Microstrip combiner device and base station antenna

Abstract

The utility model provides a micro-strip combiner device and a base station antenna, the micro-strip combiner device comprises a circuit board, micro-strip combiners and isolation metal sheets, the micro-strip combiners are distributed on the circuit board and at least comprise two branch lines, and the isolation metal sheets are installed on the circuit board and located between the two adjacent branch lines. By arranging the isolation metal sheets between the branch lines of the microstrip combiner, signal crosstalk of the branch lines can be avoided, the isolation degree of the microstrip combiner is improved, and meanwhile the device is simple in structure and low in manufacturing cost.

Description

Technical Field

[0001] The present application belongs to the technical field of communication equipment, and in particular, relates to a microstrip combiner device and a base station antenna. Background Art

[0002] Microstrip combiners are passive microwave devices widely used in the fields of communications and radio frequency. They can evenly distribute an input signal into multiple output signals while maintaining good amplitude and phase balance. A common problem with microstrip combiners is that multiple signals are prone to crosstalk, which affects the isolation of the combiner. Utility Model Content

[0003] The technical problem solved by the present application is: how to improve the isolation of a microstrip combiner device.

[0004] The present application provides a microstrip combiner device, which includes a circuit board, a microstrip combiner and an isolation metal sheet. The microstrip combiner is distributed on the circuit board and includes at least two branch lines. The isolation metal sheet is installed on the circuit board and is located between two adjacent branch lines.

[0005] Optionally, the microstrip combiner includes a first branch line and a second branch line, the first branch line and the second branch line share an input port, the output port of the first branch line and the output port of the second branch line are spaced apart, and the isolation metal sheet is located between the first branch line and the second branch line.

[0006] Optionally, the microstrip combiner further includes an isolation resistor, and the isolation resistor is welded to an output port of the first branch line and an output port of the second branch line.

[0007] Optionally, the first branch line and the second branch line are symmetrically arranged with respect to the isolation metal sheet, and the first branch line and the second branch line each include an input port line, a blocking conversion line and an output port line connected in sequence.

[0008] Optionally, a plurality of fixed terminals are provided at the bottom of the isolation metal sheet, and the fixed terminals are welded to the circuit board.

[0009] Optionally, the fixed terminal is a conductor, and the fixed terminal is respectively connected to the ground of the isolation metal sheet and the circuit board.

[0010] Optionally, the fixed terminal is provided with an avoidance groove, and the branch line passes through the avoidance groove.

[0011] Optionally, the isolation metal sheet is a copper sheet.

[0012] The present application also provides a base station antenna, which includes the above-mentioned microstrip combiner device.

[0013] The present application provides a microstrip combiner device, which has the following technical effects:

[0014] By arranging isolation metal sheets between branch lines of a microstrip combiner, signal crosstalk in the branch lines can be avoided, and the isolation of the microstrip combiner can be improved. At the same time, the device has a simple structure and a low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of a microstrip combiner device according to one or more embodiments;

[0016] Figure 2 is a diagram of isolation test data of a microstrip combiner device according to one or more embodiments;

[0017] Figure 3 The figure is a diagram of isolation test data of a microstrip combiner equipped with an isolation metal sheet according to one or more embodiments.

[0018] The corresponding relationship between the reference numerals and the component names is as follows:

[0019] 10-circuit board, 11-welding groove, 20-microstrip combiner, 21-first branch line, 22-second branch line, 23-isolation resistor, 30-isolation metal sheet, 31-fixed terminal. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] Before describing the various embodiments of the present application in detail, the technical concept of the present application is briefly described first: the current microstrip combiner device has the problem of poor isolation due to the crosstalk between multiple signals. To this end, the present application provides a microstrip combiner device, in which an isolation metal sheet is added between each branch line of the microstrip combiner. The isolation metal sheet can prevent signal crosstalk between the branch lines, thereby improving the isolation of the microstrip combiner. The specific principle of the microstrip combiner device of the present application is described below in combination with more embodiments.

[0022] Specifically, Figure 1As shown, the microstrip combiner device of the first embodiment includes a circuit board 10, a microstrip combiner 20 and an isolation metal sheet 30. The microstrip combiner 20 is distributed on the circuit board 10 and includes at least two branch lines. The isolation metal sheet 30 is installed on the circuit board 10 and is located between two adjacent branch lines. Exemplarily, the circuit board 10 here is a PCB board, the microstrip combiner 20 is soldered on the circuit board 10, and the number of branch lines is set according to actual needs.

[0023] In one or more embodiments, the microstrip combiner 20 includes a first branch line 21 and a second branch line 22, the first branch line 21 and the second branch line 22 share an input port, the output port of the first branch line 21 and the output port of the second branch line 22 are spaced apart, and the isolation metal sheet 30 is located between the first branch line 21 and the second branch line 22.

[0024] The isolation metal sheet 30 can isolate most of the signal crosstalk between the first branch line 21 and the second branch line 22. The microstrip combiner 20 further includes an isolation resistor 23, which is welded to the output port of the first branch line 21 and the output port of the second branch line 22. The isolation between the two output ports can be increased by the isolation resistor 23. Exemplarily, the isolation resistor 23 can be a thin film resistor.

