CN109596864B

CN109596864B - Test fixture

Info

Publication number: CN109596864B
Application number: CN201811552954.8A
Authority: CN
Inventors: 赵鑫
Original assignee: Shanghai Chuanggong Telecom Technology Co Ltd
Current assignee: Shanghai Chuanggong Telecom Technology Co Ltd
Priority date: 2018-12-19
Filing date: 2018-12-19
Publication date: 2021-07-30
Anticipated expiration: 2038-12-19
Also published as: CN109596864A

Abstract

The invention relates to the field of radio frequency antenna production, and provides a test fixture, which comprises: the test circuit board is used for bearing the support; the test circuit board is provided with a metal feed area which is electrically connected with the test device; the test fixture further comprises: the electrical connection assembly is arranged on the metal feed area and is used for being electrically connected with the antenna to be tested; the test fixture further comprises: and the coupling piece is electrically connected with the metal feeding area and is used for coupling with the antenna to be tested. When the consistency of the RF performance of the antenna is tested, the shell with the antenna to be tested is fixed on the support, the support is placed on the test circuit board, the metal feed area is electrically connected with the antenna to be tested in the support, information of the antenna is transmitted to the test device, the coupling piece can be coupled with the antenna to be tested, and therefore when the mobile phone is used, metal devices such as a USB (universal serial bus) and a motor of the mobile phone are coupled with the antenna, and the detection accuracy is improved.

Description

Test fixture

Technical Field

The invention relates to the field of radio frequency antenna production, in particular to a test fixture.

Background

With the rise of MDA antennas in recent years, the problem of consistency test management and control of MDA antennas becomes a common pain point in the industry. The MDA antenna is an in-mold injection molding process, so that the production control precision is much worse than that of a nanometer injection molding process, and large tolerance offset is easier to appear. The length of the antenna is strongly related to the size of the metal frame which is injected and molded in the mold, and in the mobile phone, metal devices such as USB, SPEAKER, and a motor which are close to the antenna can generate a coupling effect with the antenna to influence the resonant frequency, so that return loss is influenced. When the MDA antenna produced in batch by a production line is subjected to the RF performance consistency test, the MDA antenna can only be coupled with the antenna through the metal frame, and the actual coupling effect of metal devices such as USB, SPEAKER and motors of the mobile phone and the antenna cannot be simulated, so that the test result is inaccurate, defective products easily flow into an assembly link, and great waste and loss are caused.

Disclosure of Invention

The invention aims to provide a test fixture, which is used for testing the accuracy of an antenna after an antenna production process and preventing defective products of the antenna from flowing into an assembly link.

In order to solve the above technical problems, an embodiment of the present invention provides a test fixture, including: the device comprises a bracket for fixing a shell with an antenna to be tested and a test circuit board for bearing the bracket; the test circuit board is provided with a metal feed area which is electrically connected with the test device; the test fixture further comprises: the electrical connection assembly is arranged on the metal feed area and is used for being electrically connected with the antenna to be tested; the test fixture further comprises: and the coupling piece is electrically connected with the metal feeding area and is used for coupling with the antenna to be tested.

Compared with the prior art, when the consistency of the RF performance of the antenna is tested, the shell with the antenna to be tested is fixed on the support, the support is placed on the test circuit board, the metal feed area is electrically connected with the antenna to be tested in the support, the information of the antenna is transmitted to the test device, the coupling piece can be coupled with the antenna to be tested, and the coupling piece is used for simulating the coupling of metal devices such as USB, SPEAKER and a motor of the mobile phone and the antenna when the mobile phone is used, so that the detection accuracy is improved.

In addition, the stent includes: the antenna to be tested is clamped between the upper frame body and the lower frame body; the coupling piece is arranged on one side, facing the circuit board, of the lower frame body; alternatively, the coupling is disposed on the metal feed region.

In addition, the connection assembly includes: the lower frame body is provided with a plurality of through holes, the number of the through holes is the same as that of the metal connecting pieces, the positions of the through holes correspond to those of the metal connecting pieces one by one, and each connecting piece is used for penetrating through the corresponding through hole and entering the shell to be electrically abutted against the antenna to be tested. The metal connecting piece penetrates through the through hole to be connected with the antenna to be detected, the connecting position is accurate, and the through hole protects the metal connecting piece from being damaged.

In addition, each metal connecting piece is an elastic metal connecting needle. When the through hole is not aligned with the elastic metal connecting needle, the elastic metal connecting needle is compressed and cannot be damaged.

In addition, the metal feed region includes: conductive part and a plurality of headroom portion, the quantity of headroom portion with the quantity of headroom district in the casing is the same and the one-to-one, and each the headroom portion all blocks separately corresponding the headroom district completely.

In addition, at least one metal connecting piece is arranged in each empty part, and the metal connecting pieces in each empty part are electrically connected with the conductive parts through feed lines.

In addition, the conductive part is a copper foil arranged on the test circuit board.

