Micro-strip patch cavity dual-passband filtering power divider

Abstract

The embodiment of the invention provides a micro-strip patch cavity dual-passband filtering power divider, and relates to the technical field of filtering power dividers, the micro-strip patch cavity dual-passband filtering power divider comprises a micro-strip patch main body, the micro-strip patch main body is provided with an input port and at least two output ports, and the micro-strip patch main body is provided with a plurality of slots; the connecting piece is connected to the output ports at the same time; and the plurality of isolation resistors are located between two adjacent output ports, and the isolation resistors are arranged on the microstrip patch main body or the connecting piece. According to the microstrip patch cavity dual-passband filtering power divider provided by the embodiment of the invention, the problems of complex overall structure, high processing difficulty and high cost of a filtering power divider in the prior art are solved.

Description

Technical Field

[0001] The present application relates to the technical field of filter power dividers, and in particular to a microstrip patch cavity dual-passband filter power divider. Background Art

[0002] Filters and power dividers are indispensable components in wireless network communication systems. Filter power dividers integrate the functions of both into one component.

[0003] In the related technologies, the filter power divider is mostly realized by microstrip or waveguide construction. For example, the filter power divider using microstrip coupled lines to realize satellite communication, the high selectivity filter power divider with three transmission zeros, and the dual-passband filter power divider based on substrate integrated waveguide resonator.

[0004] However, the filter power divider designed above has a complex overall structure, is difficult to manufacture, and has high cost. Summary of the invention

[0005] The embodiment of the present application provides a microstrip patch cavity dual-passband filter power divider to solve the problems of complex overall structure, difficult processing and high cost of the filter power divider in the prior art.

[0006] The embodiment of the present application provides a dual-passband filtering power divider, comprising:

[0007] A microstrip patch body, wherein the microstrip patch body has an input port and at least two output ports, and a plurality of slots are arranged on the microstrip patch body;

[0008] A connector, the connector being connected to each of the output ports at the same time;

[0009] A plurality of isolation resistors, wherein the isolation resistors are located between two adjacent output ports and are arranged on the microstrip patch body or the connector.

[0010] In a possible implementation manner, the at least two output ports include a first output port and a second output port;

[0011] The microstrip patch body is in the shape of an equilateral triangle, one corner of the microstrip patch body is the input port, and the other two corners are respectively the first output port and the second output port;

[0012] The input port is connected to an input feeder, the first output port is connected to a first output feeder, the second output port is connected to a second output feeder, and the connecting member is simultaneously connected to the first output feeder and the second output feeder.

[0013] In a possible implementation manner, the connecting member includes a first microstrip line, a second microstrip line, and an intermediate microstrip line, one end of the intermediate microstrip line is connected to the first output feeder line through the first microstrip line, and the other end of the intermediate microstrip line is connected to the second output feeder line through the second microstrip line;

[0014] The extending direction of the middle microstrip line is parallel to the extending direction of the microstrip patch body toward the edge of one end of the middle microstrip line, and the first microstrip line and the second microstrip line are symmetrically distributed at two ends of the middle microstrip line.

[0015] In a possible implementation manner, the isolation resistor includes a first isolation resistor, the first isolation resistor is arranged on the middle microstrip line, and the first isolation resistor is located on a symmetry axis of the microstrip patch body passing through the input port.

[0016] In a possible implementation manner, the slot includes a first slot, and the first slot is located at one end of the microstrip patch body facing the input port;

[0017] The slot also includes a second slot and a third slot, the second slot and the third slot are both connected to the edge of the microstrip patch body away from the input port, and the second slot and the third slot are symmetrically arranged with the symmetry axis of the microstrip patch body through the input port as the center.

[0018] In a possible implementation manner, the slot further includes a fourth slot, the fourth slot is connected to an edge of the microstrip patch body away from the input port, and the fourth slot is located between the second slot and the third slot.

[0019] In a possible implementation manner, the slot further includes a middle slot, and the middle slot is located at a center position of the microstrip patch body.

[0020] In a possible implementation manner, the isolation resistor further includes a plurality of second isolation resistors, and the second isolation resistors are arranged at a portion of the microstrip patch body corresponding to the fourth slot.

