Matching method of radio frequency antenna of tire pressure monitoring sensor based on valve core antenna

Abstract

The invention relates to the technical field of radio frequency debugging, in particular to a matching method of a radio frequency antenna of a tire pressure monitoring sensor based on a valve core antenna. The matching method comprises the following steps: performing impedance matching on the antenna of the tire pressure monitoring sensor through an impedance matching network; mounting the tire pressure monitoring sensor that completes the antenna impedance matching on a hub, adjusting an impedance matching network parameter of the antenna, and detecting the antenna radiation field strength in a far field for matching and debugging; step C, when the tire pressure monitoring sensor that completes the antenna and hub matching is sealed by filling rubber, isolating rubber filling of a circuit component in the impedance matching network affected by sealing by filling rubber, and adjusting the impedance matching network parameter of the isolated circuit component, so as to complete the matching of a physical unit and 'the antenna plus the hub'. The method in the invention improves the emission intensity of the sensor and the radiation efficiency of the antenna, and solves the problem that the communication between the sensor and the receiver is unstable.

Description

technical field [0001] The invention relates to the technical field of radio frequency debugging, in particular to a matching method of a tire pressure monitoring sensor radio frequency antenna based on a valve core antenna. Background technique [0002] During the high-speed driving of a car, tire failure, especially a puncture, often catches the driver off guard due to its accidental and unpredictability, which is also one of the important reasons for sudden traffic accidents. In recent years, with the extensive deepening and application of automobile driving safety systems, in order to prevent tire blowouts and change passive safety into active safety, automobile tire pressure real-time monitoring system (Tire Pressure Monitoring System, TPMS) is gradually becoming an indispensable guarantee for vehicle driving safety. safety device. The TPMS system mainly consists of two parts: the tire pressure monitoring sensor installed on the wheel hub of the car and the receiver in...

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Problems solved by technology

[0004] 1. The front-mounted TPMS usually adopts a built-in sensor solution. The sensor module is separated from the outside world by wheels, which makes the anti-interference design of the sensor module’s antenna very difficult. There are generally problems of low transmission efficiency and serious system data loss.

When passing through the complex traffic electromagnetic environment, due to the poor anti-interference performance of the antenna, the sensor module is frequently disconnected from the receiver, which affects the performance of the entire TPMS;

[0005] 2. Since the rear-mounted TPMS mostly adopts an external solution, the antenna matching of the sensor module is easy to design

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