CN-121995142-A - Device and method for testing temperature characteristics of surface-mounted filter

CN121995142ACN 121995142 ACN121995142 ACN 121995142ACN-121995142-A

Abstract

The invention provides a temperature characteristic testing device of a surface-mounted filter, which belongs to the technical field of electronic component testing and comprises an in-box testing unit and a main control and data acquisition system, wherein the in-box testing unit comprises a multi-station testing clamp system, a high-low temperature control system and an automatic switch switching system, the multi-station testing clamp system comprises a PCB circular plate, the automatic switch switching system comprises a signal input interface, a signal output interface, an upper radio frequency switch and a lower radio frequency switch, and the main control and data acquisition system is in communication connection with the high-low temperature control system. The integrated PCB test module, the multi-path radio frequency switch and the transmission line with consistent length reduce uncertainty and loss of a radio frequency path to the greatest extent, and ensure consistency and accuracy of test data. The invention also discloses a testing method of the surface mount filter temperature characteristic testing device.

Inventors

WU GANG
XIAO HONGWEI
XIANG SHANG
SHI XINRONG
Chen Die

Assignees

武汉海创电子股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260130

Claims (5)

1. The temperature characteristic testing device for the surface-mounted filter is characterized by comprising an in-box testing unit (A) and a main control and data acquisition system (B), wherein the in-box testing unit (A) comprises a multi-station testing clamp system (100), a high-low temperature control system (200) and an automatic switch switching system (300); The multi-station test fixture system (100) is positioned in the high-low temperature control system (200), and the multi-station test fixture system (100) comprises a PCB circular plate (110), wherein a plurality of uniformly-spaced test stations (120) are integrated on the upper layer of the PCB circular plate (110) along the circumference; The automatic switch switching system (300) comprises a signal input interface (310), a signal output interface (320), an upper-layer radio frequency switch (330) and a lower-layer radio frequency switch (340), wherein the signal input interface (310) and the signal output interface (320) are arranged on the side surface of a PCB circular plate (110), the upper-layer radio frequency switch (330) is arranged in the center of the upper layer of the PCB circular plate (110), an input end pin of each test station (120) is connected with the upper-layer radio frequency switch (330) through a high-frequency microstrip line (130), the lower-layer radio frequency switch (340) is arranged in the center of the lower layer of the PCB circular plate (110), an output end pin of each test station (120) is connected with the lower-layer radio frequency switch (340) through a high-frequency microstrip line (130), the signal input interface (310) is connected with a public port of the upper-layer radio frequency switch (330) through a high-frequency microstrip line (130), is connected with a main control and data acquisition system (B) through a high-frequency low-temperature system (200), and the output end pin of each test station (120) is connected with the high-frequency microstrip line (200) through the high-frequency temperature control system (200); the main control and data acquisition system (B) is in communication connection with the high-low temperature control system (200).
2. The surface mount filter temperature characteristic testing device according to claim 1, wherein a blind hole (111) is formed in the circular PCB (110), and the signal output interface (320) is connected with a public port of the lower-layer radio frequency switch (340) through the blind hole (111) by passing through the high-frequency microstrip line (130).
3. The surface mount filter temperature characteristic testing device according to claim 2, wherein the high-frequency microstrip line (130) is embedded in the PCB circular plate (110).
4. The surface mount filter temperature characteristic testing device according to claim 3, wherein the main control and data acquisition system (B) comprises a main control computer (400) and a vector network analyzer (500), wherein the main control computer (400) sends control instructions to the high-low temperature control system (200), sends control instructions to the automatic switch switching system (300) and sends control and data acquisition instructions to the vector network analyzer (500); the signal input interface (310) and the signal output interface (320) are connected with the vector network analyzer (500) through the high-frequency connecting wire and the high-low temperature control system (200), and the vector network analyzer (500) transmits an excitation signal to the signal input interface (310) and receives a response signal of the signal output interface (320).
5. The testing method of the surface mount filter temperature characteristic testing device is characterized by comprising the following steps of: Step 1, an operator puts a plurality of surface mount filters into corresponding test stations (120), closes a high-low temperature box door of a high-low temperature control system (200), and starts a test program after a temperature curve and test parameters are set on main control software of a main control computer (400); Step 2, a high-low temperature control system (200) drives the temperature in the high-low temperature box to reach a first preset point and stabilize; Step3, after the temperature is stable, the main control computer (400) controls the upper layer radio frequency switch (330) and the lower layer radio frequency switch (340) to sequentially switch channels; Step 4, for each channel, the main control computer (400) triggers the vector network analyzer (500) to scan parameters of the surface mounting filter of the channel, and data is uploaded to the main control computer (400) for storage, and the data file name comprises station numbers and temperature information; Step 5, after all the channels are tested, the high-low temperature control system (200) drives the temperature to go to the next preset point and is stable; And 6, repeating the steps 3-5, and automatically generating a comprehensive test report by the main control computer (400) after all temperature points are tested.

