Design of reconfigurable circular polarization equilateral triangular antenna without and with air gap

Abstract

This paper presents a comparative performance study of an equilateral triangular patch antenna (ETPA) with and without an additional air gap substrate. The proposed antenna covers the S-band (2.4GHz-2.5GHz) for satellite communication. The antenna consists of truncated equilateral triangular patches connected at the truncated corners by two PIN diodes to the two parasitic triangular patches. A dual circular polarization is obtained by switching the PIN diodes in ON and/or OFF state. An additional air gap is introduced between the ground and the substrate to improve the gain and the bandwidth(sparameter and axial ratio).The simulated results demonstrate a 7.76 dBic realize gain, a return loss bandwidth of 195 Mhz and axial ratio bandwidth of 51 Mhz.