Mixed mode filtering hybrid ring coupler with broadband high isolation characteristic

Abstract

The invention discloses a mixed-mode filtering hybrid ring coupler with a broadband high isolation characteristic. The multi-band band-pass filter specifically comprises a balanced type differential input port A, a balanced type differential first output port B, a balanced type differential second output port C, a single-end input port D, a dielectric plate, six sections of bent microstrip connecting lines, five half-wavelength C-shaped resonators, six sections of terminal short-circuit feeder lines, a terminal open-circuit feeder line, six groups of defective ground trough lines and chip resistors. The balanced differential input port A comprises an input port A + and an input port A-; the structure not only can effectively suppress common-mode noise, but also can realize equal-power in-phase and inverted-phase output of two paths of signals, and also has the characteristics of frequency selective filtering and broadband high isolation, so that the structure is very suitable for being applied to various balanced microwave systems.

Description

Technical Field

[0001] The invention relates to a hybrid ring coupler, in particular to a hybrid mode filtering hybrid ring coupler with broadband high isolation characteristics. Background Art

[0002] With the development of high-speed digital circuits, balanced systems can suppress common-mode noise and interference from complex electromagnetic environments, thereby improving signal integrity and system sensitivity. For a fully balanced RF front-end system, passive components need to have a balanced structure that can better connect to the balanced circuit, avoid the use of additional balanced-unbalanced converters, namely balun structures, and reduce the size of the system. Therefore, balanced microwave devices that integrate the functions of baluns and passive components have developed rapidly. In addition, due to the increasing requirements for the size and integration of RF communication circuits, the co-design of devices is a hot topic. As a major spectrum selection component, filters can be used in communication systems to filter out unwanted noise and image interference. The co-design of couplers and filters can simultaneously realize the power distribution of couplers and the passband response of filters, reduce circuit size, and reduce insertion loss.

[0003] However, most of the existing filter hybrid ring couplers are fully balanced structures or fully single-ended structures, and there are few mixed-mode filter hybrid ring couplers that can simultaneously realize the power division functions of single-ended to balanced and balanced to balanced. In addition, the isolation between the output ports of the existing designs is poor, and there is no mixed-mode filter hybrid ring coupler that realizes broadband high isolation characteristics. Summary of the invention

[0004] According to the problems existing in the prior art, the present invention discloses a hybrid mode filter hybrid ring coupler with broadband high isolation characteristics, which specifically includes: a balanced differential input port A, a balanced differential first output port B, a balanced differential second output port C, a single-ended input port D, a dielectric plate, six sections of bent microstrip connecting lines, five half-wavelength C-shaped resonators, six sections of terminal short-circuit feeders, terminal open-circuit feeders, six groups of defective ground slot lines and patch resistors;

[0005] The balanced differential input port A includes an input port A+ and an input port A–;

[0006] The balanced differential first output port B includes an output port B+ and an output port B–;

[0007] The balanced differential second output port C includes an output port C+ and an output port C–;

[0008] The top layer of the dielectric plate is a microstrip structure, and the bottom layer is a defective floor;

[0009] The six sections of meandering microstrip connecting lines include a first meandering microstrip connecting line, a second meandering microstrip connecting line, a third meandering microstrip connecting line, a fourth meandering microstrip connecting line, a fifth meandering microstrip connecting line and a sixth meandering microstrip connecting line; the five half-wavelength C-shaped resonators include a first half-wavelength C-shaped resonator, a second half-wavelength C-shaped resonator, a third half-wavelength C-shaped resonator, a fourth half-wavelength C-shaped resonator and a fifth half-wavelength C-shaped resonator; the six sections of terminal short-circuit feeders include a first terminal short-circuit feeder, a second terminal short-circuit feeder, a third terminal short-circuit feeder, a fourth terminal short-circuit feeder, a fifth terminal short-circuit feeder and a sixth terminal short-circuit feeder; the six groups of defective ground slot lines located at the bottom layer of the dielectric plate include a first defective ground slot line, a second defective ground slot line, a third defective ground slot line, a fourth defective ground slot line, a fifth defective ground slot line and a sixth defective ground slot line;