[0021] In a possible implementation manner, the first slot, the fourth slot, the middle slot, and each of the isolation resistors are located on a symmetry axis of the microstrip patch body passing through the input port.

[0022] In a possible implementation manner, at least one metal through hole is formed on the microstrip patch body, and the metal through hole is located on a symmetry axis of the microstrip patch body passing through the input port.

[0023] The embodiment of the present application provides a microstrip patch cavity dual-passband filter power divider, which is provided by: a microstrip patch body, the microstrip patch body has an input port and at least two output ports, and a plurality of slots are provided on the microstrip patch body; a connector, the connector is connected to each output port at the same time; a plurality of isolation resistors, the isolation resistor is located between two adjacent output ports, and the isolation resistor is provided on the microstrip patch body or the connector. Thus, the microstrip patch cavity dual-passband filter power divider has dual-passband performance, and at the same time, under the action of each slot, a wider frequency band range is achieved; isolation resistors can also be used to provide isolation between different output ports, which helps to reduce mutual interference between the output ports and ensure signal transmission quality; at the same time, the microstrip patch cavity dual-passband filter power divider has a simple structure, is easy to process and integrate, and has low cost; when installed, it can be implemented on a single PCB board, and the installation is convenient; it can also make full use of the circuit space, greatly reduce the circuit volume, and solve the problems of complex overall structure, high processing difficulty and high cost of the filter power divider in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0025] Figure 1 A schematic diagram of the structure of a microstrip patch cavity dual-passband filter power divider provided in this application;

[0026] Figure 2 for Figure 1 S-parameter simulation and test results of the dual-passband filter power divider in the microstrip patch cavity;

[0027] Figure 3 for Figure 1 Parameter simulation and test results of the first passband and second passband of the dual-passband filter power divider in the microstrip patch cavity.

[0028] Description of reference numerals:

[0029] 100-microstrip patch body; 110-input port; 111-input feeder; 120-first output port; 121-first output feeder; 130-second output port; 131-second output feeder; 140-first slot; 150-second slot; 160-third slot; 170-fourth slot; 180-middle slot; 190-metal through hole;

[0030] 200-connector; 210-first microstrip line; 220-second microstrip line; 230-middle microstrip line;

[0031] 300 - isolation resistor; 310 - first isolation resistor; 320 - second isolation resistor.

[0032] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0033] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0034] In the related art, filters and power dividers are indispensable components in wireless network communication systems, and filter power dividers integrate the functions of the two into one component. Usually, filter power dividers are mostly implemented by microstrip or waveguide.

[0035] For example, the filter power divider that uses microstrip coupled lines to achieve satellite communication and the high-selectivity filter power divider with three transmission zeros are affected by the quality factor, their insertion loss is not ideal and their structure is complex; the dual-passband filter power divider based on substrate integrated waveguide resonator has good isolation, but the use of high-order modes in this design will result in an overall large size and complex structure.

[0036] Therefore, each of the above-mentioned dual-passband filter power dividers has the following disadvantages: complex overall structure, difficult processing, and high cost.

[0037] Therefore, the embodiment of the present application provides a microstrip patch cavity dual-passband filter power divider, by setting: a microstrip patch body, the microstrip patch body has an input port and at least two output ports, and a plurality of slots are arranged on the microstrip patch body; a connector, the connector is connected to each output port at the same time; a plurality of isolation resistors, the isolation resistor is located between two adjacent output ports, and the isolation resistor is arranged on the microstrip patch body or the connector. Therefore, the microstrip patch cavity dual-passband filter power divider has dual-passband performance, and at the same time, under the action of each slot, a wider frequency band range is achieved; isolation resistors can also be used to provide isolation between different output ports, which helps to reduce mutual interference between the output ports and ensure the signal transmission quality; at the same time, the dual-passband filter power divider has a simple structure, is easy to process and integrate, and has low cost; when installed, it can be implemented on a single PCB board, and the installation is convenient; it can also make full use of the circuit space, greatly reduce the circuit volume, and solve the problems of complex overall structure, high processing difficulty and high cost of the filter power divider in the prior art.

