A Compact Multiband Microstrip Patch Antenna Loaded with CSRR for Wireless Applications

The purpose of this paper is to design a compact size multiband antenna for wireless applications. The proposed antenna is loaded with circular CSRR on the radiating patch whereas the ground plane is loaded with multiple rings of rectangular CSRR. The dimension of proposed antenna is 16mm x 19mm x 1.6mm, which resonates at 3.1 GHz, 4.4GHz and 4.8GHz frequencies with a return loss of -11.96dB,-12.46dB and 16.15 dB respectively. These frequency bands are assigned for Wi-Max, military and commercial applications which are highly demanding areas in wireless field. The finite element based High Frequency Structural Simulator (HFSS) version 14.0 is used to design and simulate the proposed antenna. The proposed antenna has an acceptable return loss and also achieves stable radiation pattern for all resonating frequencies. The material used in the design of substrate is FR4 with the relative permittivity of 4.4. The conductive material chosen for the design of patch and ground plane is copper.