DESIGN OF A LOW PROFILE CIRCULARLY POLARIZED PRINTED SLOT ANTENNA USING CSRR

Abstract

This dissertation reports the design of a low profile circularly polarized printed slot antenna using complementary split ring resonator (CSRR). The slot has the annular ring geometry and is fed by L shape feed line which couples the two orthogonal sides of the ring to provide circular polarization. The antenna is meant for the broad band application therefore a wide ring slot is used. The distinguishing feature of the design is that it incorporates the concept of single negative metamaterial for low profiling of the antenna. In this dissertation the frequency gap produced by an array of complementary split ring resonators (CSRRs) etched on the ground plane is also discussed. This behavior is interpreted as due to the presence of a negative effective dielectric permittivity in the vicinity of resonance. This behavior of CSRR is utilized in the design of the antenna. Measured results show that antenna with CSRR reflector shows better performance than the antenna without CSRR reflector.