In addition, the lower frame body is arranged in a rectangular shape, the lower frame body is provided with two opposite long sides and two opposite wide sides, and the coupling piece is close to any one of the wide sides. The coupling piece is used for simulating metal devices such as USB, SPEAKER and a motor close to the antenna, and therefore the coupling piece is arranged on the wide side of the mobile phone.

Additionally, the coupling includes: establish in insulator frame body on the lower support body, establish coupling antenna on the insulator frame body.

In addition, the insulation frame body and the lower frame body are integrally formed. The production is convenient and fast, and the raw material cost of the production is not increased.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

FIG. 1 is a schematic structural diagram of a test fixture according to a first embodiment;

FIG. 2 is a test chart of the test fixture according to the first embodiment;

FIG. 3 is a schematic structural view of a test circuit board in the first embodiment;

fig. 4 is a schematic structural view of a lower frame body in the first embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.

The first embodiment of the invention relates to a test fixture, which is used for transmitting information for detecting an MDA antenna to a test device.

As shown in fig. 1 and 4, a first embodiment of the present invention relates to a test fixture for transmitting information of an MDA antenna to a test apparatus.

The test fixture comprises: the testing device comprises a support 1, a testing circuit board 3 for bearing the support 1, an electrical connection assembly and a coupling piece 4, wherein the electrical connection assembly and the coupling piece 4 are arranged on the testing circuit board 3, the support 1 is used for fixing a shell 2 with an antenna 21 to be tested, a metal feeding area 31 is arranged on the testing circuit board 3, the metal feeding area 31 is connected with a testing device, the metal feeding area 31 is used for transmitting information of the antenna 21 to be tested to the testing device, the coupling piece 4 is used for being coupled with the antenna 21 to be tested, the coupling effect of a metal frame of the mobile phone and the antenna 21 to be tested is simulated, the consistency of the antenna 21 to be tested is judged by the testing device, the coupling piece 4 simulates the coupling of metal devices such as USB, SPEAKER and a motor in the mobile phone and the antenna 21 to be tested, the testing accuracy is improved, and the problem that the poor performance of the antenna is found only when the mobile phone is installed is avoided, and the loss is larger.

As shown in fig. 2 and 4, the test circuit board 3 is connected to the antenna 21 to be tested in the bracket 1 through an electrical connector, in this embodiment, the electrical connector is an elastic metal connecting pin 5, and certainly, the electrical connector may also be other connectors, and in this embodiment, only the elastic metal connecting pin 5 is taken as an example, and is not limited specifically. The stent 1 comprises: the antenna 21 and the casing 2 to be tested are clamped between the upper frame body 11 and the lower frame body 12, wherein the lower frame body 12 is provided with a plurality of through holes 121, the number of the through holes 121 is the same as that of the elastic metal connecting needles 5, the through holes 121 correspond to one another, and the elastic metal connecting needles 5 penetrate through the through holes 121 of the lower frame body 12 and are connected with the antenna 21 to be tested in the support 1.

During testing, the housing 2 with the antenna 21 to be tested is firstly placed between the upper frame body 11 and the lower frame body 12, each through hole 121 of the lower frame body 12 is aligned with each elastic metal connecting needle 5, and the metal feeding area 31 is connected with the antenna 21 to be tested through each elastic metal connecting needle 5; if the through holes 121 are not completely aligned with the elastic metal connecting pins 5, the elastic metal connecting pins 5 are compressed and not damaged when the lower frame 12 is pressed down. After each elastic metal connecting pin 5 is connected with the antenna 21 to be tested, the information of the antenna 21 to be tested is transmitted to the testing device through the metal feeding area 31. The testing device compares the information of the antenna 21 to be tested with the preset parameters, judges whether the antenna 21 to be tested meets the standard or not, and screens out the defective products.

Wherein, as shown in fig. 3, the metal feeding region 31 includes: the conductive portion 311 and the clearance portions 312, in the present embodiment, the conductive portion 311 is a copper foil disposed on the test circuit board 3, and of course, the conductive portion 311 may be made of other conductive materials. The elastic metal connecting pin 5 is arranged on the conductive part 311, and the conductive part 311 is used for transmitting the information of the antenna 21 to be tested to the testing device; if the clearance areas are arranged in the housing 2, the clearance parts 312 of the metal feeding area 31 are the same in number as the clearance areas and are in one-to-one correspondence with the clearance areas, and the area of the clearance parts 312 is larger than that of the corresponding clearance areas, so that each clearance area is completely blocked by each clearance part 312, and the area of the clearance parts 312 is larger, so that a better radiation effect of the antenna can be obtained.

It should be noted that at least one elastic metal connection pin 5 is disposed in the clearance portion 312, a plurality of feeding lines 6 are disposed on the conductive portion 311, the number of the feeding lines 6 is the same as the number of the clearance portion 312 and corresponds to the number of the clearance portion 312 one by one, each feeding line 6 extends into the clearance portion 312, one end of each feeding line 6 located at the clearance portion 312 is disposed with an elastic metal connection pin 5, and the elastic metal connection pin 5 is used for penetrating through the corresponding through hole 121 to be connected with the antenna to be tested 21. The feed line 6 is used for simulating an antenna FPC (flexible printed circuit) by using a section of wiring on the test circuit board 3 to generate intermediate frequency resonance; the feed line 6 is arranged, so that the principle that the antenna resonance of the test fixture is generated is consistent with that of the mobile phone end, and the inaccuracy of management and control testing of a shell factory under the condition of no FPC antenna is avoided.

