High-isolation multi-path programmable attenuator

Abstract

The utility model discloses a high-isolation multi-path programmable attenuator, which comprises a printed circuit board, the printed circuit board is provided with a plurality of attenuation units, and each attenuation unit comprises an input port connector, an output port connector, a programmable attenuation circuit and a metal shielding cover. The input port connector and the output port connector are oppositely arranged at the two ends of the printed circuit board, the programmable attenuation circuit is electrically connected with the input port connector and the output port connector respectively, and the metal shielding cover covers the attenuation unit. According to the utility model, through the metal shielding cover covering the attenuation unit, the isolation space between every two attenuation channels is ensured, so that the situation of insufficient attenuation proportion caused by insufficient isolation is avoided, and meanwhile, the input port and the output port are both positioned in the metal shielding cover, so that the reliability of the attenuator is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic communications, in particular to a high-isolation multi-path controlled attenuator. Background Art

[0002] Multi-channel controlled attenuator is an important electronic device, which is widely used in communication, radar, electronic countermeasure and other fields. It can accurately control the attenuation of the signal at different frequencies and power levels, thereby adjusting the signal strength.

[0003] In practical applications, the attenuation performance of a multi-channel controlled attenuator is related to the isolation of each channel of the attenuator. The higher the isolation of each channel, the higher the attenuation ratio, and the better the attenuation performance of the attenuator. In order to improve the attenuation performance of the existing multi-channel controlled attenuator, it is necessary to provide a multi-channel controlled attenuator with higher isolation. Utility Model Content

[0004] The technical problem solved by the utility model is to solve the problem that the isolation between channels of the existing multi-channel controlled attenuator is not high and the attenuation performance is insufficient.

[0005] The utility model aims to provide a multi-path controlled attenuator with high isolation.

[0006] An embodiment of the utility model provides a multi-channel controlled attenuator, including a shell, a plurality of input ports on the right side of the shell, a plurality of output ports corresponding to the input ports on the left side of the shell, a printed circuit board is arranged in the shell, a plurality of attenuation units corresponding to the input ports are evenly distributed on the printed circuit board, and a shielding box corresponding to the attenuation unit is also arranged on the printed circuit board, the shielding box is a closed structure, and each attenuation unit is respectively enclosed in its corresponding shielding box.

[0007] In the technical solution described above, by separately arranging a shielding box on each attenuation unit, the isolation of each attenuation channel is increased, thereby improving the attenuation performance of the attenuator. At the same time, the attenuation unit is completely surrounded by the shielding box, ensuring the isolation performance of the shielding box.

[0008] In a preferred embodiment of the present invention, the right end of the attenuation unit is electrically connected to the input port connector, and the left end is electrically connected to the output port connector, and the input port connector and the output port connector cooperate with the input port and the output port on the shell.

[0009] In the technical solution introduced above, each attenuation channel corresponds to an input port and an output port, so that the attenuated signals do not interfere with each other during the input and output process, thereby ensuring the isolation of the attenuated signals in each attenuation channel.

[0010] In a preferred embodiment of the utility model, the programmable attenuation circuit includes 3-4 programmable attenuation chips and 4-5 capacitors. The programmable attenuation chips and the capacitors are alternately arranged, and the programmable attenuation chips and the capacitors are connected via a microstrip circuit.

[0011] In a preferred embodiment of the present utility model, a plurality of rows of staggered grounding holes are provided on the printed circuit board, and the grounding holes are located between the attenuation units.

[0012] In a preferred embodiment of the present invention, the operating frequency of the attenuator is 600 MHz-6 GHz.

[0013] In a preferred embodiment of the present utility model, the printed circuit board is a multi-layer mixed-pressure printed circuit board, including a PTFE dielectric sheet and a FR4 dielectric sheet, wherein the thickness of the PTFE dielectric sheet is 0.127 mm.

[0014] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Various other advantages and benefits will become apparent to those skilled in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only used for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. In addition, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0016] Figure 1 This is a structural schematic diagram of a high-isolation multi-path controlled attenuator provided by the utility model;

[0017] Figure 2 It is a side view of a high isolation multi-path controlled attenuator provided by the utility model;

[0018] Reference numerals:

[0019] 1. Printed circuit board; 2. Input port connector; 3. Output port connector; 4. Attenuation unit; 41. Attenuation chip; 42. Capacitor; 43. Microstrip line; 5. Shielding box; 6. Grounding hole. DETAILED DESCRIPTION

[0020] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0021] See also Figure 1 and Figure 2 , which is a preferred embodiment of the utility model, a high-isolation multi-path controlled attenuator provided by the utility model includes a printed circuit board 1, on which 8 attenuation units 4 are arranged, and each attenuation unit 4 is respectively provided with an input port connector 2 and an output port connector 3 on the left and right, each input port connector 2 is arranged on the right side of the printed circuit board 1, and correspondingly, each output port connector 3 is arranged on the left side of the printed circuit board 1.

