Self-correcting radio frequency button high-frequency performance test tool and test method

Abstract

The present application relates to printed circuit board technical field, specifically to a kind of self-correcting type radio frequency hair button high-frequency performance test tool and test method, including a PCB board, hair button connector, first coaxial radio frequency connector head and second coaxial radio frequency connector head, the PCB board includes first signal trace, two signal vias, two groups of ground via group and four positioning holes, signal via is used to connect the inner plug of first coaxial radio frequency connector head and the inner plug of second coaxial radio frequency connector head, the ground via group is arranged in C type, the second coaxial radio frequency connector head is fixed on PCB board, the hair button connector is detachably installed between first coaxial radio frequency connector head and PCB board, the hair button connector includes shell and insulator, and the insulator has circular opening for placing hair button contact body in the center.The present application has the advantages of tool structure simplification, reduce high-frequency energy leakage, test convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printed circuit board, and particularly relates to a self-calibration type radio frequency hair button high-frequency performance test tool and test method. BACKGROUND

[0002] The PCB is also called printed circuit board, and the SMA (Sub-Miniature-A) head is also called coaxial radio frequency connector head. With the development of communication technology, the application of radio frequency passive devices is becoming more and more widespread, and the high-frequency performance of the radio frequency hair button as an inter-board connector contact is the most important performance index of the product. When testing the high-frequency performance, two pieces of adapter test boards are usually needed to be made and the SMA connector heads are respectively led out to connect the vector network analyzer for testing, in addition, a calibration test board is needed to be made and calibrated, and the test data is calibrated by an algorithm to obtain the high-frequency transmission characteristics of the hair button itself. Such method needs to make three test boards in total, which is relatively cumbersome in actual production and testing, and the design and production cost is high. Meanwhile, in the actual use process, whether in the TRL and AFR calibration test, or the transmission of signals between the antenna and the PCB, the inter-board radio frequency connector needs to be connected with the PCB, and in order to improve the bandwidth and performance of the transmission signal, the impedance consistency with the SMA connector head should be ensured as much as possible. However, since the radio frequency connector is converted into PCB wiring, it is a conversion from coaxial structure to non-coaxial structure, so that the impedance discontinuity point will be generated, and how to realize the smooth impedance transition to optimize the high-frequency performance of the SMA package becomes an important research topic. SUMMARY

[0003] To solve the above problems, the present application provides a self-calibration type radio frequency hair button high-frequency performance test tool and test method, which has the advantages of simple tool structure, reduced high-frequency energy leakage and convenient testing.

[0004] To achieve the above object, the technical scheme adopted by the present application is as follows:

[0005] The utility model provides a kind of self-correcting type radio frequency button high-frequency performance test tool, including a PCB board, button connector, first coaxial radio frequency connector head and second coaxial radio frequency connector head, the PCB board main body includes top layer, several intermediate layers and bottom layer, it includes first signal trace, two signal vias, two groups of ground via groups and four positioning holes on the PCB board, the signal via is from top layer and penetrates to bottom layer, signal via is used to connect the inner plug of first coaxial radio frequency connector head and the inner plug of second coaxial radio frequency connector head, the ground via group is arranged in C type, and the opening of two groups of ground via groups is opposite, each group of ground via group includes at least 7 ground vias, the ground via is from top layer and penetrates to bottom layer and is electrically connected with reference ground in PCB board, the signal via is located at the center of ground via group, the two ends of first signal trace are electrically connected with two signal vias respectively, and first signal trace part is located in the middle of ground via group opening, first coaxial radio frequency connector head, button connector, second coaxial radio frequency connector head have positioning hole matched with test PCB board respectively, second coaxial radio frequency connector head is fixed on PCB board, button connector is detachably mounted between first coaxial radio frequency connector head and PCB board, the button connector includes shell and insulator, the insulator is fixed in the middle of shell, and the insulator has circular opening for placing button contact body in the center.

[0006] As preferred, the first coaxial radio frequency connector head, second coaxial radio frequency connector head and shell are fixedly connected with the PCB board by screws.

[0007] As preferred, each group of ground via groups includes 7 ground vias.

[0008] As preferred, the first signal trace is arranged in a straight line.

[0009] As preferred, the vertical distance D1 between the outer edge of the first signal trace and the center of the adjacent ground via is less than 1.5 mm, and the distance D2 between the centers of two adjacent ground vias is less than 1.5 mm.

