Compact Ultra-Wideband Archimedean Spiral Antenna for Electronic Warfare System

In this paper, a circularly polarized Archimedean spiral antenna is presented having an ultra-wide band (UWB) frequency of operation from 800 MHz to 6 GHz. The spiral antenna is designed taking dual arm Archimedean spiral and the width of the arms has been optimized to get a compact design with a diameter of 130 mm. The proposed antenna shows a larger fractional bandwidth of 152.9 % compared to other spiral antennas in this frequency range. The measured VSWR shows a very good agreement with simulation result. The Archimedean spiral antenna operates from 800 MHz to 6 GHz with a VSWR less than 2:1. The proposed antenna can have wide application such as for global positioning system (GPS), electronic warfare (EW), 5G communication system, weather radar, etc.