A microstrip patch cavity dual-band filtering power divider

Abstract

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

Description

Technical Field

[0001] This application relates to the technical field of filter power dividers, and more particularly to a microstrip patch cavity dual-passband filter power divider. Background Technology

[0002] Filters and power dividers are indispensable components of wireless network communication systems. A filter-power divider integrates the functions of both into one component.

[0003] In related technologies, most power dividers are implemented using microstrip or waveguides. Examples include power dividers for satellite communication using microstrip coupling lines, high-selectivity power dividers with three transmission zeros, and dual-passband power dividers based on substrate-integrated waveguide resonators.

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

[0005] This application provides a microstrip patch cavity dual-passband filter power divider to solve the problems of complex overall structure, high manufacturing difficulty, and high cost of existing filter power dividers.

[0006] This application provides a dual-passband filter power divider, including:

[0007] A microstrip patch body, the microstrip patch body having an input port and at least two output ports, and the microstrip patch body having a plurality of slots;

[0008] A connector, which is simultaneously connected to each of the output ports;

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

[0010] In one possible implementation, at least two of the output ports are provided to include a first output port and a second output port;

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

[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 connector is connected to both the first output feeder and the second output feeder.

[0013] In one possible implementation, the connector includes a first microstrip line, a second microstrip line, and an intermediate microstrip line, one end of the intermediate microstrip line being connected to the first output feed line via the first microstrip line, and the other end of the intermediate microstrip line being connected to the second output feed line via the second microstrip line.

[0014] The extension direction of the intermediate microstrip line is parallel to the extension direction of the microstrip patch body toward one edge of the intermediate microstrip line, and the first microstrip line and the second microstrip line are symmetrically distributed at both ends of the intermediate microstrip line.

[0015] In one possible implementation, the isolation resistor includes a first isolation resistor disposed on the intermediate microstrip line, the first isolation resistor being located on the axis of symmetry of the microstrip patch body through the input port.

[0016] In one possible implementation, the slot includes a first slot 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, both of which are connected to the edge of the microstrip patch body away from the input port. The second slot and the third slot are symmetrically arranged with the axis of symmetry of the microstrip patch body through the input port as the center.

[0018] In one possible implementation, the slot further includes a fourth slot that communicates with the 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 one possible implementation, the slot further includes an intermediate slot located at the center of the microstrip patch body.

[0020] In one possible implementation, the isolation resistor further includes a plurality of second isolation resistors disposed on the microstrip patch body at the location corresponding to the fourth slot.

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

[0022] In one possible implementation, the microstrip patch body has at least one metal through-hole, which is located on the axis of symmetry of the microstrip patch body through the input port.

[0023] This application provides a microstrip patch cavity dual-passband filter power divider, which comprises: a microstrip patch body having an input port and at least two output ports, and several slots on the microstrip patch body; connectors connected to each output port; and several isolation resistors located between adjacent output ports, with the isolation resistors disposed on the microstrip patch body or the connectors. Therefore, this microstrip patch cavity dual-passband filter power divider possesses dual-passband performance and achieves a wide frequency band range due to the slots; it also provides inter-port isolation through the isolation resistors, helping to reduce mutual interference between output ports and ensuring signal transmission quality; simultaneously, this microstrip patch cavity dual-passband filter power divider has a simple structure, is easy to manufacture and integrate, and has low cost; during installation, it can be implemented on a single PCB board, making installation convenient; it also makes full use of circuit space, greatly reducing the circuit volume, and solves the problems of complex overall structure, high manufacturing difficulty, and high cost of existing filter power dividers. Attached Figure Description

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

[0025] Figure 1 This application provides a schematic diagram of the structure of a microstrip patch cavity dual-passband filter power divider.

