Study and Design of Single and Double Layer Square Patch Antennas for UWB Applications

Abstract

This paper presents the design of Single and Double Layer microstrip patch antennas for ultra-wideband applications. This structure consists of a square patch with a partial ground plane, fed by a 50[Formula: see text][Formula: see text] microstrip line. This antenna is designed for a system to detect malignant tumors by microwave imaging. Prototypes of the two antennas are fabricated and tested with a network analyzer. The proposed antenna can achieve an ultra-wide bandwidth with VSWR[Formula: see text]2 from 3.82[Formula: see text]GHz to 11.72[Formula: see text]GHz for single layer antenna and from 3.2[Formula: see text]GHz to 10.95[Formula: see text]GHz for double layer antenna, with stable and bi-directional radiation pattern. The gain is good and has a peak value of 6.5[Formula: see text]dBi. The simulation of this antenna has been performed using Ansoft High Frequency Structure Simulator (HFSS) and Computer Simulation Technology-Microwave Studio (CST).