WO2023273391A1

WO2023273391A1 - Filtering-coupling integrated circuit, method, and device

Info

Publication number: WO2023273391A1
Application number: PCT/CN2022/079423
Authority: WO
Inventors: 卢曰海; 卢斌斌; 宋吉伟
Original assignee: 华为技术有限公司
Priority date: 2021-06-30
Filing date: 2022-03-04
Publication date: 2023-01-05
Also published as: CN115549628A

Abstract

Provided are a filtering-coupling integrated circuit (100), a method, and a device. The filtering-coupling integrated circuit (100) is used to perform low-pass filtering on a first signal inputted from an input end (10) so as to output a second signal from an output end (11), and is also used to perform coupling sampling on the first signal so as to output a third signal from a coupling end (12). By multiplexing a low-pass filtering branch, a main signal line of a coupler is moved to the low-pass filtering branch and filtering and coupling functions are combined on one device, thus reducing the area of a single board and reducing device insertion loss.

Description

Filter coupling integration circuit, method and device

This application claims the priority of the Chinese patent application filed with the State Intellectual Property Office of China on June 30, 2021, with application number 202110746880.7, and the application name is "Filtering and coupling integration circuit and method, device", the entire content of which is incorporated by reference In this application.

technical field

The present application relates to the field of electronic technology, and in particular to a filter-coupling integration circuit, method, and device.

Background technique

In some electronic devices, both filtering and coupling functions are required. For example, with the continuous evolution of WIFI technology, it is hoped that the access point (access point, AP) will output higher power to improve the coverage performance of the AP. A block diagram of an AP dual-frequency dual-feed system as shown in FIG. 1 usually introduces a digital pre-distortion (Digital pre-distortion, DPD) function in the entire WIFI system. Optionally, a coupler is added in the link to couple the power output by the power amplifier (power amplifier, PA) to the baseband for pre-distortion processing, so as to offset the distortion caused by the PA operating in the nonlinear region. Wherein, the PA is located in the front end module (FEM). And in order to reduce the out-of-band spurs of the PA so that the out-of-band spurs meet the requirements of the air interface index, a filter is usually added at the output end of the PA. The introduction of filters and couplers will increase the area of the single board. On the other hand, it will increase the insertion loss of the link, thereby reducing the output power of the AP and increasing the cost of the entire system.

As shown in FIG. 2 and FIG. 3 , couplers and filters are introduced into the electronic equipment, however, the introduced couplers and filters increase the area of the single board and increase the insertion loss of the electronic equipment.

At present, the most commonly used method of combining coupling and filtering is to adopt the coaxial cavity structure as shown in Fig. 4 . The principle of the coaxial cavity structure is that by adjusting the band-pass frequency of the tuning rod cavity, the cavity can be equivalent to an inductance in parallel with a capacitor, thereby forming a resonant stage, realizing the microwave filtering function, and adding a coupling print in the filter Printed circuit board (PCB). This kind of coaxial cavity is widely used in high-power applications such as base stations. However, the structure of this cavity is relatively large, the cost is high, and the complexity is high. It is not suitable for low-power scenarios such as APs.

In view of this, how to reduce the area of the single board and the insertion loss of the electronic equipment after introducing filtering and coupling functions into the electronic equipment is a problem to be solved in this application.

Contents of the invention

The present application provides a filter-coupling integration circuit, method, and equipment, so as to reduce the single board area of the circuit and reduce the insertion loss of electronic equipment.

In the first aspect, a filter-coupling circuit is provided, which is used to low-pass filter the first signal input from the input terminal 10 to output the second signal from the output terminal 11, and is also used to filter the first signal Coupled sampling is performed to output a third signal from the coupled terminal 12 . In this aspect, by multiplexing the low-pass filtering branch, the main signal line of the coupler is moved to the low-pass filtering branch, and the filtering and coupling functions are combined on one device, which reduces the board area and device insertion damage.

In a possible implementation, the filter coupling circuit includes: a first capacitor C2, a first inductor L2, a second capacitor C3, and a second inductor L3, wherein: the first terminal C21 of the first capacitor C2 The ground and the second terminal C22 are respectively connected to the input terminal 10 and the first terminal L21 of the first inductor L2; the first terminal C31 of the second capacitor C3 is grounded, and the second terminal C32 is respectively connected to the output terminal 11. The second end L22 of the first inductance L2 is connected; and the second inductance L3 is coupled to the first inductance L2, and the first end L31 of the second inductance L3 is connected to the coupling end 12, The second end L32 is connected to the load end 13 .

In yet another possible implementation, one pole of the first capacitor C2 corresponding to the second end C22 is the first microstrip line region C2a, one pole corresponding to the first end C21 is grounded, and the first The microstrip line region C2a is coupled with the ground to form a capacitor.

In yet another possible implementation, the first microstrip line region C2a is strip-shaped.

In yet another possible implementation, one pole of the first capacitor C2 corresponding to the second terminal C22 is the second microstrip line region C2d, and one pole corresponding to the first terminal C21 is a third pole connected to the ground. The microstrip line region C2e, the second microstrip line region C2d is coupled with the third microstrip line region C2e to form a capacitor.

In yet another possible implementation, both the second microstrip line region C2d and the third microstrip line region C2e are elongated.

In yet another possible implementation, one pole of the second capacitor C3 corresponding to the second end C32 is the fourth microstrip line region C3a, one pole corresponding to the first end C31 is the ground, and the fourth The microstrip line region C3a is coupled with the ground to form a capacitor.

In yet another possible implementation, the fourth microstrip line region C3a is strip-shaped.

In yet another possible implementation, one pole of the second capacitor C3 corresponding to the second terminal C32 is the fifth microstrip line region C3d, and one pole corresponding to the first terminal C31 is connected to the sixth microstrip line region C3d. The microstrip line region C3e, the fifth microstrip line region C3d is coupled with the sixth microstrip line region C3e to form a capacitor.

In yet another possible implementation, both the fifth microstrip line region C3d and the sixth microstrip line region C3e are elongated.

In yet another possible implementation, the first inductance L2 is the seventh microstrip line region L2a, and the second inductance L3 is the eighth microstrip line region L3a.

In yet another possible implementation, the seventh microstrip line region L2a is in the shape of a strip, "u" or "v". In this implementation, according to the needs of the circuit layout, the seventh microstrip line region L2a can be strip-shaped, "u"-shaped or "v-shaped", so as to meet the needs of the seventh microstrip line region L2a and the eighth microstrip line region L3a. Coupling and/or isolation requirements between.

