CN213581203U - Circulator test fixture - Google Patents

Abstract

The utility model discloses a circulator test fixture, including circuit board and conducting block, the circuit board is installed on the conducting block, be equipped with transmission line and pad on the circuit board, be equipped with ground connection region and detection zone on the circuit board, the transmission line is located in the circuit board, ground connection region and detection zone all with transmission line electric connection, the pad is connected in the detection zone through first elastomeric element to make the pad be less than the ground connection region when receiving the roof pressure; the first elastic part is used for providing a first elastic stress to drive the bonding pad to be higher than the grounding area; the detection area is equipped with the thimble, the thimble is located the below of pad and can moves along the direction of height of circuit board. The utility model discloses a circulator test fixture, its electric connection that can improve test fixture and the circulator that awaits measuring guarantees the reliability and the repeatability of test result.

Description

Circulator test fixture

Technical Field

The utility model relates to a circulator equipment technical field especially relates to a circulator test fixture.

Background

Circulators are passive devices that are widely used in high frequency (rf/microwave) applications. For example: the circulator can enable radio frequency signals to be transmitted among the transmitter, the antenna and the receiver according to a specified path. If a signal is transmitted from the transmitter to the antenna, the receiver needs to be isolated, whereas if the antenna receives a signal, the transmitter needs to be isolated. A circulator typically has 3 ports, and if one of the ports is loaded, it is effectively an isolator. Therefore, the isolator and the circulator are collectively referred to herein as a circulator. There are many different types of circulators available, such as waveguide circulators, microstrip line circulators and stripline circulators. During manufacture, each circulator needs to be electromagnetically tuned and tested to ensure compliance with specification requirements. Stripline circulators can generally be divided into two main types, embedded circulators or surface mounted circulators. Testing can be performed by screwing the circulator directly onto the test fixture, or by securing the circulator in place by a mechanical clamping mechanism.

The most convenient way to test surface mount circulators is to use a microstrip test fixture. The microstrip test fixture comprises a conductive metal block, a microstrip circuit board and a coaxial connector. The top surface of the printed circuit board has a 50 ohm microstrip transmission line for connecting each ring port, and a ground. The bottom of the printed circuit board is a ground layer. The printed circuit board is typically soldered or screwed to a conductive metal block and then the coaxial connector is also screwed to the metal block. The center conductor of the coaxial connector will be soldered to the transmission line of the printed circuit board. The other end of the transmission line is connected to the pad. The port pin of the circulator will contact this pad location under test conditions. During testing, the circulator is placed on the printed circuit board, the bottom of the circulator shell is contacted with the grounding part of the printed circuit board, and the pin of the circulator port is contacted with the transmission line pad. This is problematic because the ground and transmission lines are in the same plane on the printed circuit board, but because circulators are mechanical devices, the bottom of the housing and the port pins are not always in the same plane, but there is a difference in coplanarity, and even if this difference is small, there are many times when the port pins are slightly higher or lower than the bottom of the housing. This may lead to testing problems, such as one or more ports of the circulator not contacting the microstrip circuit board.

The above background disclosure is only for the purpose of assisting understanding of the inventive concepts and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above contents are disclosed at the filing date of the present patent application.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a circulator test fixture, it can improve the test fixture and the electric connection of the circulator that awaits measuring, guarantees the reliability and the repeatability of test result.

The purpose of the utility model is realized by adopting the following technical scheme:

a circulator test fixture comprises a circuit board and a conductive block, wherein the circuit board is mounted on the conductive block, the circuit board is provided with a transmission line and a bonding pad, the circuit board is provided with a grounding area and a detection area, the transmission line is arranged in the circuit board, the grounding area and the detection area are both electrically connected with the transmission line, and the bonding pad is connected to the detection area through a first elastic component so as to enable the bonding pad to have a movement trend along the height direction of the circuit board; the detection area is equipped with the thimble, the thimble is located the below of pad and can moves along the direction of height of circuit board.

Preferably, the detection area is provided with a notch, a thimble penetrates into the notch, and the thimble is used for being received in the notch after moving downwards; the ejector pin is used for extending out of the notch after moving upwards.