[0010] The first meander microstrip connection line and the second meander microstrip connection line have the same structural dimensions; the third meander microstrip connection line, the fourth meander microstrip connection line, the fifth meander microstrip connection line and the sixth meander microstrip connection line have the same structural dimensions; one end of the first meander microstrip connection line is connected to the input port A+, and the other end is connected to the second terminal short-circuit feeder; one end of the second meander microstrip connection line is connected to the input port A-, and the other end is connected to the first terminal short-circuit feeder; one end of the third meander microstrip connection line is connected to the output port B+, and the other end is connected to the sixth terminal short-circuit feeder; one end of the fourth meander microstrip connection line is connected to the output port B-, and the other end is connected to the fourth terminal short-circuit feeder; one end of the fifth meander microstrip connection line is connected to the output port C+, and the other end is connected to the fifth terminal short-circuit feeder; one end of the sixth meander microstrip connection line is connected to the output port C-, and the other end is connected to the third terminal short-circuit feeder;

[0011] The first half-wavelength C-shaped resonator is located on the upper side of the first terminal short-circuit feeder and the second terminal short-circuit feeder; the second half-wavelength C-shaped resonator, the third half-wavelength C-shaped resonator, the fourth half-wavelength C-shaped resonator and the fifth half-wavelength C-shaped resonator have the same structure and size;

[0012] The second half-wavelength C-shaped resonator is located on the left side of the third terminal short-circuit feeder and the fifth terminal short-circuit feeder, on the right side of the third half-wavelength C-shaped resonator, and on the upper right side of the first half-wavelength C-shaped resonator; the third half-wavelength C-shaped resonator is located on the left side of the second half-wavelength C-shaped resonator and on the right side of the terminal open-circuit feeder; the fourth half-wavelength C-shaped resonator is located on the left side of the terminal open-circuit feeder and on the right side of the fifth half-wavelength C-shaped resonator; the fifth half-wavelength C-shaped resonator is located on the right side of the fourth terminal short-circuit feeder and the sixth terminal short-circuit feeder, on the left side of the fourth half-wavelength C-shaped resonator, and on the upper right side of the first half-wavelength C-shaped resonator;

[0013] The first terminal short-circuit feeder and the second terminal short-circuit feeder have the same structural dimensions; the third terminal short-circuit feeder, the fourth terminal short-circuit feeder, the fifth terminal short-circuit feeder and the sixth terminal short-circuit feeder have the same structural dimensions; the first terminal short-circuit feeder is located at the lower right side of the first half-wavelength C-shaped resonator, one end of which is connected to the second meandering microstrip connecting line, and the other end is grounded through a via hole; the second terminal short-circuit feeder is located at the lower left side of the first half-wavelength C-shaped resonator, one end of which is connected to the first meandering microstrip connecting line, and the other end is grounded through a via hole; the third terminal short-circuit feeder is located at the second half-wavelength The lower right side of the C-shaped resonator, one end is connected to the sixth meander microstrip connection line, and the other end is grounded through a via hole; the fourth terminal short-circuit feeder is located on the lower left side of the fifth half-wavelength C-shaped resonator, one end is connected to the fourth meander microstrip connection line, and the other end is grounded through a via hole; the fifth terminal short-circuit feeder is located on the upper right side of the second half-wavelength C-shaped resonator, one end is connected to the fifth meander microstrip connection line, and the other end is grounded through a via hole; the sixth terminal short-circuit feeder is located on the upper left side of the fifth half-wavelength C-shaped resonator, one end is connected to the third meander microstrip connection line, and the other end is grounded through a via hole;

[0014] One end of the terminal open-circuit feeder is connected to the single-ended input port D, and the other end is open;

