Active broadband matching method of short-wave frequency-band electrically small antenna and matching circuit thereof

Abstract

The invention discloses an active broadband matching method of a short-wave frequency-band electrically small antenna and a matching circuit thereof, the electrically small antenna is matched by a non-Forster reactive element and a passive broadband matching network, the non-Forster reactive element is realized by a negative impedance converter, the negative impedance converter and the passive broadband matching network are cascaded into an active broadband matching network with two ports, one port of the matching network is connected with the electrically small antenna, and said two ports are connected with an emitter / receiver. In the invention, the non-Forster reactive element and the passive broadband matching network are comprehensively considered, led loss is regulated in realization process of the non-Forster reactive element, single traditional negative capacitor can be replaced by in series connecting a negative capacitor and a negative inductor to better neutralize the impedance imaginary part, a transmission line transformer is led into the matching network, and the deviation between a testing value and a design value can be compensated by slightly adjusting the transformation ratio of the transmission line transformer.

Description

technical field [0001] The invention relates to the fields of electromagnetic fields and electromagnetic waves, in particular to an active broadband matching method and a matching circuit for an electrically small antenna in a short-wave frequency band. Background technique [0002] Shortwave communication refers to radio communication using electromagnetic waves with a frequency of 3MHz to 30MHz. Sometimes the high frequency band of medium wave 1.5MHz to 3MHz is also classified as shortwave frequency band. Shortwave communication has been widely used in government, military, diplomatic, meteorological, commercial and other departments for many years, especially in the military department. It has always been one of the important means of military command. Due to the low frequency of the short-wave band (1.5MHz~30MHz) and the corresponding long wavelength (10m-200m), the size of the short-wave antenna designed to meet the requirements of antenna miniaturization is often less ...

AI Technical Summary

Problems solved by technology

When the reactance component is much larger than the resistance component and both seriously deviate from the characteristic impedance of the feeder, two significant problems will be caused: one is that the antenna and the feeder are seriously mismatched; the other is that the energy stored by the antenna is much greater than the energy radiated, at this time The antenna is equivalent to a capacitor with a small amount of radiation capability

However, the current common active broadband matching methods for electrically small antennas often only consider the realization of non-Foster reactive elements and do not consider the further matching work after the non-Foster reactive elements offset the imaginary part of the impedance of the electrically small antenna, nor consider the realization of Losses introduced by non-Foster reactive elements

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