[0025] In one or more embodiments, the first branch line 21 and the second branch line 22 are symmetrically arranged about the isolation metal sheet 30, and the first branch line 21 and the second branch line 22 both include an input port line, an impedance transformation line, and an output port line connected in sequence, and the impedance transformation line is a meandering line. Exemplarily, the length of the first branch line 21 and the second branch line 22 is a quarter wavelength of the antenna radiation signal.

[0026] Furthermore, a plurality of fixed terminals 31 are provided at the bottom of the isolation metal sheet 30, and the fixed terminals 31 are welded to the circuit board 10, so that the isolation metal sheet 30 is installed on the circuit board 10. Exemplarily, the number of the fixed terminals 31 is four, and two fixed terminals 31 are respectively provided on both sides of the isolation metal sheet 30 to improve the installation stability of the isolation metal sheet 30.

[0027] Exemplarily, the fixed terminal 31 is a conductor, and the fixed terminal 31 is respectively connected to the ground of the isolation metal sheet 30 and the circuit board 10, thereby achieving grounding of the isolation metal sheet 30. In one or more embodiments, a partial area of ​​the circuit board 10 is etched to form a welding groove 11, and the welding groove 11 exposes the copper layer (grounding layer). When the fixed terminal 31 is welded to the welding groove 11, the fixed terminal 31 is connected to the copper layer, thereby achieving grounding of the isolation metal sheet 30.

[0028] Furthermore, the fixed terminal 31 is provided with an avoidance groove, and the branch circuit passes through the avoidance groove. In one embodiment, the branch circuit is distributed between the welding groove 11 and the isolation metal sheet 30, and under the action of the avoidance groove, the fixed terminal 31 crosses the branch circuit to avoid contact between the fixed terminal 31 and the branch circuit.

[0029] In one or more embodiments, the isolation metal sheet 30 is a copper sheet, and the fixed terminal 31 is a copper terminal.

[0030] The second embodiment further discloses a base station antenna, which includes the microstrip combiner device as described in the first embodiment.

[0031] In order to prove the isolation improvement effect of the isolation metal sheet on the microstrip combiner, this embodiment conducted a comparative test. The test objects were the microstrip combiner device with the isolation metal sheet installed and the microstrip combiner without the isolation metal sheet installed. The test results were as follows: Figure 2 and Figure 3 As shown, the horizontal axis in the figure represents the signal frequency, and the vertical axis represents the signal strength. It can be seen that the isolation of the microstrip combiner device with the isolation metal sheet is higher.

[0032] In summary, the microstrip combiner device and base station antenna provided in this embodiment can avoid signal crosstalk in the branch lines by setting isolation metal sheets between the branch lines of the microstrip combiner, thereby improving the isolation of the microstrip combiner. At the same time, the device has a simple structure and a low manufacturing cost.

[0033] The specific implementation methods of the present application are described in detail above. Although some embodiments have been shown and described, those skilled in the art should understand that these embodiments can be modified and improved without departing from the principles and spirit of the present application whose scope is defined by the claims and their equivalents. These modifications and improvements should also be within the scope of protection of the present application.

Claims

1. A microstrip combiner device, characterized in that: The microstrip combiner device includes a circuit board, a microstrip combiner and an isolation metal sheet. The microstrip combiner is distributed on the circuit board and includes at least two branch lines. The isolation metal sheet is installed on the circuit board and is located between two adjacent branch lines.

2. The microstrip combiner device according to claim 1, characterized in that: The microstrip combiner includes a first branch line and a second branch line, the first branch line and the second branch line share an input port, the output port of the first branch line is spaced from the output port of the second branch line, and the isolation metal sheet is located between the first branch line and the second branch line.

3. The microstrip combiner device according to claim 2, characterized in that: The microstrip combiner further includes an isolation resistor, and the isolation resistor is welded to an output port of the first branch line and an output port of the second branch line.

4. The microstrip combiner device according to claim 3, characterized in that: The first branch line and the second branch line are symmetrically arranged with respect to the isolation metal sheet, and both the first branch line and the second branch line include an input port line, a blocking conversion line and an output port line connected in sequence.

5. The microstrip combiner device according to claim 1, characterized in that: A plurality of fixed terminals are arranged at the bottom of the isolation metal sheet, and the fixed terminals are welded to the circuit board.

6. The microstrip combiner device according to claim 5, characterized in that: The fixed terminal is a conductor, and the fixed terminal is respectively connected to the ground of the isolation metal sheet and the circuit board.

7. The microstrip combiner device according to claim 5, characterized in that: The fixed terminal is provided with an escape groove, and the branch line passes through the escape groove.

8. The microstrip combiner device according to claim 1, characterized in that: The isolation metal sheet is a copper sheet.

9. A base station antenna, characterized in that: The base station antenna comprises the microstrip combiner device according to any one of claims 1 to 8.

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