CIRCULAR POLARIZATION-AGILE MICROSTRIP ANTENNA FOR WIRELESS ACCESS IN VEHICULAR ENVIRONMENTS

摘要

In this article, a new reconfigurable microstrip antenna with circular polarization-agile capability is presented for wireless access in vehicular environments (WAVE). The proposed antenna consists of a circular microstrip radiator on a back-sided circular slot with an adding tab and a trimmed slot with two PIN diodes. The circular slot in the ground acts as a perturbing element to generate both left and right-handed circular polarization without shifting the resonant frequency. Both of circular polarization senses can be successfully alternated by controlling the states of diodes. The implemented antenna shows a good agreement with the simulation results and excellent controllability with symmetrical radiation at the identical resonant frequency.