Preferably, the bottom end of the thimble is connected to the conductive block through a second elastic component, and the second elastic component is used for providing a second elastic stress to drive the thimble to move upwards; the elastic coefficient of the second elastic member is larger than that of the first elastic member.

Preferably, the conductive block is provided with a mounting hole, and the mounting hole is arranged corresponding to the notch; the bottom ends of the second elastic part and the ejector pin are mounted in the mounting hole.

Preferably, the first elastic component and the second elastic component are springs or elastic sheets or elastic glue.

Preferably, the circulator test fixture further comprises a coaxial connector, and the coaxial connector is arranged on the side part of the conductive block; the inner conductor of the coaxial connector is electrically connected with the transmission line; and the ground wire of the coaxial connector is electrically connected with the conductive block.

Preferably, the bonding pad and the thimble are provided with at least two.

Compared with the prior art, the beneficial effects of the utility model reside in that: the pad is connected with the detection area of the circuit board through the first elastic component and is matched with the thimble structure of the detection area, so that the pad has three states of being higher than, parallel and lower than the grounding area during detection, the contact effect of the pad and the pins of the tested circulator and the contact effect of the shell of the tested circulator and the grounding part of the circuit board are automatically adjusted, the reliable electrical connection between the tested circulator and a test fixture is ensured, the accuracy, stability and repeatability of a test result are ensured, and the debugging and testing efficiency of the surface-mounted strip line circulator can be improved.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic view of the exploded structure of the present invention.

In the figure: 10. a conductive block; 11. mounting holes; 20. a circuit board; 21. a pad; 22. a first elastic member; 23. a thimble; 24. a recess; 30. a coaxial connector.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments:

as shown in fig. 1 and 2, the testing jig for a circulator comprises a circuit board 20 and a conductive block 10, wherein the circuit board 20 is mounted on the conductive block 10, and a transmission line and a pad 21 are disposed on the circuit board 20. The specific circuit board 20 is provided with a grounding area and a detection area, the transmission line is arranged in the circuit board 20, and the grounding area and the detection area are electrically connected with the transmission line.

The land 21 is connected to the inspection area by the first elastic member 22, and since the land 21 is connected to the circuit board 20 by the first elastic member 22, the land 21 has a tendency to move in the height direction of the circuit board 20. In addition, an ejector pin 23 is provided at the detection area, and the ejector pin 23 is located below the land 21 and is movable in the height direction of the circuit board 20.

On the basis of the structure, when the circulator test fixture of the utility model is used,

during testing, the bottom of the casing of the device under test (not shown) needs to contact the grounding area of the circuit board 20, the pins of the device under test need to contact the pads 21 of the circuit board 20, when the pins of the device under test are higher than the bottom of the casing, the lower bottom of the casing of the device under test is in good contact with the grounding area of the circuit board 20, at this time, the pins 23 can move upwards, the pins 23 can jack up the pads 21, and the pads 21 are also in good contact with the higher pins of the device under test.

If the bottom of the casing of the device under test is level with the pins of the device under test, the bottom of the casing of the device under test can contact the ground portion of the circuit board 20 when the pads 21 are pressed down to be level with the ground regions of the circuit board 20 by applying a downward force to the device under test from the top of the device under test.

When the pins of the device under test are lower than the bottom of the casing, the pins of the device under test will press on the pads 21, and the casing of the device under test is higher than the grounding portion of the circuit board 20, but when a downward force is applied to the device under test from the top of the device under test, the pins of the device under test will press down the pads 21 while the ejector pins 23 are moved downward until the pins of the device under test are lower than the grounding area of the circuit board 20, and finally the casing of the device under test will make good contact with the grounding portion of the circuit board 20.

In summary, since the pad 21 is connected to the detection area of the circuit board 20 through the first elastic component 22, and the structure of the thimble 23 in the detection area is matched, the pad 21 has three states of being higher than, flush with and lower than the ground area during detection, so as to achieve the contact effect of automatically adjusting the pad 21 and the pin of the tested circulator, and the contact effect of the tested circulator shell and the ground part of the circuit board 20, ensure the reliable electrical connection between the tested circulator and the test fixture, ensure the accuracy, stability and repeatability of the test result, and improve the debugging and testing efficiency of the surface-mounted strip line circulator.