In yet another possible implementation, the width and/or length of the gap between the seventh microstrip line region L2a and the eighth microstrip line region L3a is set to be the same as that of the second inductance L2 and the The required coupling degree between the third inductance L3 is positively correlated, and/or, the gap width and/or length between the seventh microstrip line region L2a and the eighth microstrip line region L3a is set as It is positively correlated with the isolation required between the second inductance L2 and the third inductance L3; the distance between the input terminal 10 and the coupling terminal 12 on the eighth microstrip line region L3a is set as It is inversely correlated with the coupling degree required between the second inductance L2 and the third inductance L3, and/or, the input terminal 10 is connected to the load terminal 13 on the eighth microstrip line region L3a The distance therebetween is set to be inversely correlated with the required isolation between the second inductor L2 and the third inductor L3. In this implementation, the width and/or length of the gap between the seventh microstrip line region L2a and the eighth microstrip line region L3a is reasonably set to meet the requirements of the seventh microstrip line region L2a and the eighth microstrip line region L3a Coupling and/or isolation requirements between.

In yet another possible implementation, the eighth microstrip line region L3a is in the shape of "h", "n", or "7". In this implementation, according to the needs of circuit layout, the eighth microstrip line area L3a can be in the shape of "h", "n", or "7", so as to meet the needs of the seventh microstrip line area L2a and the eighth microstrip line. Coupling and/or isolation requirements between regions L3a.

In yet another possible implementation, when one pole of the first capacitor C2 corresponding to the second terminal C22 is the first microstrip line region C2a, and one pole corresponding to the first terminal C21 is grounded, the first One pole of the second capacitor C3 corresponding to the second end C32 is the fourth microstrip line region C3a, one pole corresponding to the first end C31 is the ground, the first microstrip line region C2a and the fourth microstrip line region C3a is located on the first side D1 of the seventh microstrip line region L2a, and the eighth microstrip line region L3a is located on the second side D2 of the seventh microstrip line region L2a; or the eighth microstrip line The region L3a, the first microstrip line region C2a and the fourth microstrip line region C3a are all located on the first side D1 of the seventh microstrip line region L2a.

In yet another possible implementation, when the pole corresponding to the second end C22 of the first capacitor C2 is the second microstrip line region C2d, and the pole corresponding to the first end C21 is the first pole connected to the ground, Three microstrip line areas C2e, one pole of the second capacitor C3 corresponding to the second end C32 is the fifth microstrip line area C3d, and one pole corresponding to the first end C31 is the sixth microstrip line connected to the ground line region C3e, the second microstrip line region C2d, the third microstrip line region C2e, the fifth microstrip line region C3d, and the sixth microstrip line region C3e are located in the seventh microstrip The first side D1 of the line region L2a, the eighth microstrip line region L3a is located at the second side D2 of the seventh microstrip line region L2a; or the second microstrip line region C2d, the third microstrip line region The strip line region C2e, the fifth microstrip line region C3d, the sixth microstrip line region C3e and the eighth microstrip line region L3a are all located on the first side D1 of the seventh microstrip line region L2a .

In the second aspect, a filter coupling circuit is provided, including: a high-pass filter circuit, a filter-coupling integration circuit as described in the first aspect or any implementation of the first aspect; the high-pass filter circuit is used for the The filtering, coupling and unifying circuit provides the high-pass filtered signal, or performs high-pass filtering on the signal output by the filtering, coupling and unifying circuit.

In a possible implementation, the filter coupling circuit further includes: a low-pass filter circuit, an input end of the low-pass filter circuit is connected to the output end 11 of the filter coupling circuit.

In yet another possible implementation, the high-pass filter circuit is an N-order high-pass filter circuit, where N>=2.

In the third aspect, there is provided a filter-coupling method, the method is applied to the filter-coupling circuit described in the first aspect or any implementation of the first aspect, and the method includes: The input first signal is low-pass filtered to output the second signal from the output terminal 11 ; and the first signal is coupled and sampled to output the third signal from the coupling terminal 12 .

In a fourth aspect, an electronic device is provided, including the filter-coupling integration circuit described in the first aspect or any implementation of the first aspect.

In a fifth aspect, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the method described in the third aspect is implemented.

In a sixth aspect, a computer program product is provided, which is used to realize the method described in the third aspect when executed on a computing device.

Description of drawings

Figure 1 is a block diagram of an example AP dual-frequency dual-feed system;

FIG. 2 is a schematic diagram of a circuit structure in which an existing filter and a coupler are separately arranged;

FIG. 3 is a schematic diagram of another existing circuit structure in which a filter and a coupler are separately arranged;

FIG. 4 is a schematic structural diagram of the existing coupling-filtering integration realized through the coaxial cavity structure;

FIG. 5 is a schematic structural diagram of a filter-coupling integration circuit provided by an embodiment of the present application;

FIG. 6 is a schematic diagram of a circuit structure of a filter-coupling integration circuit provided by an embodiment of the present application;

FIG. 7A is a schematic structural diagram of a filter coupling circuit provided by an embodiment of the present application;

FIG. 7B is a schematic structural diagram of another filter coupling circuit provided by the embodiment of the present application;

FIG. 8 is a schematic circuit structure diagram of a filter coupling circuit provided in an embodiment of the present application;

FIG. 9 is a schematic circuit structure diagram of another filter coupling circuit provided in the embodiment of the present application;

FIG. 10 is a schematic circuit structure diagram of a filter coupling circuit provided in an embodiment of the present application;

FIG. 11 is a schematic circuit structure diagram of another filter coupling circuit provided by the embodiment of the present application;

FIG. 12 is a schematic diagram of a microstrip line structure of a filter coupling circuit provided in an embodiment of the present application;

FIG. 13 is a schematic diagram of a capacitor realized by using a microstrip line;

FIG. 14 is a schematic diagram of an inductor realized by using a microstrip line;

FIG. 15 is a schematic diagram of another microstrip line structure of the filter coupling circuit provided by the embodiment of the present application;

FIG. 16 is a schematic diagram of another microstrip line structure of the filter coupling circuit provided by the embodiment of the present application;

FIG. 17 is a schematic diagram of a simulation result of a filter coupling circuit provided in an embodiment of the present application;

FIG. 18 is a schematic flowchart of a coupling filtering method provided by an embodiment of the present application.

detailed description

Embodiments of the present application are described below with reference to the drawings in the embodiments of the present application.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail in order to avoid obscuring the application.

Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "an example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present application. In at least one embodiment. Thus, appearances of the phrases "one embodiment," "an embodiment," "an example," or "example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, particular features, structures or characteristics may be combined in any suitable combination and/or subcombination in one or more embodiments or examples. Furthermore, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the description of this application, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", The orientation or positional relationship indicated by "low", "inner", "outer" and so on is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device Or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of the present application.

Example

As shown in FIG. 5 , it is a schematic structural diagram of a filter-coupling circuit provided by the embodiment of the present application. The circuit 100 is used to low-pass filter the first signal input from the input terminal 10 to output the first signal from the output terminal 11. two signals, and is also used to couple and sample the first signal, so as to output the third signal from the coupling terminal 12 .

For example, the first signal may be the signal output by the PA, and the circuit is used to couple the power output by the PA to the baseband for pre-distortion processing, so as to offset the distortion caused by the PA working in the nonlinear region, and to The signal is low-pass filtered to reduce the out-of-band spurs of the PA.

As shown in FIG. 6 , it is a schematic diagram of a circuit structure of a filter coupling integration circuit provided by an embodiment of the present application. The filter coupling integration circuit 100 includes: a first capacitor C2, a first inductor L2, a second capacitor C3 and a first capacitor C3. Two inductors L3, where:

The first terminal C21 of the first capacitor C2 is grounded, and the second terminal C22 is respectively connected to the input terminal 10 and the first terminal L21 of the first inductor L2;

The first terminal C31 of the second capacitor C3 is grounded, and the second terminal C32 is respectively connected to the output terminal 11 and the second terminal L22 of the first inductor L2;

The second inductance L3 is coupled to the first inductance L2 , the first end L31 of the second inductance L3 is connected to the coupling end 12 , and the second end L32 is connected to the load end 13 . Wherein, the load terminal 13 is generally connected to a matched load, such as a 50Ω resistor.

Utilizing the characteristic that high frequencies are easier to pass through capacitors, the first capacitor C2, the first inductor L2 and the second capacitor C3 in the circuit 100 are used to low-pass filter the first signal to obtain a second signal, which is passed through the output terminal 11 output the second signal. By changing the values of the first capacitor C2, the first inductor L2 and the second capacitor C3, the high-frequency part of the out-of-band spurs of the PA can be suppressed, thereby realizing the function of low-pass filtering.

The first signal generates alternating magnetic flux through the first inductor L2, so that the second inductor L3 induces a voltage, so that the first inductor L2 and the second inductor L3 realize the coupling function through space or physically, that is, the first inductor in the circuit 100 An inductor L2 and a second inductor L3 are used for coupling and sampling the first signal. The degree of isolation and coupling of the filter coupling circuit can be changed by changing the tightness of coupling such as the distance between the first inductor L2 and the second inductor L3.

In this embodiment, by multiplexing the low-pass filter branch, the main signal line of the coupler is moved to the low-pass filter branch, and the filtering and coupling functions are combined on one device, which reduces the area of the single board and reduces the device plug-in. damage.

The filter-coupling circuit 100 mentioned above may be a single circuit, or a sub-circuit in a certain circuit. For example, the filter-coupling circuit 100 described above may be a sub-circuit in the filter-coupling circuit described below. The filter coupling circuit may also include more sub-circuits.

As shown in FIG. 7A , it is a schematic structural diagram of a filter coupling circuit provided by an embodiment of the present application. The filter coupling circuit 200 includes the above-mentioned low-pass filter coupling circuit 100 and also includes a high-pass filter circuit 201 . Optionally, in FIG. 7A , the high-pass filter circuit 201 is respectively connected to the input end 20 of the filter coupling circuit 200 and the input end 10 of the low-pass filter coupling circuit 100 . The high-pass filter circuit 201 is used to provide a high-pass filtered signal for the filter coupling circuit. Optionally, the high-pass filter circuit 201 is configured to high-pass filter the fourth signal received from the input terminal 20 of the filter coupling circuit 200 to obtain the first signal, which is input to the low-pass filter coupling circuit 100 from the input terminal 10; The low-pass filtering and coupling circuit 100 is used for performing low-pass filtering on the first signal, outputting the second signal through the output terminal 11, and also performing coupling sampling on the first signal, so as to output the sampled first signal from the coupling terminal 12. Three signals. The coupling terminal 12 can be connected to other circuits.

As shown in FIG. 7B , which is a schematic structural diagram of another filter coupling circuit provided by the embodiment of the present application, the filter coupling circuit 300 includes a low-pass filter coupling circuit 100 and a high-pass filter circuit 301 . Optionally, in FIG. 7B , the high-pass filter circuit 301 is respectively connected to the output terminal 11 of the filter coupling circuit 100 and the output terminal 30 of the filter coupling circuit 300 . The high-pass filter circuit 301 performs high-pass filter for the output signal of the filter coupling circuit 100 . Optionally, the low-pass filter coupling-into-one circuit 100 is used to low-pass filter the first signal input from the input terminal 10 to output the second signal from the output terminal 11 to the high-pass filter circuit 301, and is also used to filter the first signal The signal is coupled and sampled to output a third signal from the coupling end 12; the high-pass filter circuit 301 is used to perform high-pass filtering on the second signal output by the output end 11 of the low-pass filter coupling and integration circuit 100, and pass the output of the filter coupling circuit 300 Terminal 30 outputs the fifth signal.

In this embodiment, by multiplexing the low-pass filter branch, the main signal line of the coupler is moved to the low-pass filter branch, and the filtering and coupling functions are combined on one device, which reduces the area of the single board and reduces the device plug-in. damage. The filter coupling circuit as a whole realizes the function of band-pass filtering and also realizes the function of coupling.

The specific circuit implementation of the filter coupling circuit is described below:

Corresponding to the structure shown in FIG. 7A , as shown in FIG. 8 , it is a schematic diagram of the circuit structure of a filter coupling circuit provided by the embodiment of the present application. The filter coupling circuit 800 includes a high-pass filter circuit 201 and a low-pass filter coupling circuit 100 . The high-pass filter circuit 201 is respectively connected to the input end 20 of the filter coupling circuit and the input end 10 of the low-pass filter coupling circuit 100 .

