Design And Research Of Terahertz Circularly Polarized Antenna Based On Reflector Structure

In recent years,the rapid development of terahertz technology has brought new requirements to terahertz antenna technology at the same time.The characteristics of terahertz wave wideband require that terahertz antennas have wideband performance;secondly,terahertz antennas mainly use reflector structures.When terahertz antennas are used in meteorological remote sensing,satellite communication,space exploration and other fields,the communication distance between systems is too far,and the path loss is too high,which requires high gain for terahertz antennas.However,some of the currently proposed terahertz circularly polarized antenna technologies rarely have the circularly polarized radiation performance of high-gain ultra-wideband at the same time.In order to make the terahertz antenna technology meet the needs of the above engineering applications and have engineering application value,this topic will conduct research on the high-gain ultra-wideband circularly polarized terahertz antenna technology and design two reflector-based structures working in the terahertz frequency band high-gain ultrawideband circularly polarized antenna.In this paper,the working principle of these two antennas is analyzed and described,and the proposed antenna is simulated to test the relationship between its performance and the structure of each part of the antenna.The main research work includes the following three points:1.In the casse-type antenna structure,a circularly polarized antenna design with an axial ratio of less than 3dB is realized,the bandwidth reaches 38.5%,and it has other performances,which provides engineering reference for the future design of the casse-type circularly polarized highgain antenna.2.A mountain-shaped ultra-wideband circularly polarized reflective element operating at 110GHz-170GHz is proposed,the proposed ultrawideband circularly polarized reflective element has a circular polarization axial ratio bandwidth of 42.8%in the working frequency band.By adjusting the structural parameters,the phase of the reflective element can be covered from 0° to 360°.Circularly polarized reflective element can use in designing planar reflector arrays.3.A circularly polarized planar reflect array antenna including a casse structure,a offset structure and a forward-feed structure is designed using the mountain-shaped reflector element,and finally a high-gain ultrawideband circularly polarized planar reflect array antenna is optimized and designed.The antenna’s work band is from 110GHz to 170GHz.The maximum gain reaches 26.7dBi,the circular polarization axial ratio bandwidth reaches 42.8%,and the cross-polarization isolation reaches more than 16dB.