[0038] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0039] like Figure 1 As shown, a microstrip patch cavity dual-passband filter power divider provided in an embodiment of the present application includes:

[0040] A microstrip patch body 100, the microstrip patch body 100 has an input port 110 and at least two output ports, and a plurality of slots are arranged on the microstrip patch body 100;

[0041] A connector 200, the connector 200 is connected to each output port at the same time;

[0042] A plurality of isolation resistors 300 are provided. The isolation resistors 300 are located between two adjacent output ports. The isolation resistors 300 are arranged on the microstrip patch body 100 or the connector 200 .

[0043] Specifically, the microstrip patch body 100 is an equilateral triangle-shaped microstrip patch resonator, see Figure 1 , the microstrip patch body 100 is arranged vertically, so that the corner of the upper end of the microstrip patch body 100 is the top angle, and the two corners of the lower end are the bottom angles. During implementation, a number of holes can be etched on the microstrip patch body 100 to form slots. Other methods can also be used to process slots on the microstrip patch body 100, and there is no limitation to this. The working bandwidth of the microstrip patch body 100 is expanded through the slots, so that the microstrip patch body 100 can adapt to a wider frequency range and have a better filtering effect.

[0044] In this embodiment, one input port 110 is provided and two output ports are provided. Of course, in other embodiments, the output ports or the input ports 110 may be provided in other numbers.

[0045] One corner of the microstrip patch body 100 is an input port 110 . In this embodiment, the top corner of the microstrip patch body 100 is the input port 110 .

[0046] The two output ports are respectively the first output port 120 and the second output port 130, and the other two corners are respectively the first output port 120 and the second output port 130. In this embodiment, the two bottom corners of the microstrip patch body 100 are respectively the first output port 120 and the second output port 130.

[0047] The connector 200 is located at the side of the microstrip patch body 100, the middle section of the connector 200 is spaced apart from the microstrip patch body 100, and both ends of the connector 200 are respectively connected to the first output port 120 and the second output port 130, and are both electrically connected, so as to achieve the dual-passband performance of the filter power divider.

[0048] The isolation resistor 300 is located between the first output port 120 and the second output port 130, and is disposed on the microstrip patch body 100 or the connector 200. Thus, the isolation resistor 300 can provide isolation between the first output port 120 and the second output port 130, which helps to reduce mutual interference between the output ports and ensure signal transmission quality.

[0049] Therefore, the microstrip patch cavity dual-passband filter power divider has dual-passband performance, and at the same time, under the action of each slot, a wider frequency band range is achieved; the isolation resistor 300 can also be used to provide isolation between different output ports, which helps to reduce mutual interference between the output ports and ensure the signal transmission quality; at the same time, the dual-passband filter power divider has a simple structure, is easy to process and integrate, and has low cost; when installing, it can be implemented on a single PCB board, and the installation is convenient; the three-sided symmetry characteristics of the equilateral triangle-shaped microstrip patch resonator can be used to make full use of the circuit space, greatly reducing the circuit volume, and solving the problems of complex overall structure, difficult processing, and high cost of the filter power divider in the prior art.

[0050] During implementation, for example, the microstrip patch cavity dual-passband filter power divider can be applied to indoor distribution systems, which is beneficial to significantly improve the coverage and signal quality of indoor wireless networks and provide users with a better communication experience.

[0051] like Figure 1 As shown, further, the input port 110 is connected to the input feeder 111 , the first output port 120 is connected to the first output feeder 121 , the second output port 130 is connected to the second output feeder 131 , and the connector 200 is simultaneously connected to the first output feeder 121 and the second output feeder 131 .

[0052] The two ends of the connector 200 are respectively connected to the first output feeder 121 and the second output feeder 131. During implementation, the input feeder 111, the first output feeder 121 and the second output feeder 131 can be connected to an external circuit, which helps to improve the convenience of the microstrip patch cavity dual-passband filter power divider when it is actually connected to the circuit.

