Microstrip combiner and filter

Abstract

The utility model provides a microstrip combiner which comprises a converter, a first branch, a second branch and an isolation resistor. One end of the converter is connected with a signal source, and the other end of the converter is respectively connected with the first branch and the second branch; the first branch continuously bends and extends, and one end, far away from the converter, of the first branch is connected with a filter circuit; the second branch and the first branch are symmetrically distributed relative to the isolation resistor, and two ends of the isolation resistor are respectively connected with the first branch and the second branch. Input signals are uniformly distributed and output through the bending shapes of the first branch and the second branch, and the isolation resistor is connected with the first branch and the second branch to reduce mutual crosstalk between ports, so that the isolation degree between the output ports of the whole combiner is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to base station antenna technical field, especially relate to a kind of microstrip combiner and filter. BACKGROUND

[0002] Microstrip combiner is a kind of passive microwave device widely used in communication and radio frequency field, it can evenly distribute one input signal into multiple output signals, while maintaining good amplitude and phase balance. At present, microstrip combiner generally exists between multiple signals easy to appear mutual crosstalk, thereby affecting the isolation of combiner problem. SUMMARY

[0003] In order to solve the problem that multiple signals easy to appear mutual crosstalk between in the background art, thereby affecting the isolation of combiner, the utility model provides the following technical scheme:

[0004] A kind of microstrip combiner, comprising: transformer, first branch, second branch and isolation resistance;The one end of the transformer is connected with signal source, the other end of the transformer is connected with the first branch and the second branch respectively;The first branch is continuously bent and extended, and the one end of the first branch away from the transformer is connected with filter circuit;The second branch and the first branch are symmetrically distributed about the isolation resistance, and the two ends of the isolation resistance are connected with the first branch and the second branch respectively.

[0005] Among them, the first branch includes: first stub, second stub and third stub;The one side of the first stub is connected with the transformer, and the other side of the first stub is connected with the one side of the second stub;The one side of the third stub is connected with the other side of the second stub, and the other side of the third stub is connected with the filter circuit.

[0006] Further, the second branch includes: fourth stub, fifth stub and sixth stub;The one side of the fourth stub is connected with the transformer, and the other side of the fourth stub is connected with the one side of the fifth stub;The one side of the sixth stub is connected with the other side of the fifth stub, and the other side of the sixth stub is connected with the filter circuit.

[0007] Further, the line width of the first stub is less than the line width of the second stub, and the line width of the third stub is greater than the line width of the second stub.

[0008] Further, the line width of the fourth stub is less than the line width of the fifth stub, and the line width of the sixth stub is greater than the line width of the fifth stub.

[0009] Further, the one side of the transformer away from the first branch and the second branch is also provided with Π type attenuator.

[0010] Another purpose of the utility model lies in providing a filter comprising the microstrip coupling structure.

[0011] Beneficial effect: the utility model discloses a first branch and the second branch's bending shape is output even distribution with input signal, and the isolation resistance connects the first branch and the second branch to reduce the mutual crosstalk between the port, thereby improving the isolation degree between the output port of entire combiner. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a microstrip combiner structure schematic diagram according to the utility model embodiment. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical scheme and advantage of the present application more clear, the utility model will be further described in detail below with the drawings. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0014] It needs to be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the patent and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the patent.

[0015] Figure 1 It is a microstrip combiner structure schematic diagram according to the utility model embodiment.

[0016] Referring to Figure 1 A microstrip combiner according to the utility model embodiment comprises a transformer 1, a first branch 2, a second branch 3 and an isolation resistance 4. Among them, the transformer 1 is connected with a signal source and the first branch 2, the second branch 3, to input external signals into the first branch 2 and the second branch 3 respectively. The first branch 2 is continuously bent and extended, and the end of the first branch 2 away from the transformer 1 is connected with a filter circuit. The second branch 3 is symmetrically distributed with the first branch 2 about the isolation resistance 4, and the two ends of the isolation resistance 4 are connected with the first branch 2 and the second branch 3 respectively, to reduce the mutual interference between the output ports.

[0017] Specifically, the first branch 2 is in the shape of a bent rectangular wave, and the first branch 2 comprises a first branch 21, a second branch 22 and a third branch 23. One end of the first branch 21 is connected to the transformer 1, and the other end of the first branch 21 is connected to one end of the second branch 22. One end of the third branch 23 is connected to the other end of the second branch 22, and the other end of the third branch 23 is connected to the filter circuit. The line width of the first branch 21 is smaller than the line width of the second branch 22, and the line width of the second branch 22 is smaller than the line width of the third branch 23. Preferably, in the embodiment, the isolation resistor 4 is a thin film resistor.