[0015] The first defective ground slot line and the second defective ground slot line have the same structural dimensions; the first defective ground slot line is located at the bottom surface of the first half-wavelength C-shaped resonator and the second terminal short-circuit feeder; the second defective ground slot line is located at the bottom surface of the first half-wavelength C-shaped resonator and the first terminal short-circuit feeder; the third defective ground slot line, the fourth defective ground slot line, the fifth defective ground slot line and the sixth defective ground slot line have the same structural dimensions; the third defective ground slot line is located at the bottom surface of the fifth half-wavelength C-shaped resonator and the sixth terminal short-circuit feeder; the fourth defective ground slot line is located at the bottom surface of the fifth half-wavelength C-shaped resonator and the fourth terminal short-circuit feeder; the fifth defective ground slot line is located at the bottom surface of the second half-wavelength C-shaped resonator and the third terminal short-circuit feeder; the sixth defective ground slot line is located at the bottom surface of the second half-wavelength C-shaped resonator and the fifth terminal short-circuit feeder;

[0016] The chip resistor is located at the lower side of the terminal open-circuit feeder, one end of which is connected to the fourth half-wavelength C-shaped resonator, and the other end of which is connected to the third half-wavelength C-shaped resonator.

[0017] By adjusting the resistance R of the first half-wavelength C-shaped resonator, the second half-wavelength C-shaped resonator, the third half-wavelength C-shaped resonator, the fourth half-wavelength C-shaped resonator, the fifth half-wavelength C-shaped resonator and the chip resistor 1 , thereby adjusting the filtering characteristics and isolation characteristics of the mixed-mode filtering hybrid ring coupler.

[0018] The operating bandwidth and in-band matching characteristics of the mixed-mode filtering hybrid ring coupler are adjusted by adjusting the first terminal short-circuited feeder, the second terminal short-circuited feeder, the third terminal short-circuited feeder, the fourth terminal short-circuited feeder, the fifth terminal short-circuited feeder, the sixth terminal short-circuited feeder, the terminal open-circuited feeder, the first defective ground slot line, the second defective ground slot line, the third defective ground slot line, the fourth defective ground slot line, the fifth defective ground slot line and the sixth defective ground slot line.

[0019] In order to make up for the shortcomings of the current hybrid ring coupler in the research on the expansion of the mixed mode filtering function, the present invention provides a hybrid mode filtering hybrid ring coupler with broadband high isolation characteristics. The present invention integrates the balanced architecture and filtering function into the design of the coupler, avoiding the cascade of additional baluns and filtering structures, and the hybrid mode filtering hybrid ring coupler has broadband high isolation and high common mode rejection characteristics. In addition, the hybrid mode filtering hybrid ring coupler can be implemented on a single-layer PCB board, which is conducive to integrated processing and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of a mixed-mode filtering hybrid ring coupler with broadband high isolation characteristics of the present invention;

[0022] Figure 2 It is a hybrid S parameter amplitude curve diagram of a hybrid mode filter hybrid ring coupler with broadband high isolation characteristics of the present invention when the differential port A is excited;

[0023] Figure 3 It is a hybrid S parameter amplitude curve diagram of a hybrid mode filter hybrid ring coupler with broadband high isolation characteristics of the present invention when a single-end port D is excited;

[0024] Figure 4 It is a hybrid S parameter amplitude curve diagram of a hybrid mode filter hybrid ring coupler with broadband high isolation characteristics under common mode signal excitation of the present invention;

[0025] Figure 5 It is a phase relationship curve diagram of a mixed-mode filtering hybrid ring coupler with broadband high isolation characteristics of the present invention. DETAILED DESCRIPTION

[0026] In order to make the technical solutions and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention:

[0027] like Figure 1 A hybrid mode filter hybrid ring coupler with broadband high isolation characteristics shown in FIG. 1 includes a balanced differential input port A, a balanced differential first output port B, a balanced differential second output port C, a single-ended input port D 8, a dielectric plate 1, six sections of meandering microstrip connecting lines, five half-wavelength C-shaped resonators, six sections of terminal short-circuit feed lines, a terminal open-circuit feed line 20, six groups of defective ground slot lines and a chip resistor 33;

[0028] The balanced differential input port A includes an input port A+2 and an input port A–3;

[0029] The balanced differential first output port B includes an output port B+4 and an output port B-5;

[0030] The balanced differential second output port C includes an output port C+6 and an output port C-7;