[0053] It should be noted that, during implementation, the extension lines of the input feed line 111 , the first output feed line 121 , and the second output feed line 131 may intersect at the center point of the microstrip patch body 100 , so as to fully utilize the three-sided symmetry of the equilateral triangle.

[0054] In some embodiments, the connector 200 includes a first microstrip line 210, a second microstrip line 220, and an intermediate microstrip line 230, one end of the intermediate microstrip line 230 is connected to the first output feeder 121 through the first microstrip line 210, and the other end of the intermediate microstrip line 230 is connected to the second output feeder 131 through the second microstrip line 220;

[0055] The extension direction of the middle microstrip line 230 is parallel to the extension direction of the microstrip patch body 100 toward one end edge of the middle microstrip line 230 , and the first microstrip line 210 and the second microstrip line 220 are symmetrically distributed at both ends of the middle microstrip line 230 .

[0056] It should be noted that the straight line where the middle microstrip line 230 is located is parallel to the straight line where the bottom edge of the microstrip patch body 100 is located; the first microstrip line 210 and the second microstrip line 220 are symmetrically distributed at both ends of the middle microstrip line 230, so that the connector 200 as a whole is symmetrically arranged with the symmetry axis of the microstrip patch body 100 through the input port 110 as the center. In this way, the symmetry of signal transmission can be improved.

[0057] Based on this, the isolation resistor 300 includes a first isolation resistor 310 . The first isolation resistor 310 is disposed on the middle microstrip line 230 . The first isolation resistor 310 is located on the symmetry axis of the microstrip patch body 100 through the input port 110 .

[0058] Thus, one of the isolation networks can be implemented on the microstrip patch body 100 , that is, the first output port 120 and the second output port 130 of the first passband can be isolated by the first microstrip line 210 , the second microstrip line 220 , the middle microstrip line 230 and the first isolation resistor 310 .

[0059] For the slots on the microstrip patch body 100, as Figure 1 As shown, in some embodiments, the slot includes a first slot 140, and the first slot 140 is located at one end of the microstrip patch body 100 facing the input port 110;

[0060] The slots also include a second slot 150 and a third slot 160 , both of which are connected to the edge of the microstrip patch body 100 away from the input port 110 , and are symmetrically arranged with the symmetry axis of the microstrip patch body 100 through the input port 110 as the center.

[0061] Specifically, the first slot 140 extends horizontally, is located at one end of the microstrip patch body 100 facing the input port 110 , and is symmetrically arranged around the symmetry axis of the microstrip patch body 100 through the input port 110 .

[0062] The second slot 150 and the third slot 160 both extend vertically, and the lower ends of the second slot 150 and the third slot 160 are both connected to the lower edge of the microstrip patch body 100; the second slot 150 is located at one end of the microstrip patch body 100 facing the first output port 120, and the third slot 160 is located at one end of the microstrip patch body 100 facing the second output port 130; the second slot 150 and the third slot 160 are symmetrically arranged with the symmetry axis of the microstrip patch body 100 through the input port 110 as the center.

[0063] Therefore, the transmission signal can be regulated by the first slot 140 , the second slot 150 and the third slot 160 to improve the overall use effect.

[0064] like Figure 1 As shown, in addition, the slot further includes a fourth slot 170 , which is connected to an edge of the microstrip patch body 100 away from the input port 110 , and the fourth slot 170 is located between the second slot 150 and the third slot 160 .

[0065] The extension direction of the fourth slot 170 is consistent with the extension direction of the symmetry axis of the microstrip patch body 100 through the input port 110 , and the lower end of the fourth slot 170 is connected to the lower edge of the microstrip patch body 100 .

[0066] The slots further include a middle slot 180 , which is located at the center of the microstrip patch body 100 . In addition, the extension direction of the middle slot 180 is consistent with the extension direction of the symmetry axis of the microstrip patch body 100 through the input port 110 .

[0067] Therefore, by symmetrically arranging the perturbation elements (i.e., the first slot 140, the second slot 150, the third slot 160, and the fourth slot 170) in the equilateral triangle microstrip patch body 100, the signal balance and matching of each output port can be ensured, thereby optimizing the use effect.

