Test fixture for surface mount surface acoustic wave filter
A surface acoustic wave and surface mount technology, which is applied in the direction of instruments, measuring devices, and measuring electrical variables, can solve the problems of inability to test the performance of high-frequency surface acoustic wave filters, poor performance of high-frequency surface acoustic wave filters, and contact area Limited and other problems, to achieve the effect of adjusting height, reducing transmission loss, and reducing contact loss
Active Publication Date: 2016-11-09
CHINA ELECTRONICS TECH GRP CORP CHONGQING ACOUSTIC OPTIC ELECTRONICS CO LTD
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Problems solved by technology
The surface mount filter, due to the ceramic shell, is connected to the ground only by the extremely small terminal on the ceramic shell, and the contact area is limited. Compared with the device with a full metal package shell, its grounding performance is poor. Performance of high frequency SAW filters in surface mount ceramic housings will be degraded
The performance of high-frequency surface acoustic wave filters cannot be well tested by using traditional test fixtures
Method used
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[0018] A surface mount surface acoustic wave filter test fixture such as figure 1 As shown, it includes a test base 1, a test circuit board 3 and a test bead 2. The test circuit board 3 is detachably installed in the middle of the upper surface of the test base 1 in the longitudinal direction, and the upper surface of the test circuit board 3 is covered with a conductive film 5 that enhances conductivity. The conductive film 5 is provided with a test board frame 4, and the middle part of the test board frame 4 is provided with a cavity that penetrates up and down, and the cavity is used to place the device under test to realize the lateral positioning of the device under test; on the test circuit board 3 The side is suspended with a high-frequency adapter 7, and the high-frequency adapter 7 is used to connect the input and output signals of the device under test; the two ends of the test bead 2 are set on the upper surface of the test base 1 through fastening screws 8 and are l...
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The invention discloses a test fixture for a surface mount surface acoustic wave filter. The test fixture comprises a test base, a test circuit board and a test pressing strip; the test circuit board is detachably installed on the middle of the upper surface of the test base in the length direction of the upper surface of the test base; a conductive film for enhancing electrical conductivity is laid on the upper surface of the test circuit board; a test board frame is arranged on the conductive film; a cavity which is communicated longitudinally is arranged at the middle part of the test board frame; high-frequency adapters are arranged on side surfaces of the test circuit board in a suspended manner; and the two ends of the test pressing strip are arranged on the upper surface of the test base through fastening screws and are located on the test circuit board. According to the test fixture for the surface mount surface acoustic wave filter of the invention, the size of the upper surface of the test base and the size of the test circuit board are decreased, the length of a signal line on the test circuit board is decreased, and transmission loss is decreased; the protruding portion of the test pressing strip is larger than a tested device, so that the device can better contact with the test circuit board, and therefore, contact loss can be decreased; and the two ends of the test pressing strip are fixed through the screws, and height can be adjusted flexibly. The test fixture can be widely applied to the testing of a surface mount shell devices in different encapsulations.
Description
technical field [0001] The invention belongs to the technical field of surface acoustic wave devices, in particular to a test fixture for surface mount surface acoustic wave filters. Background technique [0002] Surface acoustic wave filters have been widely used in communications, radar, navigation, mobile communications, etc. With the development of technology, higher frequency surface acoustic wave filters are required, but the higher the frequency, the greater the transmission loss, which is affected by the external The more serious the impact. The surface mount filter, because of the ceramic shell, is connected to the ground only by the extremely small terminal on the ceramic shell, and the contact area is limited. Compared with the device with the full metal package shell, its grounding performance is poor, so the package is in The performance of high frequency SAW filters in surface mount ceramic housings will be degraded. The performance of high-frequency surface ...
Claims
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Login to View More IPC IPC(8): G01R1/04
CPCG01R1/0425
Inventor 周卫杜波蒋欣唐平陈岗董姝
Owner CHINA ELECTRONICS TECH GRP CORP CHONGQING ACOUSTIC OPTIC ELECTRONICS CO LTD