Wherein, the high-pass filter circuit 201 includes a first high-pass filter circuit, and the first high-pass filter circuit includes a second inductor L1 and a third capacitor C1. Wherein: the first terminal L11 of the second inductor L1 is connected to the second terminal C12 of the third capacitor C1, and the second terminal L12 of the second inductor L1 is respectively connected to the input terminal 20 of the filter coupling circuit and the low-pass filter coupling circuit 100 The first terminal C11 of the third capacitor C1 is connected to the ground, and the second terminal C12 of the third capacitor C1 is connected to the first terminal L11 of the second inductor L1.

The working principle of the first high-pass filter circuit is: the third signal flows in from the input end 20 of the filter coupling circuit. Utilizing the characteristics of capacitance through AC and inductance against AC, the third inductance L1 and the third capacitor C1 are equivalent to an inductance, and low frequencies are easier to pass through the inductance. The fourth signal is subjected to high-pass filtering to obtain the first signal. By changing the values of the third inductor L1 and the third capacitor C1, the low-frequency part of the out-of-band spurs of the PA can be suppressed, thereby realizing the function of high-pass filtering.

The low-pass filter coupling-in-one circuit 100 includes a first capacitor C2, a first inductor L2, a second capacitor C3, and a second inductor L3, wherein: the first terminal C21 of the first capacitor C2 is grounded, and the second terminal C22 is respectively connected to the input terminal 10. The first terminal L21 of the first inductor L2 is connected; the first terminal C31 of the second capacitor C3 is grounded, and the second terminal C32 is respectively connected to the output terminal 11 and the second terminal L22 of the first inductor L2; the second inductor L3 is connected to the The first inductor L2 is coupled, the first end L31 of the second inductor L3 is connected to the coupling end 12 , and the second end L32 is connected to the load end 13 . Wherein, the load terminal 13 is generally connected to a matched load, such as a 50Ω resistor.

The working principle of the low-pass filter coupling-in-one circuit 100 is as follows: the first capacitor C2, the first inductance L2 and the second capacitor C3 in the low-pass filter coupling-in-one circuit 100 are used for the A signal is low-pass filtered to obtain a second signal, and the second signal is output through the output terminal 11 . By changing the values of the first capacitor C2, the second capacitor C3, the first inductance L2, and the second inductance L3, the high-frequency part of the out-of-band spurs of the PA can be suppressed, thereby realizing the function of low-pass filtering.

The high-frequency signal (that is, the first signal) generates alternating magnetic flux through the first inductance L2, so that the second inductance L3 induces a voltage, so that the first inductance L2 and the second inductance L3 realize the coupling function through space or physically, That is, the first inductor L2 and the second inductor L3 in the low-pass filter coupling-into-one circuit 100 are used to couple and sample the first signal output by the high-pass filter circuit 201 so as to output the third signal from the coupling terminal 12 . The degree of isolation and coupling of the filter coupling circuit can be changed by changing the tightness of coupling such as the distance between the first inductor L2 and the second inductor L3.

By multiplexing the RF branch of the first capacitor C2, the first inductor L2, and the second capacitor C3, the main signal line of the coupler (that is, the second inductor L3) is moved to the filter, and the functions of the filter and the coupler Combined on one device, the size of the entire board is reduced; and the function of the filter and the coupler are combined to reduce the insertion loss on the radio frequency branch; (for example, Figure 2 and Figure 3 include 6 ports P1 to P6, and Figure 8 only includes 4 ports including input terminal 20, output terminal 11, coupling terminal 12 and load terminal 13).

As shown in FIG. 9 , it is a schematic diagram of a specific circuit structure of another filter coupling circuit provided in the embodiment of the present application. The difference from the circuit shown in FIG. 8 is that, in the filter coupling circuit 900, the high-pass filter circuit 201 may also include a first high-pass filter circuit connected between the first high-pass filter circuit and the low-pass filter coupling circuit 100, and connected to the first high-pass filter circuit. The filter circuit is connected in parallel with the second high-pass filter circuit. The second high-pass filter circuit includes a fourth inductor L4 and a fourth capacitor C4, the first end L41 of the fourth inductor L4 is connected to the second end C42 of the fourth capacitor C4, and the second end L42 of the fourth inductor L4 is respectively connected to the second end C42 of the fourth capacitor C4. The second terminal L12 of the three inductors L1 is connected to the input terminal 10 of the low-pass filter coupling circuit 100; the first terminal C41 of the fourth capacitor C4 is grounded. The second high-pass filter circuit is used for performing second-order high-pass filter on the third signal. Certainly, the high-pass filter circuit 201 may also include more parallel-connected high-pass filter circuits, so as to realize higher-order high-pass filter.

In addition, in order to increase the degree of high-frequency suppression, the filter coupling circuit 900 further includes a low-pass filter circuit 202 . The low-pass filter circuit 202 includes a fifth capacitor C5, a fifth inductor L5 and a sixth capacitor C6. Wherein, the first terminal C51 of the fifth capacitor C5 is grounded, and the second terminal of the fifth capacitor C5 is respectively connected to the output terminal 11 of the low-pass filter coupling-in-one circuit 100 and the first terminal L51 of the fifth inductor L5; the sixth capacitor The first terminal C61 of C6 is grounded, and the second terminal C62 of the sixth capacitor C6 is respectively connected to the second terminal L52 of the fifth inductor L5 and the output terminal 22 of the filter coupling circuit. The low-pass filter circuit is used to perform second-order low-pass filter on the second signal. Certainly, the filter coupling circuit may also include more low-pass filter circuits connected in series, so as to realize higher-order low-pass filter.

The filter coupling circuit may simultaneously have the above-mentioned high-order high-pass filter function and high-order low-pass filter function, or may include one of the high-order high-pass filter function and the high-order low-pass filter function.

By increasing the order of the coupling and filtering integrated device, the transmission characteristics of the entire device are changed, thereby improving the return loss of the filter, the insertion loss, and the directivity of the coupler, etc., increasing the degree of freedom of the entire device, providing for coupling and filtering The application of integrated devices in other scenarios provides the possibility.

Corresponding to the structure shown in FIG. 7B, as shown in FIG. 10, it is a schematic diagram of the circuit structure of another filter coupling circuit provided by the embodiment of the present application. The filter coupling circuit 1000 includes a low-pass filter coupling circuit 100, and also includes a high-pass filter circuit 301. The high-pass filter circuit 301 is respectively connected to the output end 11 of the low-pass filter coupling circuit 100 and the output end 30 of the filter coupling circuit 1000 .