[0068] In addition, the isolation resistor 300 further includes a plurality of second isolation resistors 320, which are disposed at the portion of the microstrip patch body 100 corresponding to the fourth slot 170. In this embodiment, two second isolation resistors 320 are disposed, and each second isolation resistor 320 is distributed along the extension direction of the fourth slot 170.

[0069] At this time, a second isolation network can be implemented on the microstrip patch body 100 , that is, by loading a plurality of second isolation resistors 320 on the fourth slot 170 , isolation between the first output port 120 and the second output port 130 of the second passband can be achieved.

[0070] In this embodiment, the first slot 140 , the fourth slot 170 , the middle slot 180 and the isolation resistors 300 are all located on the symmetry axis of the microstrip patch body through the input port 110 , thereby further ensuring signal transmission balance, ie, symmetry.

[0071] like Figure 1 As shown, further, at least one metal through hole 190 may be opened on the microstrip patch body 100 , and the metal through hole 190 is located on the symmetry axis of the microstrip patch body 100 through the input port 110 .

[0072] In this embodiment, one metal through hole 190 is provided, and the metal through hole 190 is located between the first slot 140 and the middle slot 180. The metal through hole 190 can further ensure the signal balance and matching of each output port.

[0073] It should be noted that the microstrip patch resonator (i.e., the microstrip patch body 100) can excite multiple resonant modes, such as TM10, TM11, TM21, and TM30 modes. The first slot 140 can affect the resonant frequency of the TM21 mode and the TM30 mode. The longer the first slot 140 is, the lower the resonant frequency of the TM21 mode and the TM30 mode is. The second slot 150 or the third slot 160 can affect the resonant frequency of the TM11 mode and the TM30 mode. The longer the second slot 150 or the third slot 160 is, the lower the resonant frequency of the TM11 mode and the TM30 mode is. The middle slot 180 can affect the resonant frequency of the TM30 mode. The longer the middle slot 180 is, the lower the resonant frequency of the TM30 mode is.

[0074] In addition, the metal via 190 can affect the resonance frequency of the TM10 mode. The larger the radius of the metal via 190 is, the higher the resonance frequency of the TM10 mode is.

[0075] Based on this, the first passband is composed of the TM10 mode and the TM11 mode excited in the microstrip patch resonator, and the second passband is composed of the TM21 mode and the TM30 mode excited in the microstrip patch resonator; these modes originally have different resonant frequencies, and through the response of each slot and the metal through-hole 190, they are combined in pairs to form two filtering passbands.

[0076] In implementation, the present microstrip patch cavity dual-passband filter power divider has a simple structure, is easy to process and integrate, and has low cost. Figure 2According to the simulation and test results of the S parameters in the figure, the center frequencies of the dual-passband filter power divider are 2.6 GHz and 4.85 GHz, and the corresponding 3 dB relative bandwidths are 25% and 9%, respectively. In the passband, the actual measured minimum insertion loss is 0.45 dB and 1.35 dB (excluding the 3 dB power divider loss), while the input port 110 return loss is better than 20 dB and 14 dB, respectively, and the in-band isolation between the output ports is better than 13 dB and 18 dB, respectively. In addition, there is a transmission zero at 3.27, 3.54 and 5.42 GHz outside the passband, which greatly improves the out-of-band selectivity of the circuit and has a better use effect.

[0077] In addition, according to Figure 3 It shows that the phase and amplitude differences between the output ports are less than 2.73 and 5.2 degrees and 0.58 and 0.48 dB respectively in the passband. It should be noted that the error between the test results and the simulation is mainly caused by the processing accuracy error and the patch radiation loss.

[0078] In summary, the microstrip patch cavity dual-passband filter power divider provided in the embodiment of the present application has dual-passband performance, and at the same time, under the action of each slot, a wider frequency band range is achieved; isolation can also be provided between different output ports through the isolation resistor 300, which helps to reduce mutual interference between the output ports and ensure the signal transmission quality; at the same time, the dual-passband filter power divider has a simple structure, is easy to process and integrate, and has low cost; when installing, it can be implemented on a single PCB board, and the installation is convenient; the three-sided symmetry characteristics of the equilateral triangle-shaped microstrip patch resonator can also be used to make full use of the circuit space, greatly reducing the circuit volume, and solving the problems of complex overall structure, difficult processing, and high cost of the filter power divider in the prior art.

