1, wherein the attenuation circuit comprises:

a first resistor connected between the first end and a metal ground;

And the second resistor is connected between the first end and the coupling end.

3. The coupler of claim 2, wherein the filter circuit is a high pass filter circuit.

4. A coupler according to claim 3, wherein the filter circuit comprises:

The first capacitor is connected between the second end and the first inductor, and the first inductor is connected between the first capacitor and the metal ground;

The second capacitor is connected between the first capacitor and the isolation end;

and the second inductor is connected between the second capacitor and the metal ground.

5. The coupler of claim 4, wherein the electrical length of the transmission main line is less than 90 °; the electrical length of the coupling sub-line is less than 90 °.

6. The coupler of claim 5, wherein the first resistor has a resistance of 10Ω -30Ω, the second resistor has a resistance of 30Ω -50Ω, the first capacitor has a capacitance of 30pf-40pF, the second capacitor has a capacitance of 0.1pF-5pF, the first inductor has an inductance of 0.1nH-1nH, and the second inductor has an inductance of 0.1nH-1nH.

7. The coupler of claim 1, wherein the coupler further comprises: the load resistor is connected between the isolation end and the metal ground, and the resistance value of the load resistor is 40 omega-60 omega.

8. A PCB board comprising a coupler according to any one of claims 1-7.

9. A radio frequency system comprising a coupler as claimed in any one of claims 1 to 7.

10. A communication device comprising a radio frequency system as claimed in any one of claims 1-7.