Intelligent impedance matching device of LC resonant antenna

Abstract

The invention relates to an intelligent impedance matching device of an LC resonant antenna. With the intelligent impedance matching device adopted, problems such as manual matching, long time matching, complicated process and low precision in an existing antenna impedance matching method can be solved. The intelligent impedance matching device includes the LC resonant antenna, an adjustable matching circuit unit, a test circuit unit and a micro controller; a planar spiral inductor and a parallel plate capacitor are connected in series so as to form the LC resonant antenna; the adjustable matching circuit unit includes an inductor, a first adjustable capacitor array and a second adjustable capacitor array which are in pi-shaped impedance matching network connection; the test circuit unit includes a signal generator; a Wheatstone bridge is connected between two ends of the signal generator; and four bridge arms of the Wheatstone bridge respectively are a first resistor, a second resistor, a third resistor and the adjustable matching circuit unit. The intelligent impedance matching device of the invention has the advantages of high matching efficiency, short matching time, simple matching process, high matching precision and low cost, and can be greatly adaptive to the development of some handheld RF devices.

Description

technical field [0001] The invention relates to an impedance matching device, in particular to an intelligent impedance matching device for an LC resonant antenna. Background technique [0002] In some non-contact signal transmission occasions, such as radio frequency identification (RFID, Radio Frequency Identity) technology, passive wireless detection of LC resonant sensors, etc., the wireless coupling signal transmission method is used for non-contact two-way communication to achieve non-contact information transmission and through all The transmitted information achieves the purpose of identifying and detecting objects. Wireless coupling signal transmission is realized through the mutual inductance coupling of two inductance coils. In the case of long-distance mutual inductance coupling, it is necessary to increase the energy of the signal transmitting antenna end, so it is necessary to perform impedance matching on the signal source and the transmitting antenna to maxim...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an intelligent impedance matching device for LC resonant antennas in order to solve the existing methods for antenna impedance matching that still focus on manual matching, and there are problems such as long matching time, complicated matching process, and low matching accuracy.

The design concept and method of the device of the present invention can solve the problems of transmission efficiency and transmission distance of the LC resonance antenna without changing the design of the structure of the LC resonance antenna

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