Wherein, the low-pass filter coupling-into-one circuit 100 includes a first capacitor C2, a first inductor L2, a second capacitor C3, and a second inductor L3, wherein: the first terminal C21 of the first capacitor C2 is grounded, and the second terminal C22 is connected to the The input end 10 is connected to the first end L21 of the first inductor L2; the first end C31 of the second capacitor C3 is connected to the ground, and the second end C32 is respectively connected to the output end 11 and the second end L22 of the first inductor L2; the second inductor L3 is coupled to the first inductor L2 , the first end L31 of the second inductor L3 is connected to the coupling end 12 , and the second end L32 is connected to the load end 13 . Wherein, the load terminal 13 is generally connected to a matched load, such as a 50Ω resistor.

The working principle of the low-pass filter coupling-in-one circuit 100 is: the first capacitor C2, the first inductance L2, and the second capacitor C3 in the low-pass filter coupling-in-one circuit 100 are used to The first signal is low-pass filtered to obtain a second signal, which is output from the output terminal 11 . By changing the values of the first capacitor C2, the first inductor L2, and the second capacitor C3, the high-frequency part of the out-of-band spurs of the PA can be suppressed, thereby realizing the function of low-pass filtering.

The first signal passes through the first inductance L2 to generate alternating magnetic flux, so that the second inductance L3 induces a voltage, so that the first inductance L2 and the second inductance L3 realize the coupling function through space or physically, that is, low-pass filter coupling The first inductor L2 and the second inductor L3 in a circuit 100 are used to couple and sample the first signal so as to output the third signal from the coupling terminal 12 . The degree of isolation and coupling of the filter coupling circuit can be changed by changing the tightness of coupling such as the distance between the first inductor L2 and the second inductor L3.

The high-pass filter circuit 301 includes a first high-pass filter circuit, and the first high-pass filter circuit includes a sixth inductor L6 and a seventh capacitor C7. The first terminal L61 of the sixth inductance L6 is connected to the second terminal C72 of the seventh capacitor, and the second terminal L62 of the sixth inductance L6 is respectively connected to the output terminal 11 of the low-pass filter coupling circuit 100 and the output terminal of the filter coupling circuit. 30 connection; the first terminal C71 of the seventh capacitor is grounded, and the second terminal C72 is connected to the first terminal L61 of the sixth inductor L6.

The working principle of the high-pass filter circuit 301 is: using the characteristics of the capacitor passing through the AC and the inductor resisting the AC, the sixth inductance L6 and the seventh capacitor C7 are equivalent to an inductance, and low frequencies are easier to pass through the inductance. The second signal output from the output terminal of the low-pass filtering coupling circuit 100 is subjected to high-pass filtering to obtain a fifth signal, which is output through the output terminal 30 . By changing the values of the sixth inductor L6 and the seventh capacitor C7, the low-frequency part of the out-of-band spurs of the PA can be suppressed, thereby realizing the function of high-pass filtering.

By multiplexing the radio frequency branch of the first capacitor C2, the first inductor L2, and the second capacitor C3, the main signal line of the coupler (that is, the second inductor L3) is moved to the filter, and the function of the filter and the coupler Combined on one device, the size of the entire board is reduced; and the function of the filter and the coupler are combined to reduce the insertion loss on the radio frequency branch; (for example, Figure 2 and Figure 3 include 6 ports P1 to P6, and Figure 10 only includes 4 ports including input terminal 10, output terminal 30, coupling terminal 12 and load terminal 13).

As shown in FIG. 11 , it is a schematic diagram of a specific circuit structure of another filter coupling circuit provided in the embodiment of the present application. The difference from the circuit shown in FIG. 10 is that, in order to increase the degree of suppression of high frequencies, the filter coupling circuit 1100 also includes a low-pass filter circuit 302, and the low-pass filter circuit 302 is connected to the output terminal 11 of the filter coupling circuit 100 . The low-pass filter circuit 302 includes a ninth capacitor C9, an eighth inductor L8 and a tenth capacitor C10. Wherein, the first terminal C91 of the ninth capacitor C9 is grounded, and the second terminal C92 of the ninth capacitor C9 is respectively connected to the output terminal 11 of the filter coupling circuit 100 and the first terminal L81 of the eighth inductor L8; the tenth capacitor C10 The first terminal C101 of the tenth capacitor C10 is connected to the ground, and the second terminal C102 of the tenth capacitor C10 is connected to the second terminal L82 of the eighth inductor L8. The low-pass filter circuit is used to perform second-order low-pass filter on the second signal. Certainly, the filter coupling circuit may also include more low-pass filter circuits, so as to realize higher-order low-pass filter.

In addition, in the filtering coupling circuit 1100, the high-pass filtering circuit 301 may further include a second high-pass filtering circuit connected between the first high-pass filtering circuit and the output terminal 30 of the filtering coupling circuit and connected in parallel with the first high-pass filtering circuit. The second high-pass filter circuit includes a seventh inductor L7 and an eighth capacitor C8. Wherein, the first end L71 of the seventh inductance L7 is connected to the second end C82 of the eighth capacitor C8, and the second end L72 of the seventh inductance L7 is respectively connected to the first end L61 of the sixth inductance L6 and the output end of the filter coupling circuit 30 connection; the first terminal C81 of the eighth capacitor C8 is grounded, and the second terminal C82 of the eighth capacitor C8 is connected to the first terminal L71 of the seventh inductor L7. The second high-pass filter circuit is used to perform a second-order high-pass filter on the fourth signal output by the first high-pass filter circuit to obtain a fifth signal, which is output from the output terminal 30 . Certainly, the high-pass filter circuit 301 may also include more parallel-connected high-pass filter circuits, so as to realize higher-order high-pass filter.

The filter coupling circuit may have the above-mentioned high-order high-pass filter function and high-order low-pass filter function at the same time, or may include one of the high-order high-pass filter function and the high-order low-pass filter function.

In order to take into account various factors such as filter performance index, coupler performance index, single board size and cost, some or all components in the above-mentioned band-pass filtering and coupling module can be realized by using microstrip lines. The microstrip line is a strip line that runs on the surface of the PCB, and uses the discontinuity of the transmission line and its equivalent circuit to realize the construction of capacitive or inductive devices.