Further, in this embodiment, a recess 24 may be provided at the detection region, and a bottom wall of the recess 24 is provided with a recess 24, the thimble 23 is inserted into the recess 24, and the thimble 23 is configured to be received in the recess 24 after moving downward; the ejector pin 23 is adapted to protrude out of the recess 24 after the upward movement. That is, when the leads are lower than the bottom of the housing, the pins 23 can move upward, and the pins 23 lift the pad 21 upward through the notches 24, so as to facilitate the electrical connection between the pad 21 and the leads. When the pin is higher than the bottom of the housing, the pin 23 can move downwards, the pin 23 can be received in the recess 24, the pad 21 can be received downwards in the recess 24 to match the height of the pin, and similarly, the pad 21 can be flush with the ground region on the top surface of the recess 24, that is, the recess 24 can provide a space for the pad 21 to move up and down.

Furthermore, the bottom end of the thimble 23 may be connected to the conductive block 10 through a second elastic member, and the second elastic member provides a second elastic stress to drive the thimble 23 to move upward. The elastic coefficient of the second elastic member is greater than that of the first elastic member 22, so that the first elastic member 22 can deform with a small force, the second elastic member can deform with a relatively large force, and the second elastic stress provided by the second elastic member can deform the bonding pad 21, so that the bonding pad 21 can be supported upwards and the bonding pad 21 can be ejected. And both the pad 21 and the second elastic member can be pressed downward at the time of pressing down.

Further, be equipped with mounting hole 11 on above-mentioned conducting block 10, can make mounting hole 11 correspond the setting with notch 24, the bottom of above-mentioned second elastomeric element and thimble 23 is all installed in mounting hole 11, and so mounting hole 11 can guide the stable deformation of second elastomeric element, and thimble 23 also can be in mounting hole 11 internal stability from top to bottom, and whole process can not appear the skew, and the testing process is more stable.

Of course, in this embodiment, the first elastic member 22 and the second elastic member can be implemented by using a spring, a leaf spring, or elastic glue.

Preferably, the circulator test fixture further includes a coaxial connector 30, the coaxial connector 30 being provided at a side portion of the conductive block 10; the inner conductor of the coaxial connector 30 is electrically connected to the transmission line; the ground wire of the coaxial connector 30 is electrically connected to the conductive block 10, and specifically, the coaxial connector 30 may be connected to the conductive block 10 by welding or fixed by screws. In this manner, the coaxial connector 30 may connect the circulator test fixture to external equipment.

Preferably, the number of the pads 21 and the number of the ejector pins 23 are at least two, so that the detection of at least two groups of pins can be performed, and the detection efficiency is higher.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.

Claims (7)

1. A circulator test fixture comprises a circuit board and a conductive block, wherein the circuit board is mounted on the conductive block, the circuit board is provided with a transmission line and a bonding pad, the circuit board is provided with a grounding area and a detection area, the transmission line is arranged in the circuit board, and the grounding area and the detection area are both electrically connected with the transmission line; the detection area is equipped with the thimble, the thimble is located the below of pad and can moves along the direction of height of circuit board.

2. The circulator test fixture of claim 1 wherein said detection region defines a recess, a pin passing within said recess, said pin for receipt within said recess upon downward movement; the ejector pin is used for extending out of the notch after moving upwards.

3. The circulator test fixture of claim 2 wherein the bottom end of said thimble is connected to said conductive block by a second resilient member, said second resilient member for providing a second resilient stress to urge said thimble upward; the elastic coefficient of the second elastic member is larger than that of the first elastic member.

4. The circulator test fixture of claim 3 wherein said conductive block has a mounting hole therein, said mounting hole being disposed in correspondence with said recess; the bottom ends of the second elastic part and the ejector pin are mounted in the mounting hole.

5. The circulator test fixture of any one of claims 1-4 wherein the first and second resilient members are springs or clips or elastomeric gel.

6. The circulator test fixture of any one of claims 1 to 4 further comprising a coaxial connector provided at a side portion of the conductive block; the inner conductor of the coaxial connector is electrically connected with the transmission line; and the ground wire of the coaxial connector is electrically connected with the conductive block.

7. The circulator test fixture of any one of claims 1-4 wherein at least two of the pads and the ejector pins are provided.

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