Dual‐band circularly‐polarised Spidron fractal microstrip patch antenna for Ku‐band satellite communication applications

Abstract

A dual‐band circularly‐polarised antenna implemented on a single substrate is proposed for Ku‐band satellite communication. A microstrip‐fed Spidron fractal patch is utilised to achieve dual‐band resonance and circular polarisation. The proposed antenna, with dimensions of 50 × 50 × 1.52 mm 3 , has also been fabricated and tested. The measured −10 dB reflection bandwidths are 8.7% (11.44–12.48 GHz) and 6.6% (13.47–14.39 GHz), exhibiting a small resonant frequency ratio of 1.15. The 3 dB axial ratio bandwidths for the lower band and the upper band are 2.96 and 1.68%, respectively.