Metasurface Based Compact Dual Band Antenna with Wide Bandwidths

Abstract

A compact, dual band, unidirectional antenna backed by metasurface (MS) is proposed which operates over wide bandwidths. MS is composed of s shaped split ring resonator (SRR) like square unit cells providing zero reflection phase at two frequencies for dual band operation. Simple printed circular monopole antenna placed above MS functions as feed antenna. The proposed antenna operates over two wide bands from 4 to 6 GHz with 40% bandwidth and from 6.8 to 9 GHz with 27 % bandwidth. Gain variations in band I is 5.9-6.8 dBi with 65% efficiency and in band II is 6.7-7.9 dBi with 70% efficiency. Antenna is fabricated on FR-4 substrate and its performance is verified experimentally.