[0022] The attenuation unit 4 includes a plurality of attenuation chips 41, capacitors 42 and microstrip lines 43 arranged between the input port connector 2 and the output port connector 3. In this embodiment, the input port connector 2 and the output port connector 3 are connected by the microstrip line 43, and the attenuation chips 41 and capacitors 42 in the attenuation unit 4 are arranged on the microstrip line 43. In this embodiment, the attenuation unit 4 includes three attenuation chips 41 and four capacitors 42. The attenuation chips 41 and capacitors 42 in the attenuation unit 4 are alternately arranged, and the capacitors isolate the DC signal. The capacitors 42 and the attenuation chips 41 are also connected by the microstrip line 43.

[0023] A shielding box 5 is also provided on the printed circuit board. The shielding box 5 is a closed structure. Specifically, in this embodiment, it is a square box made of metal and welded on the printed circuit board. The shielding box 5 completely surrounds the attenuation unit 4. All components of the attenuation unit 4, including the attenuation chip 41, the capacitor 42 and the microstrip line 43, are arranged inside the shielding box 5. The left and right ends of the shielding box are respectively abutted against the input port connector 2 and the output port connector 3, so that each attenuation unit is completely isolated inside the shielding box.

[0024] In a preferred embodiment, it also includes a shell, and the printed circuit board in the above embodiment is arranged inside the shell. A metal isolation structure is arranged on the shell corresponding to each attenuation unit, replacing the shielding box 5 in the above embodiment. The outline of the metal isolation structure is similar to the outline of the shielding box 5, and the metal isolation structure forms an isolation chamber corresponding to each attenuation unit 4 inside the shell, and the two ends of the isolation chamber are connected to the input port connector 2 and the output port connector 3, and the attenuation unit 4 is arranged in the isolation chamber.

[0025] Continue to see Figure 1In this embodiment, the attenuation units 4 are evenly distributed on the printed circuit board 1, and there is a certain gap between adjacent attenuation units 4. In this gap, a plurality of grounding holes 6 are provided on the printed circuit board 1. Specifically, in this embodiment, at least two rows of grounding holes 6 should be provided between adjacent attenuation units 4, and the two rows of grounding holes 6 are arranged alternately. The grounding holes 6 can help reduce signal reflection and improve signal quality. In addition, the grounding holes 6 can also help achieve sufficient good grounding, further improving the isolation of the attenuator.

[0026] Based on the above scheme, the working frequency of the attenuator provided in the embodiment of the utility model is 600MHz-6GHz. In the embodiment of the utility model, the printed circuit board is a multi-layer mixed-pressure circuit board. The circuit board includes at least two layers of sheet materials mixed and pressed, one of which is a FR4 sheet material and the other is a PTFE sheet material. The printed circuit board is made by mixing and pressing the FR4 sheet material and the PTFE sheet material, and the thickness of the PTFE dielectric sheet material is 0.127mm. The surface of the sheet material is gold-plated, and the processing should ensure the accuracy and surface roughness to ensure the high-frequency performance of the attenuator.

[0027] The beneficial effects of the above embodiments include but are not limited to increasing the isolation between the attenuation units by means of the isolation cover provided on the attenuation unit and the grounding hole provided between the attenuation units. The multi-channel controlled attenuator provided by the utility model has the characteristics of wide operating frequency, high isolation, high reliability, easy installation, etc., the attenuator has small inherent loss, stable performance index, flexible connector, and is suitable for multiple frequency band test systems.

[0028] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications fall within the protection scope of the present invention.

Claims

1. A high-isolation multi-channel controlled attenuator, comprising a housing, the right side of the housing having a plurality of input ports, the left side of the housing having a plurality of output ports corresponding to the input ports, and a printed circuit board disposed inside the housing, characterized in that: The printed circuit board is evenly distributed with a plurality of attenuation units corresponding to the input ports. The printed circuit board is also provided with a shielding box corresponding to the attenuation units. The shielding box is a closed structure. Each of the attenuation units is respectively enclosed in the corresponding shielding box.

2. The attenuator according to claim 1, characterized in that The right end of the attenuation unit is electrically connected to the input port connector, and the left end is electrically connected to the output port connector. The input port connector and the output port connector cooperate with the input port and the output port on the shell.

3. The attenuator according to claim 2, characterized in that The attenuation unit comprises 3-4 programmable attenuation chips and 4-5 capacitors. The programmable attenuation chips and the capacitors are arranged alternately, and the programmable attenuation chips and the capacitors are connected via a microstrip circuit.

4. The attenuator according to claim 3, characterized in that The printed circuit board is provided with a plurality of rows of staggered grounding holes, and the grounding holes are located between the attenuation units.

5. The attenuator according to claim 4, characterized in that The operating frequency of the attenuator is 600MHz-6GHz.

6. The attenuator according to claim 5, characterized in that The printed circuit board is a multi-layer mixed-pressure printed circuit board, including a PTFE dielectric sheet and an FR4 dielectric sheet, wherein the thickness of the PTFE dielectric sheet is 0.127 mm.

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