[0018] Further, the vertical part of the first branch 21 is connected to the transformer 1 perpendicularly, and the horizontal part of the first branch 21 is parallel to the transformer 1. The second branch 3 comprises a fourth branch 31, a fifth branch 32 and a sixth branch 33. The fourth branch 31 is symmetrical to the first branch 21 about the isolation resistor 4, the fifth branch 32 is symmetrical to the second branch about the isolation resistor 4, and the sixth branch 33 is symmetrical to the third branch 23 about the isolation resistor 4. Similarly, the line width of the fourth branch 31 is smaller than the line width of the fifth branch 32, and the line width of the fifth branch 32 is smaller than the line width of the sixth branch 33.

[0019] Further, in order to improve the impedance matching effect of the whole circuit, in the embodiment, a Π attenuator is arranged at the connection between the transformer 1 and the first branch 2 and the second branch 3. The transformer 1 is a microstrip transmission line with a quarter wavelength length, and the line width of the transformer 1 is equal to the width of the third branch 23. In addition, in the embodiment, the filter circuit is an LC filter circuit, and one filter circuit is arranged on the sixth branch 33 and the third branch 23 respectively. Through the action of the filter circuit, on the one hand, the isolation parameter of the whole combiner is improved, and on the other hand, the frequency characteristic and the time domain characteristic of the output signal are further optimized.

[0020] Another purpose of the utility model is to propose a filter structure comprising the above microstrip combiner.

[0021] In summary, the utility model discloses the shape of the first branch and the second branch is bent, and the isolation resistor is connected to the first branch and the second branch to reduce the mutual interference between the ports, thereby improving the isolation of the whole combiner.

[0022] The above describes specific embodiments of the utility model. Other embodiments are within the scope of the appended claims.

[0023] The terms "exemplary," "example," and the like are used as adjectives to indicate that something is used as an example, instance, or illustration. The terms do not necessarily convey a preference or advantage over other embodiments. The detailed description includes specific details for the purpose of providing a thorough understanding of the described technology. However, the technology can be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described embodiments.

[0024] The above describes optional implementation manners of the embodiments of the present application in combination with the drawings, but the embodiments of the present application are not limited to the specific details in the above implementation manners, and various simple modifications can be made to the technical solutions of the embodiments of the present application within the technical concept scope of the embodiments of the present application, and these simple modifications all belong to the protection scope of the embodiments of the present application.

[0025] The above description of the content of the present specification is provided so that any ordinary person skilled in the art can implement or use the content of the present specification. Various modifications to the content of the present specification are obvious to those skilled in the art, and the general principles defined herein can also be applied to other variants without departing from the protection scope of the content of the present specification. Therefore, the content of the present specification is not limited to the examples and designs described herein, but is consistent with the broadest scope that meets the principles and novel features disclosed herein.

Claims

1. A microstrip hybrid coupler, characterized by The utility model provides a microstrip combiner, which comprises a transformer (1), a first branch (2), a second branch (3) and an isolation resistor (4). One end of the transformer (1) is connected with a signal source, and the other end of the transformer (1) is connected with the first branch (2) and the second branch (3) respectively; the first branch (2) is continuously bent and extended, and one end of the first branch (2) away from the transformer (1) is connected with a filter circuit; the second branch (3) and the first branch (2) are symmetrically distributed about the isolation resistor (4), and the two ends of the isolation resistor (4) are connected with the first branch (2) and the second branch (3) respectively. The first branch (2) comprises a first branch (21), a second branch (22) and a third branch (23); one side of the first branch (21) is connected with the transformer (1), and the other side of the first branch (21) is connected with one side of the second branch (22); one side of the third branch (23) is connected with the other side of the second branch (22), and the other side of the third branch (23) is connected with the filter circuit.

2. A microstrip hybrid according to claim 1, wherein The second branch (3) comprises a fourth branch (31), a fifth branch (32) and a sixth branch (33); one side of the fourth branch (31) is connected with the transformer (1), and the other side of the fourth branch (31) is connected with one side of the fifth branch (32); one side of the sixth branch (33) is connected with the other side of the fifth branch (32), and the other side of the sixth branch (33) is connected with the filter circuit.

3. A microstrip hybrid according to claim 2, wherein The line width of the first branch (21) is smaller than the line width of the second branch (22), and the line width of the third branch (23) is larger than the line width of the second branch (22).

4. A microstrip hybrid according to claim 3, wherein The line width of the fourth branch (31) is smaller than the line width of the fifth branch (32), and the line width of the sixth branch (33) is larger than the line width of the fifth branch (32).

5. A microstrip hybrid according to claim 4, wherein The transformer (1) is further provided with a Π type attenuator away from the first branch (2) and the second branch (3).

6. A microstrip hybrid according to claim 4, wherein The utility model provides a microstrip combiner, which comprises a transformer (1), a first branch (2), a second branch (3) and an isolation resistor (4).

7. A filter, characterized by ​

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