[0031] The top layer of the dielectric plate 1 is a microstrip structure and the bottom layer is a defective floor;

[0032] The six sections of meandering microstrip connecting lines include a first meandering microstrip connecting line 9, a second meandering microstrip connecting line 10, a third meandering microstrip connecting line 11, a fourth meandering microstrip connecting line 12, a fifth meandering microstrip connecting line 13 and a sixth meandering microstrip connecting line 14; the five half-wavelength C-shaped resonators include a first half-wavelength C-shaped resonator 15, a second half-wavelength C-shaped resonator 16, a third half-wavelength C-shaped resonator 17, a fourth half-wavelength C-shaped resonator 18 and a fifth half-wavelength C-shaped resonator Resonator 19; the six sections of terminal short-circuit feeder include a first terminal short-circuit feeder 21, a second terminal short-circuit feeder 22, a third terminal short-circuit feeder 23, a fourth terminal short-circuit feeder 24, a fifth terminal short-circuit feeder 25 and a sixth terminal short-circuit feeder 26; the six groups of defective ground slot lines located at the bottom layer of the dielectric plate 1 include a first defective ground slot line 27, a second defective ground slot line 28, a third defective ground slot line 29, a fourth defective ground slot line 30, a fifth defective ground slot line 31 and a sixth defective ground slot line 32;

[0033] The first meandering microstrip connection line 9 and the second meandering microstrip connection line 10 have the same structural dimensions; the third meandering microstrip connection line 11, the fourth meandering microstrip connection line 12, the fifth meandering microstrip connection line 13 and the sixth meandering microstrip connection line 14 have the same structural dimensions; one end of the first meandering microstrip connection line 9 is connected to the input port A+2, and the other end is connected to the second terminal short-circuit feeder 22; one end of the second meandering microstrip connection line 10 is connected to the input port A-3, and the other end is connected to the first terminal short-circuit feeder 21; One end of the third meander microstrip connection line 11 is connected to the output port B+4, and the other end is connected to the sixth terminal short-circuit feeder 26; one end of the fourth meander microstrip connection line 12 is connected to the output port B-5, and the other end is connected to the fourth terminal short-circuit feeder 24; one end of the fifth meander microstrip connection line 13 is connected to the output port C+6, and the other end is connected to the fifth terminal short-circuit feeder 25; one end of the sixth meander microstrip connection line 14 is connected to the output port C-7, and the other end is connected to the third terminal short-circuit feeder 23;

[0034] The first half-wavelength C-shaped resonator 15 is located on the upper side of the first terminal short-circuit feeder 21 and the second terminal short-circuit feeder 22; the second half-wavelength C-shaped resonator 16, the third half-wavelength C-shaped resonator 17, the fourth half-wavelength C-shaped resonator 18 and the fifth half-wavelength C-shaped resonator 19 have the same structure and size;

[0035] The second half-wavelength C-shaped resonator 16 is located on the left side of the third terminal short-circuit feeder 23 and the fifth terminal short-circuit feeder 25, on the right side of the third half-wavelength C-shaped resonator 17, and on the upper right side of the first half-wavelength C-shaped resonator 15; the third half-wavelength C-shaped resonator 17 is located on the left side of the second half-wavelength C-shaped resonator 16 and on the right side of the terminal open-circuit feeder 20; the fourth half-wavelength C-shaped resonator 18 is located on the left side of the terminal open-circuit feeder 20 and on the right side of the fifth half-wavelength C-shaped resonator 19; the fifth half-wavelength C-shaped resonator 19 is located on the right side of the fourth terminal short-circuit feeder 24 and the sixth terminal short-circuit feeder 26, on the left side of the fourth half-wavelength C-shaped resonator 18, and on the upper right side of the first half-wavelength C-shaped resonator 15;