Description

Device and method for testing temperature characteristics of surface-mounted filter Technical Field The invention relates to the technical field of electronic component testing, in particular to a temperature characteristic testing device of a surface-mounted filter. The invention also relates to a testing method of the surface mount filter temperature characteristic testing device. Background The surface-mounted filter is a key component in the fields of modern communication equipment, consumer electronics and the like, and performance parameters (such as center frequency, passband width, insertion loss, in-band fluctuation and the like) of the surface-mounted filter can deviate along with the change of ambient temperature, so that the accurate and efficient test of the temperature characteristics of the surface-mounted filter is very important in the production, inspection, reliability evaluation test and product research and development processes. Currently, a common test method is to place the filter and test fixture together in an incubator, and to make measurements via a coaxial cable through the wall of the incubator in connection with an external Vector Network Analyzer (VNA). This method has the following disadvantages: 1) The efficiency is extremely low, the traditional test method can only test one or a small number of samples at a time, and cannot perform batch rapid test, so that the time and the energy are consumed. 2) The temperature stability is poor, and the frequent opening and closing of the door causes severe fluctuation of the temperature field in the box, so that the test can be started after long-time stabilization, and the efficiency is further reduced. 3) The connection is unreliable, the long cables inside and outside the incubator can introduce larger insertion loss and phase error, and frequent opening and closing of the refrigerator door easily causes loosening of the circuit connector and poor contact between the sample and the test fixture, thereby affecting the test precision. 4) The consistency is poor, the bending degree and the clamp position of the cable tested each time can be different, and extra measurement errors are introduced. 5) The automation degree is low, manual intervention is needed in the whole test process, full-automatic temperature circulation and data acquisition cannot be realized, the labor cost is high, and errors are easy to occur. Therefore, there is an urgent need for a surface mount filter temperature characteristic test apparatus and test method that can achieve high accuracy, high efficiency, and high reliability. Disclosure of Invention The first object of the present invention is to overcome the above-mentioned drawbacks of the prior art, and to provide a device for testing temperature characteristics of a surface mount filter. The second object of the present invention is to provide a testing method of the surface mount filter temperature characteristic testing device. In order to achieve the first aim, the technical scheme of the invention is that the temperature characteristic testing device of the surface mount filter is characterized by comprising an in-box testing unit and a main control and data acquisition system, wherein the in-box testing unit comprises a multi-station testing clamp system, a high-low temperature control system and an automatic switch switching system; The multi-station test fixture system is positioned in the high-low temperature control system and comprises a PCB circular plate, wherein a plurality of test stations which are uniformly arranged at intervals are integrated on the upper layer of the PCB circular plate along the circumference; The automatic switch switching system comprises a signal input interface, a signal output interface, an upper radio frequency switch and a lower radio frequency switch, wherein the signal input interface and the signal output interface are arranged on the side face of a PCB circular plate, the upper radio frequency switch is arranged in the center of the upper layer of the PCB circular plate, each input end pin of a test station is connected with the upper radio frequency switch through a high-frequency microstrip line, the lower radio frequency switch is arranged in the center of the lower layer of the PCB circular plate, each output end pin of the test station is connected with the lower radio frequency switch through a high-frequency microstrip line, the signal input interface is connected with a public port of the upper radio frequency switch through a high-frequency microstrip line and is connected with a main control and data acquisition system through a high-low temperature control system, and the signal output interface is connected with a public port of the lower radio frequency switch and is connected with the main control and the data acquisition system through a high-frequency connection line and a high-low temperature control system; The main control and data acquisit