Taking the filter coupling circuit shown in FIG. 8 as an example, a schematic diagram of a corresponding microstrip line structure is shown in FIG. 12 . Wherein, it is assumed that the filter coupling circuit is set in an AP. This AP works in the 5G frequency band. In order to filter out signals on the 2.4G frequency band, the inductance value of the third inductor L1 and the capacitance value of the third capacitor C1 in this embodiment are relatively large, and discrete devices can be used (that is, microstrip lines are not used), and L1 and C1 pass through Transmission line connection. Then, for the filter coupling circuit shown in FIG. 8 , except for the high-pass filter circuit 201 (ie, the third inductor L1 and the third capacitor C1 ), the components in the low-pass filter coupling circuit 100 can all be implemented using microstrip lines.

Optionally, in FIG. 12, N is a dielectric reference plate (gray part); one surface of N is provided with a metal microstrip line (the part surrounded by the gray part) and/or a metal ground (the part surrounded by the gray part and the gray part). outside the enclosed part). The dielectric reference plate may be a Fr4 (resin material) plate. In FIG. 12 , the dotted-line boxes of different line shapes represent the microstrip line regions corresponding to the first capacitor C2 , the second capacitor C3 , the first inductor L2 , and the second inductor L3 .

Wherein, in one implementation, as shown in the left diagram of FIG. 13 , one pole of the first capacitor C2 corresponding to the second terminal C22 is the first microstrip line region C2a, one pole corresponding to the first terminal C21 is ground, and the first microstrip The stripline region C2a is coupled to ground to form a capacitor. The microstrip line and ground are the two board levels of the capacitor. The first microstrip line region C2a is strip-shaped.

In another implementation, as shown in the right figure of FIG. 13 , one pole of the first capacitor C2 corresponding to the second end C22 is the second microstrip line region C2d, and one pole corresponding to the first end C21 is the third pole connected to the ground. The microstrip line region C2e, the second microstrip line region C2d and the third microstrip line region C2e are coupled to form a capacitor. The two microstrip lines are the two board levels of the capacitor. Both the second microstrip line region C2d and the third microstrip line region C2e are elongated.

In one implementation, as shown in the left diagram of FIG. 14 , one pole of the second capacitor C3 corresponding to the second end C32 is the fourth microstrip line region C3a, one pole corresponding to the first end C31 is ground, and the fourth microstrip line Region C3a is coupled to ground to form a capacitor. The microstrip line and ground are the two board levels of the capacitor. The fourth microstrip line region C3a is strip-shaped.

In another implementation, as shown in the right figure of FIG. 14 , one pole of the second capacitor C3 corresponding to the second terminal C32 is the fifth microstrip line region C3d, and one pole corresponding to the first terminal C31 is connected to the sixth microstrip line region C3d. The microstrip line region C3e, the fifth microstrip line region C3d and the sixth microstrip line region C3e are coupled to form a capacitor. The two microstrip lines are the two board levels of the capacitor. Both the fifth microstrip line region C3d and the sixth microstrip line region C3e are elongated.

The above-mentioned microstrip line regions C2a, C2d, C2e, C3a, C3d or C3e are in the shape of a strip, which may be specifically a rectangle with an aspect ratio greater than a set threshold, or a parallelogram or trapezoid with an aspect ratio greater than a set threshold.

The above-mentioned first capacitor C2 can be realized by any one shown in FIG. 13 , and the second capacitor C3 can be realized by any one shown in FIG. 14 . The above capacitive microstrip line implementations of the first capacitor C2 and the second capacitor C3 can be used in combination. In FIG. 12 , it is described by taking the first microstrip line region C2 a coupled with the ground to form the first capacitor C2 , and the fourth microstrip line region C3 a coupled with the ground to form the second capacitor C3 as an example.

The construction of inductive devices can be realized using microstrip line regions of different widths and lengths. The first inductance L2 is the seventh microstrip line region L2a, and the second inductance L3 is the eighth microstrip line region L3a. The gap width between the seventh microstrip line region L2a and the eighth microstrip line region L3a includes: the first width A1, the second width A2, and the third width A3, the seventh microstrip line region L2a and the eighth microstrip line region The length of the gap between the stripline regions L3a is the length B1.

In FIG. 12, the first microstrip line region C2a and the fourth microstrip line region C3a are located on the first side D1 of the seventh microstrip line region L2a, and the eighth microstrip line region L3a is located on the side of the seventh microstrip line region L2a. Second side D2.

Ports

10, 11, 12 and 13 can be connected to the WIFI system through PCB traces or other methods.

Among them, the coupling degree C of the filter coupling circuit is defined as the logarithm of the ratio of the forward transmission power P3 in the main line coupled to the auxiliary line and the main line incident power P1, and the absolute value of the coupling degree is as follows:

C＝|10lg(P3/P1)|＝10lg(P1/P3)＝-20lg|S31| (1)

S31 in formula (1) is the scattering parameter between the input end 10 and the coupling end 12 .

In this embodiment, the distance between the input end 10 and the coupling end 12 on the eighth microstrip line area L3a is positively correlated with the scattering parameter between the input end 10 and the coupling end 12, and the distance between the input end 10 and the coupling end 12 The distance between them is inversely correlated with the coupling degree of the filter-coupling circuit. Wherein, the positive correlation relationship may be a direct proportional relationship, and the anti-correlation relationship may be an inverse proportional relationship. Specifically, when the distance between the input terminal 10 and the coupling terminal 12 is closer, the smaller S31 is, the greater the coupling degree of the filter coupling circuit is; and the farther the distance between the input terminal 10 and the coupling terminal 12 is , the larger S31 is, the smaller the coupling degree of the filter-coupling circuit is.

In addition, the first width A1, the second width A2, the third width A3 between the seventh microstrip line region L2a and the eighth microstrip line region L3a, the seventh microstrip line region L2a and the eighth microstrip line region L3a At least one of the lengths B1 is positively correlated with the coupling degree of the filter-coupling circuit. Wherein, the positive correlation may be a proportional relationship.

Certainly, the way of changing the coupling degree of the filter coupling and unifying circuit is not limited to the above ways.

The isolation I of the filter coupling circuit is defined as the decibel ratio of the main line incident power P1 to the output power P4 of the isolated port. The absolute value of the isolation is as follows:

I＝10lg(P1/P4)＝-20lg|S41| (2)

S41 in formula (2) is a scattering parameter between the input terminal 10 and the load terminal 13 on the eighth microstrip line region L3a. The distance between the input terminal 10 and the load terminal 13 is positively correlated with the scattering parameter between the input terminal 10 and the load terminal 13, and the distance between the input terminal 10 and the load terminal 13 is inversely related to the isolation of the filter coupling circuit relationship. Wherein, the positive correlation relationship may be a direct proportional relationship, and the anti-correlation relationship may be an inverse proportional relationship. Specifically, when the distance between the input terminal 10 and the load terminal 13 is closer, S41 is smaller, and the isolation of the filter coupling circuit is larger, and when the distance between the input terminal 10 and the load terminal 13 is farther, S41 The larger the value, the smaller the isolation of the filter-coupling circuit.