[0036] The first terminal short-circuit feeder 21 and the second terminal short-circuit feeder 22 have the same structural dimensions; the third terminal short-circuit feeder 23, the fourth terminal short-circuit feeder 24, the fifth terminal short-circuit feeder 25 and the sixth terminal short-circuit feeder 26 have the same structural dimensions; the first terminal short-circuit feeder 21 is located at the lower right side of the first half-wavelength C-shaped resonator 15, one end of which is connected to the second meandering microstrip connecting line 10, and the other end is grounded through a via hole; the second terminal short-circuit feeder 22 is located at the lower left side of the first half-wavelength C-shaped resonator 15, one end of which is connected to the first meandering microstrip connecting line 9, and the other end is grounded through a via hole; the third terminal short-circuit feeder 23 is located at the second half-wavelength C-shaped resonator 15, one end of which is connected to the first meandering microstrip connecting line 9, and the other end is grounded through a via hole; The fourth terminal short-circuit feeder 24 is located at the lower right side of the fifth half-wavelength C-shaped resonator 19, one end is connected to the sixth meander microstrip connection line 14, and the other end is grounded through a via hole; the fourth terminal short-circuit feeder 24 is located at the lower left side of the fifth half-wavelength C-shaped resonator 19, one end is connected to the fourth meander microstrip connection line 12, and the other end is grounded through a via hole; the fifth terminal short-circuit feeder 25 is located at the upper right side of the second half-wavelength C-shaped resonator 16, one end is connected to the fifth meander microstrip connection line 13, and the other end is grounded through a via hole; the sixth terminal short-circuit feeder 26 is located at the upper left side of the fifth half-wavelength C-shaped resonator 19, one end is connected to the third meander microstrip connection line 11, and the other end is grounded through a via hole;

[0037] One end of the terminal open-circuit feeder 20 is connected to the single-ended input port D8 and the other end is open;

[0038] The first defective ground slot line 27 and the second defective ground slot line 28 have the same structural dimensions; the first defective ground slot line 27 is located at the bottom surface of the first half-wavelength C-shaped resonator 15 and the second terminal short-circuit feeder 22; the second defective ground slot line 28 is located at the bottom surface of the first half-wavelength C-shaped resonator 15 and the first terminal short-circuit feeder 21; the third defective ground slot line 29, the fourth defective ground slot line 30, the fifth defective ground slot line 31 and the sixth defective ground slot line 32 have the same structural dimensions; the third defective ground slot line 29 is located at the bottom surface of the fifth half-wavelength C-shaped resonator 19 and the sixth terminal short-circuit feeder 26; the fourth defective ground slot line 30 is located at the bottom surface of the fifth half-wavelength C-shaped resonator 19 and the fourth terminal short-circuit feeder 24; the fifth defective ground slot line 31 is located at the bottom surface of the second half-wavelength C-shaped resonator 16 and the third terminal short-circuit feeder 23; the sixth defective ground slot line 32 is located at the bottom surface of the second half-wavelength C-shaped resonator 16 and the fifth terminal short-circuit feeder 25;

[0039] The chip resistor 33 is located at the lower side of the terminal open-circuit feed line 20 , one end of which is connected to the fourth half-wavelength C-shaped resonator 18 , and the other end of which is connected to the third half-wavelength C-shaped resonator 17 .

[0040] By adjusting the resistance R of the first half-wavelength C-shaped resonator 15, the second half-wavelength C-shaped resonator 16, the third half-wavelength C-shaped resonator 17, the fourth half-wavelength C-shaped resonator 18, the fifth half-wavelength C-shaped resonator 19 and the chip resistor 33 1 , thereby adjusting the filtering characteristics and isolation characteristics of the mixed-mode filtering hybrid ring coupler.

[0041] By adjusting the first terminal short-circuit feeder 21, the second terminal short-circuit feeder 22, the third terminal short-circuit feeder 23, the fourth terminal short-circuit feeder 24, the fifth terminal short-circuit feeder 25, the sixth terminal short-circuit feeder 26, the terminal open-circuit feeder 20, the first defective ground slot line 27, the second defective ground slot line 28, the third defective ground slot line 29, the fourth defective ground slot line 30, the fifth defective ground slot line 31 and the sixth defective ground slot line 32, the operating bandwidth and in-band matching characteristics of the mixed-mode filtering hybrid ring coupler are adjusted.