[0010] As preferred, the radius D3 of the signal via matches the radius of the inner plug of the first coaxial radio frequency connector head and the second coaxial radio frequency connector head.

[0011] As preferred, the radius D3 of the signal via is 0.2 mm.

[0012] As preferred, the distance D5 between the center of the ground via and the center of the signal via is between D3 and D3. D3 D3 D3 D3, wherein is the relative dielectric constant of the PCB board, e is a natural constant.

[0013] A radio frequency pin self-insertion loss testing method, using the self-calibration type radio frequency pin high-frequency performance testing tool described above, comprises the following steps:

[0014] A. Remove the pin connector on the PCB board, install the to-be-tested pin contact on the pin connector, and then fix the pin connector between the first coaxial radio frequency connector head and the PCB board;

[0015] B. Connect the first coaxial radio frequency connector head, the second coaxial radio frequency connector head, and the network analyzer, and measure the absolute value Sa12 of the test insertion loss result of the to-be-tested pin contact through the network analyzer;

[0016] C. Take out the pin connector, and directly fix the first coaxial radio frequency connector head to the PCB board;

[0017] D. Connect the first coaxial radio frequency connector head, the second coaxial radio frequency connector head, and the network analyzer, and measure the absolute value Sb12 of the test insertion loss result through the network analyzer;

[0018] E. Calculate the insertion loss value SDUT12 of the to-be-tested pin contact, i.e. SDUT12 = Sa12 - Sb12;

[0019] F. Test completion.

[0020] The beneficial effects of using the present application are: the present application tests the insertion loss of the to-be-tested pin contact by using a single PCB board, two coaxial radio frequency connector heads, and a pin connector, avoiding the need for separate test calibration pieces and the cumbersome need for two test PCBs to be connected in the prior art, reducing the cost of the test tool; the present application ensures that the edge distance between the ground holes is less than 1 / 4 wavelength, i.e. 1.5 mm, reducing the leakage of radio frequency signals during transmission, while ensuring the distance from the ground via hole diameter to the center of the signal via hole, ensuring the signal via hole radius, so that the radio frequency connector on the PCB board can meet the impedance requirements, thereby ensuring the consistency of the impedance, optimizing the interface through this combination, making the characteristic impedance smoothly transition, and forming better signal shielding characteristics, which can reduce the leakage of high-frequency energy, thereby significantly improving the bandwidth and transmission performance of the coaxial radio frequency connector head. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural diagram of the self-calibration type radio frequency pin high-frequency performance testing tool in the present application;

[0022] Figure 2A top view of a self-calibration radio frequency button high-frequency performance test tool in the present application;

[0023] Figure 3 A structure schematic diagram of a PCB in the present application;

[0024] Figure 4 A top view of a button connector in the present application; Figure 3

[0025] Figure 5 A top view of a button connector in the present application;

[0026] Figure 6 A structure schematic diagram of a test tool when step C of a radio frequency button self-insertion loss test method in the present application is performed;

[0027] Reference signs include:

[0028] 100-PCB, 110-first signal trace, 120-signal via, 130-ground via, 200-button connector, 210-housing, 220-insulator, 221-circular opening, 300-first coaxial radio frequency connector head, 400-second coaxial radio frequency connector head. DETAILED DESCRIPTION

[0029] The present application is described in detail below with reference to the accompanying drawings.

[0030] As Figures 1-6 ​As shown, a self-correcting type radio frequency button high-frequency performance test tool includes a PCB board 100, a button connector 200, a first coaxial radio frequency connector head 300 and a second coaxial radio frequency connector head 400. The main body of the PCB board 100 includes a top layer, a plurality of intermediate layers and a bottom layer. The PCB board 100 includes a first signal trace 110, two signal vias 120, two groups of ground vias and four positioning holes. The signal vias 120 penetrate from the top layer to the bottom layer and are used to connect the inner cores of the first coaxial radio frequency connector head 300 and the second coaxial radio frequency connector head 400. The ground vias 130 are arranged in a C shape and their surfaces are in contact with the shells of the first coaxial radio frequency connector head 300 and the second coaxial radio frequency connector head 400 to form electrical connections. The openings of the two groups of ground vias are opposite to each other and are used to reserve space for the wiring of the first signal trace 110 to avoid electrical connection between the ground vias 130 and the first signal trace 110. Each group of ground vias includes at least seven ground vias 130. The ground vias 130 penetrate from the top layer to the bottom layer and are electrically connected to the reference ground in the PCB board 100, i.e., to the positioning holes in the PCB board 100. The positioning holes in the PCB board 100 serve as positioning and reference ground. The signal vias 120 are located at the center of the ground via group. The two ends of the first signal trace 110 are electrically connected to the two signal vias 120. Part of the first signal trace 110 is located in the middle of the opening of the ground via group. The first coaxial radio frequency connector head 300, the button connector 200 and the second coaxial radio frequency connector head 400 have positioning holes matched with the test PCB board 100. The second coaxial radio frequency connector head 400 is fixed on the PCB board 100. The button connector 200 is detachably mounted between the first coaxial radio frequency connector head 300 and the PCB board 100. The button connector 200 includes a shell 210 and an insulator 220. The insulator 220 is fixed in the middle of the shell 210 and has a circular opening 221 in the center for placing a button contact.