[0079] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A microstrip patch cavity dual-passband filter power divider, characterized in that: include: A microstrip patch body (100), the microstrip patch body (100) having an input port (110) and at least two output ports, and a plurality of slots are provided on the microstrip patch body (100); A connecting piece (200), the connecting piece (200) being connected to each of the output ports at the same time; A plurality of isolation resistors (300), wherein the isolation resistors (300) are located between two adjacent output ports, and the isolation resistors (300) are arranged on the microstrip patch body (100) or the connector (200).

2. The microstrip patch cavity dual-passband filter power divider according to claim 1, characterized in that: The at least two output ports include a first output port (120) and a second output port (130); The microstrip patch body (100) is in the shape of an equilateral triangle, one corner of the microstrip patch body (100) being the input port (110), and the other two corners being the first output port (120) and the second output port (130); The input port (110) is connected to an input feeder (111), the first output port (120) is connected to a first output feeder (121), the second output port (130) is connected to a second output feeder (131), and the connecting member (200) is simultaneously connected to the first output feeder (121) and the second output feeder (131).

3. The microstrip patch cavity dual-passband filter power divider according to claim 2, characterized in that: The connecting member (200) comprises a first microstrip line (210), a second microstrip line (220), and an intermediate microstrip line (230); one end of the intermediate microstrip line (230) is connected to the first output feeder line (121) via the first microstrip line (210), and the other end of the intermediate microstrip line (230) is connected to the second output feeder line (131) via the second microstrip line (220); The extension direction of the middle microstrip line (230) is parallel to the extension direction of the microstrip patch body (100) towards an edge of one end of the middle microstrip line (230), and the first microstrip line (210) and the second microstrip line (220) are symmetrically distributed at two ends of the middle microstrip line (230).

4. The microstrip patch cavity dual-passband filter power divider according to claim 3, characterized in that: The isolation resistor (300) comprises a first isolation resistor (310), the first isolation resistor (310) being arranged on the intermediate microstrip line (230), and the first isolation resistor (310) being located on a symmetry axis of the microstrip patch body (100) passing through the input port (110).

5. The microstrip patch cavity dual-passband filter power divider according to claim 2, characterized in that: The slots comprise a first slot (140), wherein the first slot (140) is located at one end of the microstrip patch body (100) facing the input port (110); The slot further comprises a second slot (150) and a third slot (160), the second slot (150) and the third slot (160) both being connected to an edge of the microstrip patch body (100) away from the input port (110), and the second slot (150) and the third slot (160) being symmetrically arranged with the symmetry axis of the microstrip patch body (100) passing through the input port (110) as the center.

6. The microstrip patch cavity dual-passband filter power divider according to claim 5, characterized in that: The slot also includes a fourth slot (170), the fourth slot (170) being connected to an edge of the microstrip patch body (100) away from the input port (110), and the fourth slot (170) being located between the second slot (150) and the third slot (160).

7. The microstrip patch cavity dual-passband filter power divider according to claim 6, characterized in that: The slots also include a middle slot (180), and the middle slot (180) is located at the center of the microstrip patch body (100).

8. The microstrip patch cavity dual-passband filter power divider according to claim 6, characterized in that: The isolation resistor (300) further comprises a plurality of second isolation resistors (320), wherein the second isolation resistors (320) are arranged at a portion of the microstrip patch body (100) corresponding to the fourth slot (170).

9. The microstrip patch cavity dual-passband filter power divider according to claim 7, characterized in that: The first slot (140), the fourth slot (170), the middle slot (180) and each of the isolation resistors (300) are all located on a symmetric axis of the microstrip patch body (100) passing through the input port.

10. The microstrip patch cavity dual-passband filter power divider according to claim 2, characterized in that: At least one metal through hole (190) is provided on the microstrip patch body (100), and the metal through hole (190) is located on a symmetric axis of the microstrip patch body (100) passing through the input port (110).

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