Circularly polarized reconfigurable four-arm helical antenna

Abstract

The invention provides a circularly polarized reconfigurable four-arm helical antenna. The circularly polarized reconfigurable four-arm helical antenna comprises a radiation main body and a feed network. The on and off of a radio frequency diode are controlled through direct current bias, the radiation main body can be changed into a left-handed four-arm helix or a right-handed four-arm helix, simultaneously the output signals of the feed network are correspondingly adjusted to delay at 90 degrees anticlockwise in sequence or delay at 90 degrees clockwise in sequence, and then a reconfigurablefunction of left-hand circular polarization and right-hand circular polarization is realized. The circularly polarized reconfigurable four-arm helical antenna is compact in integral structure, smallin volume, relatively wide in directional diagram wave beam, good in front-to-rear ratio and relatively small in cross polarization, has a circularly polarized reconfigurable function, so that the antenna is conveniently applied in circularly polarized wireless communication systems such as radio frequency identification and satellite communications.

Description

technical field [0001] The invention relates to the field of antenna equipment in the field of radio frequency identification and satellite communication, in particular to a circularly polarized reconfigurable four-arm helical antenna. Background technique [0002] The circularly polarized reconfigurable antenna is an antenna that can generate and receive left-handed circularly polarized waves and right-handed circularly polarized waves. Due to its ability to improve communication system capacity, provide polarization diversity, reduce multipath propagation environment signal fading, and suppress rain and fog interference And other superior performance, it has been widely concerned and applied in wireless communication systems such as satellite communication and radio frequency identification. [0003] The quadrifilar helical antenna can generate excellent circularly polarized waves with wide beam width, good front-to-back ratio and low cross-polarization, which is very suit...

AI Technical Summary

Problems solved by technology

[0004] Ordinary quadrifilar helical antennas can only generate or receive circularly polarized waves in one direction, but current data show that quadrifilar helical antennas with reconfigurable circular polarization have not yet been realized.

In addition, most of the common four-arm helical antenna feed network occupies a large area, which limits its application in radio frequency identification handheld devices and other occasions

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