Impedance matching adjustable broadband rectification antenna based on resonance structure

Abstract

The invention provides a matching adjustable broadband rectification antenna based on a resonance structure. The antenna comprises a receiving antenna and a rectification circuit based on adjustable branches of the resonance structure, the rectification circuit sequentially comprises a pre-capacitor, a rectification topological structure, a matching circuit, an output filter and a load in the energy flowing direction. The resonance structure and a matching branch knot are connected in series and then inserted between the front capacitor and the rectification topological structure. The impedance of the matching branch knot is adjusted through the impedance change of the resonance structure under different frequencies, so that the impedance of the rectification circuit under each frequency in the whole broadband is adjusted; and the impedance comprises a real part and an imaginary part of the impedance of the rectification circuit. According to the invention, an inductance-capacitance series-parallel resonance structure is adopted; the on or off state of the adjustable switching device and the impedance adjustable characteristic of the variable capacitance adjustable diode are simulated along with the change of the frequency, and the matching branch knot is converted into an adjustable matching branch knot, so that the impedance of the rectifying circuit is changed along with thechange of the frequency, and good impedance conjugate matching with the receiving antenna is adaptively realized.

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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