Impedance Matching Adjustable Broadband Rectenna Based on Resonant Structure

Abstract

The invention provides a broadband rectifying antenna with adjustable matching based on a resonant structure, including a receiving antenna and a rectifying circuit based on an adjustable branch of a resonant structure; the rectifying circuit is sequentially composed of a front capacitor, a rectifying topology, a matching circuit, Output filter and load; the resonant structure and the matching branch are inserted in series between the precapacitor and the rectification topology; through the impedance change of the resonant structure at different frequencies, the impedance of the matching branch is adjusted, thereby adjusting the rectification circuit in the entire broadband. The impedance at a frequency includes the real and imaginary parts of the rectifier circuit impedance. The invention adopts the series-parallel resonance structure of inductance and capacitance, and simulates the closed or disconnected state of the adjustable switching device and the impedance adjustable characteristic of the varactor adjustable diode as the frequency changes, and converts the matching branch into an adjustable matching branch, so that the rectifier circuit The impedance is changed as the frequency changes, and a good impedance conjugate matching with the receiving antenna is realized adaptively.

Description

technical field [0001] The invention relates to the field of rectennas, in particular to a wideband rectenna with adjustable impedance matching based on a resonant structure. Background technique [0002] Microwave energy transmission means that energy is transmitted to the receiving end through free space in the form of microwaves (radio frequency energy), and the received radio frequency energy is converted into DC energy. Among them, the rectenna is one of the important components in the microwave energy transmission system. It is composed of a receiving antenna and a rectifying circuit. The receiving antenna will receive the incoming radio frequency wave in the space, and the rectifying circuit at the back end will rectify it and convert it into DC. energy. With the development of communication technology, there are many radio frequency transmitting devices, such as signal towers, TV broadcasting towers and mobile phone base stations, which transmit radio frequency sign...

AI Technical Summary

Problems solved by technology

However, this increases the design difficulty of the receiving antenna, and the rectification circuit and the antenna are still not well matched, but the mismatch between the two has little effect on the high output impedance of the antenna

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