[0042] Specific example: This example lists a mixed-mode filter hybrid ring coupler with broadband high isolation characteristics. Figure 2 As shown, when the balanced differential input port A of the hybrid mode filter hybrid ring coupler with broadband high isolation characteristics described in the present invention is excited, the center frequency of the hybrid mode filter hybrid ring coupler is 2.46 GHz, the differential mode insertion loss is 3.61 dB, and the differential mode return loss |S ddAA |<-10dB passband frequency range is 2.35GHz~2.57GHz (relative bandwidth is 8.9%); in the frequency range of 1.0GHz~5.0GHz, the transmission isolation of the differential signal between the balanced differential first output port B and the balanced differential second output port C |S ddBC | Both are less than -30dB, the transmission isolation of differential mode signals between the balanced differential input port A and the single-ended input port D | S sdDA | are all less than -55dB, with broadband differential mode high isolation characteristics. Figure 3 As shown, when the single-ended input port D of the hybrid mode filter hybrid ring coupler with broadband high isolation characteristics is excited, the center frequency of the hybrid mode filter hybrid ring coupler is also 2.46 GHz, the insertion loss is 3.67 dB, and the return loss |S DD |<-10dB passband frequency range is 2.35GHz~2.57GHz (relative bandwidth is 8.9%); in the frequency range of 1.0GHz~5.0GHz, the transmission isolation of common mode signal between balanced differential input port A and single-ended input port D |S csAD | are all less than -28.5dB, with broadband common mode high isolation characteristics. Figure 4 As shown, the common-mode reflection coefficient of the balanced differential input port A |S ccAAThe frequency range of |>-0.15dB is 1.0GHz~4.0GHz; the common-mode transmission coefficient of the common-mode signal transmitted from the balanced differential input port A to the balanced differential first output port B |S ccBA | and the common-mode transmission coefficient transmitted from the balanced differential input port A to the balanced differential second output port C |S ccCA |same, and less than -40dB in the frequency range of 1.0GHz to 4.8GHz, with broadband common-mode rejection characteristics; common-mode signal transmission isolation between the balanced differential first output port B and the balanced differential second output port C |S ccCB |In the frequency range of 1.0GHz to 4.85GHz, it is less than -40dB and has broadband common mode high isolation characteristics. Figure 5 As shown, within the frequency range of 2.0GHz to 3.0GHz, the phase difference between the differential signal transmitted from the balanced differential first input port A to the balanced differential first output port B and the differential signal transmitted from the balanced differential first input port A to the balanced differential second output port C is 180±0.5°, and the phase difference between the single-ended signal transmitted from the single-ended input port D to the balanced differential first output port B and the single-ended signal transmitted from the single-ended input port D to the balanced differential second output port C is 0±0.5°, with broadband anti-phase and in-phase output characteristics.