[0031] The first coaxial radio frequency connector head 300, the second coaxial radio frequency connector head 400 and the shell 210 are fixedly connected to the PCB board 100 by screws. The first coaxial radio frequency connector head 300, the second coaxial radio frequency connector head 400, the shell 210 and the PCB board 100 have matching positioning holes. The screws are matched with the positioning holes to fixedly connect the first coaxial radio frequency connector head 300, the shell 210, the second coaxial radio frequency connector head 400 and the PCB board 100.

[0032] Each group of ground vias includes seven ground vias 130.

[0033] The first signal trace 110 is arranged in a straight line. This arrangement is conducive to signal transmission.

[0034] The vertical distance D1 between the outer edge of the first signal trace 110 and the center of the adjacent via 130 is less than or equal to 1 / 4 of the minimum wavelength of the signal transmitted in the first signal trace 110, and the distance D2 between the centers of two adjacent ground vias 130 is less than or equal to 1 / 4 of the minimum wavelength of the signal transmitted in the first signal trace 110. For example, for a 50GHz signal, the wavelength is 6mm, and the distance is less than 1.5mm.

[0035] The radius D3 of the signal via 120 matches the radius of the inner core of the first coaxial RF connector head 300 and the inner core of the second coaxial RF connector head 400.

[0036] The radius D3 of the signal via 120 is 0.2mm.

[0037] The distance D5 between the center of the ground via and the center of the signal via is between D3 and D3, and the minimum distance D4 between the edge of the ground via and the center of the signal via is between D3 and D3, where is the relative dielectric constant of the PCB board, and e is the natural constant. The characteristic impedance of the packaging structure of the first coaxial RF connector head 300, the second coaxial RF connector head 400 and the PCB board 100 approximately satisfies the formula Z 0= where Z0 is the impedance characteristic of the first coaxial RF connector head 300 and the second coaxial RF connector head 400, which is 50Ω. According to the 10% fluctuation allowed by the SMA interface and general PCB trace, it can be deduced that D4 and D5 respectively satisfy approximately D3, and according to the 10% fluctuation allowed by the SMA interface and general PCB trace, it can be deduced that D5 is between D3 and D3, and D4 is between D3 and D3.

[0038] A test method for the self-insertion loss of a radio frequency button, using the above-mentioned self-calibration type radio frequency button high frequency performance test tool, comprising the following steps:

[0039] A. Remove the button connector 200 from the PCB board 100, install the button contact to be tested on the button connector 200, and then fix the button connector 200 between the first coaxial RF connector head 300 and the PCB board 100;

[0040] B. Connect the first coaxial RF connector head 300, the second coaxial RF connector head 400 with the network analyzer, and measure the absolute value of the test insertion loss result of the to-be-tested female button contact body through the network analyzer Sa12;

[0041] C. Take out the female button connector 200, and directly fix the first coaxial RF connector head 300 to the PCB board 100;

[0042] D. Connect the first coaxial RF connector head 300, the second coaxial RF connector head 400 with the network analyzer, and measure the absolute value of the test insertion loss result through the network analyzer Sb12;

[0043] E. Calculate the insertion loss value of the to-be-tested female button contact body SDUT12, that is, SDUT12= Sa12- Sb12;

[0044] F. The test is completed.

[0045] The test method using the above self-calibration type RF female button high-frequency performance test tool is fast and accurate.

[0046] The above is only the preferred embodiment of the present application, and for those skilled in the art, many changes can be made to the specific implementation and application range according to the idea of the present application, as long as these changes do not deviate from the concept of the present application, and all belong to the protection scope of the present application.