As shown in fig. 4, the coupling element 4 may be disposed on a side of the lower frame 12 facing the test circuit board 3, the lower frame 12 is rectangular and has two opposite long sides and two opposite wide sides, the coupling element 4 is disposed near any one of the wide sides, and the coupling element 4 includes an insulating frame body disposed on the lower frame 12 and a coupling antenna disposed on the insulating frame body. The coupling antenna can generate a coupling effect with the antenna 21 to be tested. The insulating frame body and the lower frame body 12 are integrally formed, in this embodiment, both the lower frame body 12 and the insulating frame body are made of acrylic, of course, the lower frame body 12 and the insulating frame body may also be made of other materials, and in this embodiment, only acrylic is taken as an example, and no specific limitation is made. The lower frame body 12 and the insulating frame body are integrally formed, so that the production is convenient and fast, and the raw material cost of the production is not increased. The lower frame body 12 is used for supporting the coupling antenna, and the insulating frame body is arranged on the upper side of the lower frame body 12, so that the coupling antenna and the antenna 21 to be detected are always in a preset distance, the change of the terminal sensitive size of the antenna 21 to be detected can be detected, and the influence of size deviation on the performance of the antenna is prevented.

It is worth noting that the test circuit board 3 is provided with a grounding connection pin which is used for connecting the ground wire of the shell 2, so that the bottom wire of the shell 2 is better connected with the test fixture, and the test stability is improved.

In the cell-phone, the resonance of antenna can all be influenced to 1 frame of rearmounted two camera metal support, earphone, leading camera back steel sheet, but through experimental debugging discovery, the conductive part 311 copper foil on the test circuit board 3 that only needs to remain the earphone projection below region can realize the management and control to the sensitive size of antenna, promotes and detects the precision.

The second embodiment of the present invention relates to a test fixture. The second embodiment is substantially the same as the first embodiment, and mainly differs therefrom in that: a coupling member 4 is provided on the test circuit board 3, the coupling member 4 including: an insulating frame body arranged on the test circuit board 3 and a coupling antenna arranged on the upper surface of the insulating frame body. When each elastic connecting pin passes through the through hole 121 of the lower frame body 12 to be connected with the antenna 21 to be detected, the distance between the coupling antenna and the antenna 21 to be detected is a preset distance, so that the change of the sensitive size of the tail end of the antenna 21 to be detected can be detected, and the influence of size deviation on the antenna performance is prevented.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims

1. A test fixture, comprising: the device comprises a bracket for fixing a shell with an antenna to be tested and a test circuit board for bearing the bracket; the test circuit board is provided with a metal feed area which is electrically connected with the test device;

the test fixture further comprises: the electrical connection assembly is arranged on the metal feed area and is used for being electrically connected with the antenna to be tested;

the test fixture further comprises: and the coupling piece is electrically connected with the metal feed area and is used for coupling with the antenna to be tested and simulating the coupling of a metal device in the mobile phone and the antenna to be tested.

2. The test fixture of claim 1, wherein the bracket comprises: the antenna to be tested is clamped between the upper frame body and the lower frame body;

the coupling piece is arranged on one side, facing the circuit board, of the lower frame body;

alternatively, the coupling is disposed on the metal feed region.

3. The test fixture of claim 2, wherein the connection assembly comprises: the lower frame body is provided with a plurality of through holes, the number of the through holes is the same as that of the metal connecting pieces, the positions of the through holes correspond to those of the metal connecting pieces one by one, and each connecting piece is used for penetrating through the corresponding through hole and entering the shell to be electrically abutted against the antenna to be tested.

4. The test fixture of claim 3, wherein each metal connector is an elastic metal connecting pin.

5. The test fixture of claim 3, wherein the metal feed area comprises: conductive part and a plurality of headroom portion, the quantity of headroom portion with the quantity of headroom district in the casing is the same and the one-to-one, and each the headroom portion all blocks separately corresponding the headroom district completely.

6. The test fixture of claim 5, wherein at least one metal connector is disposed in each of the clearance portions, and the metal connector in each of the clearance portions is electrically connected to the conductive portion through a feeding line.

7. The test tool of claim 5, wherein the conductive portion is a copper foil disposed on the test circuit board.

8. The test fixture of claim 2, wherein the lower frame body is rectangular in shape, the lower frame body having two opposing long sides and two opposing wide sides, the coupling member being disposed proximate to either of the wide sides.

9. The test tool of claim 2, wherein the coupling comprises: establish in insulator frame body on the lower support body, establish coupling antenna on the insulator frame body.

10. The test tool of claim 9 wherein the insulator block is integrally formed with the lower block.