24 GHz Dielectric Resonator Antenna for MMW Automotive Radar

Abstract

A cylindrical dielectric resonator antenna (CDRA) is proposed for millimeter wave (MMW) automotive radar (AR) systems. The antenna has moderate gain and beamwidth, good cross-polarization (XP) suppression, relative wide bandwidth, and another adjacent potential band. The antenna operates at 24 GHz, leading to very small size. In order to meet the requirements of fixation and alignment, an extra fixture is co-fabricated with the substrate made of the same material. The effect of the fixture on the dielectric resonator antenna is investigated by simulation. It is found that with the fixture, which has much shorter height and lower permittivity, the dielectric resonator stays almost unchanged in terms of resonant mode, resonant frequency, Q factor, and internal field. The antenna has a gain of 6 dB, a XP suppression of more than 40 dB, and a bandwidth of 22.6% at 24 GHz.