Claims

1. A self-calibrating RF button high-frequency performance testing fixture, characterized in that: The application relates to a PCB board (100), a pin connector (200), a first coaxial radio frequency connector head (300) and a second coaxial radio frequency connector head (400), the PCB board (100) comprises a top layer, a plurality of middle layers and a bottom layer, the PCB board (100) comprises a first signal wire (110), two signal vias (120), two groups of ground vias and four positioning holes, the signal vias (120) penetrate through the top layer to the bottom layer, the signal vias (120) are used for connecting the inner insertion cores of the first coaxial radio frequency connector head (300) and the second coaxial radio frequency connector head (400), the ground vias are arranged in a C shape, the openings of the two groups of ground vias are opposite to each other, each group of the ground vias comprises seven ground vias (130), the ground vias (130) penetrate through the top layer to the bottom layer and are electrically connected with the reference ground in the PCB board (100), the signal vias (120) are located at the center of the ground via group, the two ends of the first signal wire (110) are electrically connected with the two signal vias (120) respectively, the first signal wire (110) is partially located in the middle part of the opening of the ground via group, the first coaxial radio frequency connector head (300), the pin connector (200) and the second coaxial radio frequency connector head (400) have the positioning holes matched with the test PCB board (100) respectively, the second coaxial radio frequency connector head (400) is fixed on the PCB board (100), the pin connector (200) is detachably arranged between the first coaxial radio frequency connector head (300) and the PCB board (100), the pin connector (200) comprises a shell (210) and an insulator (220), the insulator (220) is fixed in the middle part of the shell (210), the insulator (220) is provided with a circular opening (221) in the center for placing a pin contact body. The vertical distance D1 between the outer edge of the first signal wire (110) and the center of the adjacent ground via (130) is less than or equal to 1 / 4 of the minimum wavelength of the signal transmitted in the first signal wire (110), and the distance D2 between the centers of the two adjacent ground vias (130) is less than or equal to 1 / 4 of the minimum wavelength of the signal transmitted in the first signal wire (110). The radius D3 of the signal via (120) is matched with the radius of the inner insertion core of the first coaxial radio frequency connector head (300) and the second coaxial radio frequency connector head (400), and the radius D3 of the signal via (120) is 0.2 mm. The distance D5 between the center of the ground via (130) and the center of the signal via (120) is between D3 and D3+D1 The minimum distance D4 between the edge of the ground via (130) and the center of the signal via (120) is between D3 and D3+D1 D3 and D3+D1, wherein is the relative dielectric constant of the PCB board (100), and e is the natural constant. During detection, the pin contact body to be detected is arranged on the pin connector (200), and then the pin connector (200) is fixed between the first coaxial radio frequency connector head (300) and the PCB board (100).

2. The self-calibrating radio frequency button high frequency performance test tool of claim 1, wherein: The first coaxial radio frequency connector head (300), the second coaxial radio frequency connector head (400) and the shell (210) are fixedly connected with the PCB board (100) through screws.

3. The self-calibrating radio frequency button high frequency performance test tool of claim 1, wherein: Each group of the ground vias comprises seven ground vias (130).

4. The self-calibrating radio frequency button high frequency performance test tool of claim 1, wherein: The first signal wire (110) is arranged in a straight line.

5. The self-calibrating radio frequency button high frequency performance test tool of claim 1, wherein: The vertical distance D1 between the outer edge of the first signal trace (110) and the center of the adjacent via (130) is less than 1.5 mm, and the distance D2 between the centers of the two adjacent vias (130) is less than 1.5 mm.

6. A method for testing the self-insertion loss of a radio frequency button, using the self-calibrating radio frequency button high frequency performance test tool of claim 1, characterized in that: The method comprises the following steps: A. Remove the pin header connector (200) from the PCB (100), install the test pin contact on the pin header connector (200), and then fix the pin header connector (200) between the first coaxial RF connector head (300) and the PCB (100); B. Connect the first coaxial RF connector head (300), the second coaxial RF connector head (400) and the network analyzer, and measure the absolute value Sa12 of the test insertion loss result of the test pin contact through the network analyzer; C. Remove the pin header connector (200) and directly fix the first coaxial RF connector head (300) to the PCB (100); D. Connect the first coaxial RF connector head (300), the second coaxial RF connector head (400) and the network analyzer, and measure the absolute value Sb12 of the test insertion loss result through the network analyzer; E. Calculate the insertion loss value SDUT12 of the test pin contact, i.e. SDUT12 = Sa12 - Sb12; F. Test is completed.

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