A Miniaturized Multiband Monopole Antenna With CSRR Loaded on Ground plane

Abstract

This paper presents a compact multiband planar antenna based on the inclusion of complementary split ring resonators (CSRR) in the ground plane. The antenna is composed of an inverted L monopole, that presents a 30% reduction length with respect to the conventional one, and a partial ground plane in which the CSRRs are etched to generate the multiband characteristic. First, two equal radius CSRRs are etched in the ground plane and excited by a meandered microstrip feed line. As a result a broad dual band frequency. Secondly, a stub feed is introduced to create a triple band by making the CSRRs's radius different. For both cases simulations and measurements show good agreement.