Method for improving anti-interference capability of PCB, anti-interference PCB and terminal comprising anti-interference PCB

Abstract

Disclosed are a PCB board, a terminal and a method for improving an anti-interference capability of the PCB board. The method comprises: by setting an anti-interference antenna, enabling the impedance between a signal input terminal of an operation antenna of a PCB board and a common ground terminal of the PCB to be greater than the impedance between a signal input end of the anti-interference antenna and the common ground terminal.

Description

Technical field [0001] The invention relates to the field of PCB design, in particular to a method for improving the anti-interference of a PCB board and an anti-interference PCB board and its terminal. Background technique [0002] At present, PCB boards are more and more widely used. As PCBs have more and more functional application chips, their various baseband radio frequency chips are integrated on the same PCB motherboard, which causes the problem of electromagnetic mutual interference of PCB motherboards to be very prominent. On the common ground of the PCB board, we can often measure the interference signals of different frequency spectrums. These interference signals are radiated from the main board ground as the antenna. Some frequencies fall within the frequency band of the working antenna, which brings a lot to the working antenna signal. Interference. This is also the reason why people often find that the power sensitivity of the cable test is normal in the project,...

AI Technical Summary

Problems solved by technology

This is also the reason why people often find that the power sensitivity of the cable test is normal in the project, but the coupling OTA test finds that the index is very poor.

During the development of terminal PCB boards, interference signals can be measured on the common ground of the main board of many terminal projects. Some of these interference signals are within the RF working frequency band, and the interference signals are radiated through the ground, which affects the coupling performance of the terminal and the radiation area. The distance to the antenna is very close. Once the radiated in-band signal is strong, it will have a great impact on the wireless performance of the terminal. The improvement of this problem through radio frequency debugging has little effect. This kind of fault is also a common occurrence faced by smart terminals. permanent failure, and even affect the success or failure of the project when the failure is serious

The interference of the PCB working antenna has brought a lot of troubles to the terminal project, and it is also very difficult to solve

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