| Millimeter-wave lens antennas have been widely used in fields such as defense military,5G communication,and automotive radar.This paper proposes a two-dimensional elliptical Luneburg lens antenna for millimeter-wave applications,which aims to reduce the vertical size of the two dimensional circular Luneburg lens antenna.The specific research work is as follows:(1)A gradient refractive index formula of two-dimensional elliptical Luneburg lens is proposed and the ray tracing method is implemented in MATLAB.Based on the relationship between the exit angle and the incident angle,obtained by ray tracing method,is used to study the proposed elliptical lens,we analyzed focusing characteristics and scanning capabilities of the lens.In order to balance the contradiction between the choice of lens material and the size of the feed,we designed a two-dimensional planar elliptical lens that meets the scanning requirements.(2)A partially dielectric-filled parallel-plate waveguide which propagating TM mode is utilized to achieve the required gradient refractive index's distribution of previously mentioned elliptical Luneburg lens at millimeter wave and an H-plane horn array is used as the feed to achieve multi-beam scanning.The elliptical Luneburg lens antenna is then designed and simulated by using CST-MWS,which exhibits a gain of 16.2dBi and aperture efficiency of 66.1%,and scanning angle of ±35°with gain drop less than 2dB at 60GHz.In the frequency range of 58.5 GHz to 68.5 GHz,a return loss better than-10dB and aperture efficiency more than 53%is achieved. |
PDF Full Text Request