In addition, the first width A1, the second width A2, the third width A3 of the gap between the seventh microstrip line region L2a and the eighth microstrip line region L3a, the seventh microstrip line region L2a and the eighth microstrip line region At least one of the lengths B1 of the gaps between the stripline regions L3a is positively correlated with the isolation of the filter-coupling circuit. Wherein, the positive correlation may be a proportional relationship.

Certainly, the way of changing the isolation of the filtering coupling and combining circuit is not limited to the above ways.

In Fig. 12, the seventh microstrip line area L2a is in the shape of a long strip, and the eighth microstrip line area L3a is in the shape of "h", which can meet the inductance requirements of the first inductance L2 and the second inductance L3 on the basis of , so that the seventh microstrip line region L2a and the eighth microstrip line region L3a meet the coupling and isolation requirements of the low-pass filter coupling and integration circuit. In addition, the eighth microstrip line region L3a may also be in the shape of "n" or "7".

In order to further reduce the size of the entire filter-coupling circuit, the layout and wiring of components can be changed.

For example, another microstrip line structure schematic diagram shown in Figure 15 is different from the microstrip line structure shown in Figure 12 in that the eighth microstrip line region L3a, the first microstrip line region C2a and the The stripline regions C3a are all located on the first side D1 of the seventh microstripline region L2a. Here, the ground between the first microstrip line region C2a and the eighth microstrip line region L3a will increase its isolation so that its coupling can be ignored; and the ground between the fourth microstrip line region C3a and the eighth microstrip line region L3a Grounding between them increases their isolation, making their coupling negligible. The gap between the seventh microstrip line region L2a and the eighth microstrip line region L3a has a first width A1 and a second width A2, and the gap between the seventh microstrip line region L2a and the eighth microstrip line region L3a The gap between them has a first length B1. The width and/or length of the gap between the seventh microstrip line region L2a and the eighth microstrip line region L3a is set to be positively correlated with the required coupling degree between the second inductance L2 and the third inductance L3, and/or Or, the width and/or length of the gap between the seventh microstrip line region L2a and the eighth microstrip line region L3a is set to be positively correlated with the required isolation between the second inductor L2 and the third inductor L3. Wherein, the positive correlation may be a proportional relationship.

For another example, as shown in FIG. 16 , another schematic diagram of a microstrip line structure is different from the microstrip line structure shown in FIG. 12 in that the seventh microstrip line region L2a is in the shape of a "v". Wherein, the two sides of the "v" shape can be stepped or straight with a certain slope, depending on the size of the first inductance L2. The gap between the seventh microstrip line region L2a and the eighth microstrip line region L3a has a first width A1 and a second width A2, and the gap between the seventh microstrip line region L2a and the eighth microstrip line region L3a The gap between them has a first length B1. The width and/or length of the gap between the seventh microstrip line region L2a and the eighth microstrip line region L3a is set to be positively correlated with the required coupling degree between the second inductance L2 and the third inductance L3, and/or Or, the width and/or length of the gap between the seventh microstrip line region L2a and the eighth microstrip line region L3a is set to be positively correlated with the required isolation between the second inductor L2 and the third inductor L3. Wherein, the positive correlation may be a proportional relationship.

In addition, the seventh microstrip line region L2a can also be in the shape of "u". This application does not list the structure of the seventh microstrip line region L2a one by one. Within the protection scope of this application.

The above is an example of the filter-coupling circuit shown in Figure 8 to illustrate the structure of the microstrip line of the filter-coupling circuit. Similarly, it is also possible to construct the microstrip line according to the principle of microstrip line construction of capacitance and inductance, as shown in Figure 9- The microstrip line structure of the filter coupling integration circuit shown in Fig. 11 .

Adopting the microstrip line structure to realize the above filter-coupling circuit can reduce the cost of electronic equipment, reduce the size of the filter-coupling circuit, and improve the performance of the filter-coupling circuit.

The performance index of the filter-coupling circuit can be characterized by the scatter (S) parameter. The filter-coupling-in-one circuit provided in the embodiment of the present application is simulated using corresponding simulation software, and the S parameters of the filter-coupling-in-one circuit are obtained as shown in FIG. 17 . Wherein, the abscissa is the frequency, and the unit is gigahertz (GHz); the ordinate is the S parameter value, and the unit is decibel (dB). Among them, as shown in the first picture of Figure 17, the return loss S1,1 of port 1 of the device is greater than 17dB in the 5G frequency band (that is, the positions marked by #1, 2, and 3); as shown in the second picture of Figure 17 As shown, the insertion loss S2,1 of the device is less than 0.62dB in the 5G frequency band (that is, the positions marked by 1, 2, and 3#), and the suppression of the second harmonic of the 5G frequency band is greater than 19dB (that is, the positions marked by 6 and 7# location), the suppression of the 2G frequency band is greater than 38.6dB (that is, the location marked by 4, 5#); as shown in the third picture of Figure 17, the coupling degree is greater than 17.6dB on the 5G frequency , 3# marks); as shown in the fourth picture of Figure 17, the isolation S4,1 is greater than 38.6dB in the 5G frequency band (that is, the positions of 1, 2, 3# marks). To sum up, the filter-coupling integration circuit designed by the embodiment of the present application has a better radio frequency index and can meet corresponding requirements.

As shown in FIG. 18 , a filter coupling method is also provided, which is applied to the above-mentioned filter coupling integration circuit shown in FIG. 5 .

The method may include the steps of:

S1801. Low-pass filter the first signal input from the input terminal 10 to output the second signal from the output terminal 11.

S1802. Perform coupling sampling on the first signal, so as to output a third signal from the coupling end 12.

According to a filter coupling method provided by the embodiment of the present application, by multiplexing the low-pass filtering branch, the main signal line of the coupler is moved to the low-pass filtering branch, and the filtering and coupling functions are combined on one device, reducing The area of the single board is reduced, and the insertion loss of the device is reduced.

Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the method described above can refer to the description in the foregoing device embodiments, and details are not repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed devices, devices and methods can be implemented in other ways. For example, the division of this unit is only a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored, or not implement. The mutual coupling, or direct coupling, or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

A unit described as a separate component may or may not be physically separated, and a component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions may be stored in or transmitted over a computer-readable storage medium. The computer instructions can be sent from one website site, computer, server, or data center to another via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) A website site, computer, server or data center for transmission. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media. The usable medium can be read-only memory (read-only memory, ROM), or random access memory (random access memory, RAM), or magnetic medium, for example, floppy disk, hard disk, magnetic tape, magnetic disk, or optical medium, such as , a digital versatile disc (digital versatile disc, DVD), or a semiconductor medium, for example, a solid state disk (solid state disk, SSD) and the like.

Claims

A filter-coupling circuit, characterized in that it is used to low-pass filter the first signal input from the input terminal 10 to output the second signal from the output terminal 11, and is also used to couple the first signal sampled to output a third signal from the coupled terminal 12.
The filter coupling unification circuit according to claim 1, wherein the filter coupling unification circuit comprises: a first capacitor C2, a first inductance L2, a second capacitor C3 and a second inductance L3, wherein:

The first terminal C21 of the first capacitor C2 is grounded, and the second terminal C22 is respectively connected to the input terminal 10 and the first terminal L21 of the first inductor L2;

The first terminal C31 of the second capacitor C3 is grounded, and the second terminal C32 is respectively connected to the output terminal 11 and the second terminal L22 of the first inductor L2;

The second inductance L3 is coupled to the first inductance L2 , the first end L31 of the second inductance L3 is connected to the coupling end 12 , and the second end L32 is connected to the load end 13 .
The filtering and coupling circuit according to claim 2, characterized in that, one pole of the first capacitor C2 corresponding to the second end C22 is the first microstrip line region C2a, and the pole corresponding to the first end C21 One pole is ground, and the first microstrip line region C2a is coupled with ground to form a capacitor.
The filter-coupling circuit according to claim 3, wherein the first microstrip line region C2a is strip-shaped.
The filtering and coupling circuit according to claim 2, characterized in that:

One pole of the first capacitor C2 corresponding to the second terminal C22 is the second microstrip line region C2d, and one pole corresponding to the first terminal C21 is the third microstrip line region C2e connected to the ground. The second microstrip line region C2d is coupled with the third microstrip line region C2e to form a capacitor.
The filter-coupling circuit according to claim 5, wherein the second microstrip line region C2d and the third microstrip line region C2e are both strip-shaped.
The filter-coupling circuit according to any one of claims 3-6, characterized in that:

One pole of the second capacitor C3 corresponding to the second end C32 is the fourth microstrip line region C3a, and one pole corresponding to the first end C31 is the ground, and the fourth microstrip line region C3a is coupled with the ground to form a capacitance.
The filter-coupling-integration circuit according to claim 7, wherein the fourth microstrip line region C3a is strip-shaped.
The filtering and coupling circuit according to claim 7 or 8, characterized in that:

One pole of the second capacitor C3 corresponding to the second end C32 is the fifth microstrip line region C3d, and one pole corresponding to the first end C31 is the sixth microstrip line region C3e connected to the ground. The fifth microstrip line region C3d is coupled with the sixth microstrip line region C3e to form a capacitor.
The filter-coupling circuit according to claim 9, wherein the fifth microstrip line region C3d and the sixth microstrip line region C3e are both strip-shaped.
The filtering and coupling circuit according to any one of claims 2-10, wherein the first inductance L2 is the seventh microstrip line region L2a, and the second inductance L3 is the eighth microstrip line region L3a .
The filter-coupling circuit according to claim 11, wherein the seventh microstrip line area L2a is strip-shaped, "u"-shaped or "v-shaped".
According to claim 11 or 12 described filter coupling integration circuit, it is characterized in that:

The width and/or length of the gap between the seventh microstrip line region L2a and the eighth microstrip line region L3a is set to be the same as that required between the second inductance L2 and the third inductance L3 The degree of coupling is positively correlated, and/or, the width and/or length of the gap between the seventh microstrip line region L2a and the eighth microstrip line region L3a is set to be the same as the second inductance L2 and the The required isolation between the third inductors L3 is positively correlated;

The distance between the input terminal 10 and the coupling terminal 12 on the eighth microstrip line region L3a is set to be inversely correlated with the required coupling degree between the second inductance L2 and the third inductance L3 , and/or, the distance between the input terminal 10 and the load terminal 13 on the eighth microstrip line region L3a is set to be equal to the required distance between the second inductance L2 and the third inductance L3 The degree of isolation is inversely correlated.
The filter-coupling circuit according to any one of claims 11-13, characterized in that the eighth microstrip line region L3a is in the shape of "h", "n" or "7".
According to any one of claims 11-14, the filter coupling circuit is characterized in that:

When the pole of the first capacitor C2 corresponding to the second terminal C22 is the first microstrip line region C2a, and the pole corresponding to the first terminal C21 is grounded, the second capacitor C3 and the second terminal One pole corresponding to C32 is the fourth microstrip line region C3a, one pole corresponding to the first end C31 is ground, the first microstrip line region C2a and the fourth microstrip line region C3a are located on the seventh microstrip line the first side D1 of the region L2a, the eighth microstrip line region L3a is located on the second side D2 of the seventh microstrip line region L2a; or

The eighth microstrip line region L3a, the first microstrip line region C2a and the fourth microstrip line region C3a are all located on the first side D1 of the seventh microstrip line region L2a.
A filter coupling circuit, characterized in that it comprises: a high-pass filter circuit and a filter coupling integration circuit according to any one of claims 1-15;

The high-pass filter circuit is used to provide the high-pass filtered signal for the filter coupling and unification circuit, or perform high-pass filtering for the signal output by the filter coupling and unification circuit.
The filter coupling circuit according to claim 16, wherein the filter coupling circuit further comprises: a low-pass filter circuit, the input terminal of the low-pass filter circuit is connected to the output terminal 11 of the filter coupling circuit .
The filter-coupling integration circuit according to claim 16 or 17, characterized in that, the high-pass filter circuit is an N-order high-pass filter circuit, N>=2.
A filter coupling integration method, characterized in that the method is applied to the filter coupling integration circuit described in any one of claims 1-15, the method comprising:

performing low-pass filtering on the first signal input from the input terminal 10 to output the second signal from the output terminal 11;

Coupling sampling is performed on the first signal to output a third signal from the coupling terminal 12 .
An electronic device, characterized in that it comprises the filter-coupling-integration circuit according to any one of claims 1-15.