CST – Computer Simulation Technology

Low Profile Cavity-Backed Four-Arm Archimedean Spiral Antenna with 8:1 Bandwidth

Title:
Low Profile Cavity-Backed Four-Arm Archimedean Spiral Antenna with 8:1 Bandwidth
Author(s):
Hongzhao Ray Fang, Mohammed Serhir, Ramanan Balakrishnan, Régis Guinvarc’h, Koen Mouthaan
Vol./Issue/Date:
1st January 0001
Year:
2014
Page(s):
1-4
Keywords:
Archimedean spiral antenna, wideband, cavity
Abstract:
A wideband circularly polarized, four-arm Archimedean spiral antenna backed by a low-profile metallic cavity of 15 mm (0.03? at the lowest frequency) with a 8:1 bandwidth from 0.6 GHz to 5 GHz is presented. A feed network comprising of a 90° wideband hybrid connected to two 180° hybrids excites the spiral antenna in the fundamental mode. For the entire 8:1 bandwidth, the measured input return loss of the system is more than 11.4 dB. Despite the low-profile cavity, the measured boresight gain and axial ratio of the antenna is -1 to 8.7 dBi and less than 2 dB respectively.
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