[0026] Figure 2 for Figure 1 Simulation and test results of S-parameters of a micro-strip patch cavity dual-passband filter power divider;

[0027] Figure 3 for Figure 1 Simulation and test results of parameters for the first and second passbands of the micro-strip patch cavity dual-passband filter power divider.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100 - Microstrip patch body; 110 - Input port; 111 - Input feed line; 120 - First output port; 121 - First output feed line; 130 - Second output port; 131 - Second output feed line; 140 - First slot; 150 - Second slot; 160 - Third slot; 170 - Fourth slot; 180 - Intermediate slot; 190 - Metal via;

[0030] 200 - Connector; 210 - First microstrip line; 220 - Second microstrip line; 230 - Intermediate microstrip line;

[0031] 300 - Isolation resistor; 310 - First isolation resistor; 320 - Second isolation resistor.

[0032] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0033] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0034] In related technologies, filters and power dividers are indispensable components of wireless network communication systems, and a filter power divider integrates the functions of both into a single component. Typically, filter power dividers are mostly implemented using microstrip or waveguide structures.

[0035] For example, the filtering power divider for satellite communication using microstrip coupled lines and the high-selectivity filtering power divider with three transmission zeros are affected by the quality factor, resulting in less than ideal insertion loss and complex structure; the dual-passband filtering power divider based on substrate integrated waveguide resonators has good isolation, but using higher-order modes in this design leads to excessively large overall size and complex structure.

[0036] Therefore, all of the above dual-passband filter power dividers have the following disadvantages: complex overall structure, difficult manufacturing, and high cost.

[0037] Therefore, this application provides a microstrip patch cavity dual-passband filter power divider, which comprises: a microstrip patch body having an input port and at least two output ports, and a plurality of slots on the microstrip patch body; connectors connected to each output port; and a plurality of isolation resistors located between adjacent output ports, the isolation resistors being disposed on the microstrip patch body or the connectors. Thus, this microstrip patch cavity dual-passband filter power divider possesses dual-passband performance, and achieves a wide frequency band range due to the action of each slot; it also provides inter-port isolation through the isolation resistors, helping to reduce mutual interference between output ports and ensuring signal transmission quality; simultaneously, this dual-passband filter power divider has a simple structure, is easy to process and integrate, and has low cost; during installation, it can be implemented on a single PCB board, making installation convenient; it also makes full use of circuit space, greatly reducing the circuit volume, and solves the problems of complex overall structure, high processing difficulty, and high cost of existing filter power dividers.

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

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

[0040] The microstrip patch body 100 has an input port 110 and at least two output ports, and the microstrip patch body 100 is provided with a number of slots.

[0041] Connector 200 is connected to each output port simultaneously;

[0042] Several isolation resistors 300 are located between two adjacent output ports and are disposed on the microstrip patch body 100 or connector 200.

[0043] Specifically, the microstrip patch body 100 is an equilateral triangular-shaped microstrip patch resonator, see [link / reference]. Figure 1 The microstrip patch body 100 is vertically oriented, with the upper corner of the microstrip patch body 100 being the apex corner and the two lower corners being the base corners. In implementation, several holes can be etched into the microstrip patch body 100 to form slots. Other methods can also be used to fabricate slots in the microstrip patch body 100; there are no limitations on this. The slots extend the operating bandwidth of the microstrip patch body 100, allowing it to adapt to a wider frequency range while providing better filtering performance.

[0044] In this embodiment, there is one input port 110 and two output ports. Of course, in other embodiments, the number of output ports or input ports 110 can be set to other quantities.

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

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

[0048] An 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. The isolation resistor 300 provides isolation between the first output port 120 and the second output port 130, helping to reduce mutual interference between the output ports and ensuring signal transmission quality.

[0049] Therefore, this microstrip patch cavity dual-passband filter power divider possesses dual-passband performance and achieves a wide frequency range through the action of each slot. Furthermore, it provides inter-port isolation through a 300Ω isolation resistor, helping to reduce mutual interference between output ports and ensuring signal transmission quality. Simultaneously, this dual-passband filter power divider has a simple structure, is easy to manufacture and integrate, and has low cost. During installation, it can be implemented on a single PCB board, making installation convenient. Moreover, it utilizes the triangular symmetry of the equilateral triangular microstrip patch resonator to fully utilize circuit space, greatly reducing circuit volume and solving the problems of complex overall structure, high manufacturing difficulty, and high cost of existing filter power dividers.