[0043] In summary, the mixed-mode filtering hybrid ring coupler with broadband high isolation characteristics described in the present invention can not only effectively suppress common-mode noise while achieving equal-power in-phase and anti-phase output of two signals, but also has frequency selective filtering and broadband high isolation characteristics, and is therefore very suitable for application in various balanced microwave systems.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A mixed-mode filter hybrid ring coupler with broadband high isolation characteristics, characterized in that include: A balanced differential input port A, a balanced differential first output port B, a balanced differential second output port C, a single-ended input port D (8), a dielectric plate (1), six sections of bent microstrip connecting lines, five half-wavelength C-shaped resonators, six sections of terminal short-circuited feed lines, a terminal open-circuited feed line (20), six groups of defective ground slot lines and a chip resistor (33); The balanced differential input port A includes an input port A+(2) and an input port A–(3); The balanced differential first output port B includes an output port B+(4) and an output port B–(5); The balanced differential second output port C includes an output port C+(6) and an output port C–(7); The top layer of the dielectric plate (1) is a microstrip structure, and the bottom layer is a defective floor; The six sections of meandering microstrip connecting lines include a first meandering microstrip connecting line (9), a second meandering microstrip connecting line (10), a third meandering microstrip connecting line (11), a fourth meandering microstrip connecting line (12), a fifth meandering microstrip connecting line (13) and a sixth meandering microstrip connecting line (14); the five half-wavelength C-shaped resonators include a first half-wavelength C-shaped resonator (15), a second half-wavelength C-shaped resonator (16), a third half-wavelength C-shaped resonator (17), a fourth half-wavelength C-shaped resonator (18) and a fifth half-wavelength C-shaped resonator ( 19); the six sections of terminal short-circuit feeders include a first terminal short-circuit feeder (21), a second terminal short-circuit feeder (22), a third terminal short-circuit feeder (23), a fourth terminal short-circuit feeder (24), a fifth terminal short-circuit feeder (25) and a sixth terminal short-circuit feeder (26); the six groups of defective ground slot lines located at the bottom layer of the dielectric plate (1) include a first defective ground slot line (27), a second defective ground slot line (28), a third defective ground slot line (29), a fourth defective ground slot line (30), a fifth defective ground slot line (31) and a sixth defective ground slot line (32); The first meandering microstrip connecting line (9) and the second meandering microstrip connecting line (10) have the same structural dimensions; the third meandering microstrip connecting line (11), the fourth meandering microstrip connecting line (12), the fifth meandering microstrip connecting line (13) and the sixth meandering microstrip connecting line (14) have the same structural dimensions; one end of the first meandering microstrip connecting line (9) is connected to the input port A+ (2), and the other end is connected to the second terminal short-circuit feeder (22); one end of the second meandering microstrip connecting line (10) is connected to the input port A- (3), and the other end is connected to the first terminal short-circuit feeder (21); One end of the third meandering microstrip connecting line (11) is connected to the output port B+ (4), and the other end is connected to the sixth terminal short-circuit feeder (26); one end of the fourth meandering microstrip connecting line (12) is connected to the output port B- (5), and the other end is connected to the fourth terminal short-circuit feeder (24); one end of the fifth meandering microstrip connecting line (13) is connected to the output port C+ (6), and the other end is connected to the fifth terminal short-circuit feeder (25); one end of the sixth meandering microstrip connecting line (14) is connected to the output port C- (7), and the other end is connected to the third terminal short-circuit feeder (23); The first half-wavelength C-shaped resonator (15) is located on the upper side of the first terminal short-circuit feeder (21) and the second terminal short-circuit feeder (22); the second half-wavelength C-shaped resonator (16), the third half-wavelength C-shaped resonator (17), the fourth half-wavelength C-shaped resonator (18) and the fifth half-wavelength C-shaped resonator (19) have the same structure and size; The second half-wavelength C-shaped resonator (16) is located on the left side of the third terminal short-circuit feeder (23) and the fifth terminal short-circuit feeder (25), on the right side of the third half-wavelength C-shaped resonator (17), and on the upper right side of the first half-wavelength C-shaped resonator (15); the third half-wavelength C-shaped resonator (17) is located on the left side of the second half-wavelength C-shaped resonator (16) and on the right side of the terminal open-circuit feeder (20); the fourth half-wavelength C-shaped resonator (18) is located on the left side of the terminal open-circuit feeder (20) and on the right side of the fifth half-wavelength C-shaped resonator (19); the fifth half-wavelength C-shaped resonator (19) is located on the right side of the fourth terminal short-circuit feeder (24) and the sixth terminal short-circuit feeder (26), on the left side of the fourth half-wavelength C-shaped