[0050] In practice, for example, this microstrip patch cavity dual-passband filter power divider can be applied to an indoor distribution system, which can significantly improve the coverage and signal quality of the indoor wireless network and provide users with a better communication experience.

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

[0052] The two ends of the connector 200 are connected to the first output feed line 121 and the second output feed line 131, respectively. In practice, the input feed line 111, the first output feed line 121, and the second output feed line 131 can be connected to external circuits, which helps to improve the convenience of actually connecting this microstrip patch cavity dual-passband filter power divider to the circuit.

[0053] It should be noted that, during implementation, the extensions of the input feed line 111, the first output feed line 121, and the second output feed line 131 can be intersected at the center point of the microstrip patch body 100 in order to make full use of the trilateral 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 feed line 121 through the first microstrip line 210, and the other end of the intermediate microstrip line 230 is connected to the second output feed line 131 through the second microstrip line 220.

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

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

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

[0058] Thus, one type of isolation network can be implemented on the microstrip patch body 100, namely, isolation between the first output port 120 and the second output port 130 of the first passband is achieved by the first microstrip line 210, the second microstrip line 220, the intermediate microstrip line 230 and the first isolation resistor 310.

[0059] For the slots on the microstrip patch body 100, such as Figure 1 As shown, in some embodiments, the slot includes a first slot 140 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 the second slot 150 and the third slot 160 are connected to the edge of the microstrip patch body 100 away from the input port 110. The second slot 150 and the third slot 160 are symmetrically arranged with the axis of symmetry of the microstrip patch body 100 through the input port 110 as the center.

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

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

[0063] Therefore, the transmission signal can be adjusted through the first slot 140, the second slot 150 and the third slot 160 to improve the overall performance.

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

[0065] The fourth slot 170 extends in the same direction as the axis of symmetry of the microstrip patch body 100 via 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 slot also includes an intermediate slot 180, which is located at the center of the microstrip patch body 100. Furthermore, the extension direction of the intermediate slot 180 is consistent with the extension direction of the axis of symmetry of the microstrip patch body 100 through the input port 110.

[0067] Therefore, by symmetrically arranging each perturbation element (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 guaranteed, thereby optimizing the usage effect.

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

[0069] At this point, a second type of isolation network can be implemented on the microstrip patch body 100, namely, by loading several 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 intermediate slot 180, and each isolation resistor 300 are all located on the axis of symmetry of the microstrip patch body through the input port 110, thus further ensuring signal transmission balance, i.e., symmetry.

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

[0072] In this embodiment, a single metal via 190 is provided, and the metal via 190 is located between the first slot 140 and the intermediate slot 180. This metal via 190 further ensures signal balance and matching at 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 frequencies of the TM21 and TM30 modes; the longer the first slot 140, the lower the resonant frequencies of the TM21 and TM30 modes. The second slot 150 or the third slot 160 can affect the resonant frequencies of the TM11 and TM30 modes; the longer the second slot 150 or the third slot 160, the lower the resonant frequencies of the TM11 and TM30 modes. The intermediate slot 180 can affect the resonant frequency of the TM30 mode; the longer the intermediate slot 180, the lower the resonant frequency of the TM30 mode.

[0074] Furthermore, the metal via 190 can affect the resonant frequency of the TM10 mode; the larger the radius of the metal via, the higher the resonant frequency of the TM10 mode.

[0075] Based on this, the first passband consists of the TM10 and TM11 modes excited in the microstrip patch resonator, and the second passband consists of the TM21 and TM30 modes excited in the microstrip patch resonator. These modes have different resonant frequencies, and through the response of each slot and metal via 190, they are combined in pairs to form two filter passbands.

[0076] In implementation, this microstrip patch cavity dual-passband filter power divider is simple in structure, easy to manufacture and integrate, and low in cost. For example, see [link to example]. Figure 2Simulation and test results of the S-parameters show that the center frequencies of the dual-passband filter power divider are 2.6 GHz and 4.85 GHz, with corresponding 3 dB relative bandwidths of 25% and 9%. Within the passband, the measured minimum insertion losses are 0.45 dB and 1.35 dB (excluding 3 dB power divider loss), respectively. Meanwhile, the return losses at the input ports are 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. Furthermore, there are transmission zeros at 3.27, 3.54, and 5.42 GHz outside the passband, which significantly improves the out-of-band selectivity of the circuit, resulting in excellent performance.

[0077] In addition, according to Figure 3 The results show 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, within the passband. It should be noted that the errors between the test results and the simulation are mainly caused by manufacturing accuracy errors and patch radiation losses.

[0078] In summary, the microstrip patch cavity dual-passband filter power divider provided in this application embodiment possesses dual-passband performance and achieves a wide frequency band range under the action of each slot. Furthermore, isolation between different output ports can be provided through the isolation resistor 300, which helps reduce mutual interference between output ports and ensures signal transmission quality. Meanwhile, this dual-passband filter power divider has a simple structure, is easy to process and integrate, and has low cost. During installation, it can be implemented on a single PCB board, making installation convenient. Moreover, it can fully utilize the triangular symmetry characteristics of the equilateral triangular shape of the microstrip patch resonator, making full use of circuit space and greatly reducing the circuit volume. This solves the problems of complex overall structure, high processing difficulty, and high cost of existing filter power dividers.

[0079] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A microstrip patch cavity dual-passband filter power divider, characterized in that, include: The microstrip patch body (100) has an input port (110) and at least two output ports, and the microstrip patch body (100) is provided with a plurality of slots; A connector (200) is simultaneously connected to each of the output ports; A plurality of isolation resistors (300) are provided between two adjacent output ports, and the isolation resistors (300) are disposed on the microstrip patch body (100) or the connector (200). The slot includes a first slot (140) located at one end of the microstrip patch body (100) facing the input port (110); The slot also includes a second slot (150) and a third slot (160). The second slot (150) and the third slot (160) are both connected to the edge of the microstrip patch body (100) away from the input port (110). The second slot (150) and the third slot (160) are symmetrically arranged with the axis of symmetry of the microstrip patch body (100) through the input port (110) as the center.

2. The microstrip patch cavity dual-passband filter power divider according to claim 1, characterized in that, At least two of the output ports include a first output port (120) and a second output port (130); The microstrip patch body (100) is an equilateral triangle shape. One corner of the microstrip patch body (100) is the input port (110), and the other two corners are the first output port (120) and the second output port (130), respectively. The input port (110) is connected to an input feed line (111), the first output port (120) is connected to a first output feed line (121), the second output port (130) is connected to a second output feed line (131), and the connector (200) is connected to both the first output feed line (121) and the second output feed line (131).

3. The microstrip patch cavity dual-passband filter power divider according to claim 2, characterized in that, 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 feed line (121) through the first microstrip line (210), and the other end of the intermediate microstrip line (230) is connected to the second output feed line (131) through the second microstrip line (220). The extension direction of the intermediate microstrip line (230) is parallel to the extension direction of the microstrip patch body (100) toward one end edge of the intermediate microstrip line (230), and the first microstrip line (210) and the second microstrip line (220) are symmetrically distributed at both ends of the intermediate microstrip line (230).

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

5. The microstrip patch cavity dual-passband filter power divider according to claim 1, characterized in that, The slot also includes a fourth slot (170), which is connected to the edge of the microstrip patch body (100) away from the input port (110) and is located between the second slot (150) and the third slot (160).

6. The microstrip patch cavity dual-passband filter power divider according to claim 5, characterized in that, The slot also includes an intermediate slot (180), which is located at the center of the microstrip patch body (100).

7. The microstrip patch cavity dual-passband filter power divider according to claim 5, characterized in that, The isolation resistor (300) also includes a plurality of second isolation resistors (320), which are disposed on the microstrip patch body (100) at the location corresponding to the fourth slot (170).

8. The microstrip patch cavity dual-passband filter power divider according to claim 6, characterized in that, The first slot (140), the fourth slot (170), the intermediate slot (180), and each of the isolation resistors (300) are all located on the axis of symmetry of the microstrip patch body (100) through the input port.

9. 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 the axis of symmetry of the microstrip patch body (100) through the input port (110).

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