resonator (18), and on the upper right side of the first half-wavelength C-shaped resonator (15); The first terminal short-circuit feeder (21) and the second terminal short-circuit feeder (22) have the same structural dimensions; the third terminal short-circuit feeder (23), the fourth terminal short-circuit feeder (24), the fifth terminal short-circuit feeder (25) and the sixth terminal short-circuit feeder (26) have the same structural dimensions; the first terminal short-circuit feeder (21) is located at the lower right side of the first half-wavelength C-shaped resonator (15), one end of which is connected to the second meandering microstrip connecting line (10), and the other end of which is grounded through a via hole; the second terminal short-circuit feeder (22) is located at the lower left side of the first half-wavelength C-shaped resonator (15), one end of which is connected to the first meandering microstrip connecting line (9), and the other end of which is grounded through a via hole; the third terminal short-circuit feeder (23) is located at the lower right side of the first half-wavelength C-shaped resonator (15), one end of which is connected to the first meandering microstrip connecting line (9), and the other end of which is grounded through a via hole; The fourth terminal short-circuit feeder (24) is located at the lower right side of the second half-wavelength C-shaped resonator (16), one end of which is connected to the sixth meandering microstrip connection line (14), and the other end of which is grounded through a via hole; the fourth terminal short-circuit feeder (24) is located at the lower left side of the fifth half-wavelength C-shaped resonator (19), one end of which is connected to the fourth meandering microstrip connection line (12), and the other end of which is grounded through a via hole; the fifth terminal short-circuit feeder (25) is located at the upper right side of the second half-wavelength C-shaped resonator (16), one end of which is connected to the fifth meandering microstrip connection line (13), and the other end of which is grounded through a via hole; the sixth terminal short-circuit feeder (26) is located at the upper left side of the fifth half-wavelength C-shaped resonator (19), one end of which is connected to the third meandering microstrip connection line (11), and the other end of which is grounded through a via hole; One end of the terminal open-circuit feeder (20) is connected to the single-ended input port D (8), and the other end is open-circuited; The first defective ground slot line (27) and the second defective ground slot line (28) have the same structural dimensions; the first defective ground slot line (27) is located at the bottom surface of the first half-wavelength C-shaped resonator (15) and the second terminal short-circuit feeder (22); the second defective ground slot line (28) is located at the bottom surface of the first half-wavelength C-shaped resonator (15) and the first terminal short-circuit feeder (21); the third defective ground slot line (29), the fourth defective ground slot line (30), the fifth defective ground slot line (31) and the sixth defective ground slot line (32) have the same structural dimensions; The third defective ground slot line (29) is located at the bottom surface of the fifth half-wavelength C-shaped resonator (19) and the sixth terminal short-circuit feeder (26); the fourth defective ground slot line (30) is located at the bottom surface of the fifth half-wavelength C-shaped resonator (19) and the fourth terminal short-circuit feeder (24); the fifth defective ground slot line (31) is located at the bottom surface of the second half-wavelength C-shaped resonator (16) and the third terminal short-circuit feeder (23); the sixth defective ground slot line (32) is located at the bottom surface of the second half-wavelength C-shaped resonator (16) and the fifth terminal short-circuit feeder (25); The chip resistor (33) is located at the lower side of the terminal open-circuit feed line (20), one end of which is connected to the fourth half-wavelength C-shaped resonator (18), and the other end of which is connected to the third half-wavelength C-shaped resonator (17).

2. The mixed-mode filtering hybrid ring coupler with broadband high isolation characteristics according to claim 1, characterized in that: The filtering characteristics and isolation characteristics of the mixed-mode filtering hybrid ring coupler are adjusted by adjusting the resistance value R1 of the first half-wavelength C-shaped resonator (15), the second half-wavelength C-shaped resonator (16), the third half-wavelength C-shaped resonator (17), the fourth half-wavelength C-shaped resonator (18), the fifth half-wavelength C-shaped resonator (19), and the chip resistor (33).

3. The mixed-mode filtering hybrid ring coupler with broadband high isolation characteristics according to claim 1, characterized in that: The operating bandwidth and in-band matching characteristics of the mixed-mode filtering hybrid ring coupler are adjusted by adjusting the first terminal short-circuit feeder (21), the second terminal short-circuit feeder (22), the third terminal short-circuit feeder (23), the fourth terminal short-circuit feeder (24), the fifth terminal short-circuit feeder (25), the sixth terminal short-circuit feeder (26), the terminal open-circuit feeder (20), the first defective ground slot line (27), the second defective ground slot line (28), the third defective ground slot line (29), the fourth defective ground slot line (30), the fifth defective ground slot line (31) and the sixth defective ground slot line (32).

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