Circularly Polarized Dual Frequency Hexagonal Microstrip Patch Antenna for X-band Applications

Abstract: A low profile Hexagonal microstrip patch antenna is proposed which operates in the X-band and resonates at 9.5GHz. It is observed to be linearly polarized with an axial ratio of 35.03 dB. Without changing the feed mechanism, circular polarization is achieved along with dual frequency operation. By cutting a slot in the hexagonal patch which extends up to edge of the patch, we obtain the resonant frequencies at 9.05 GHz and 10.05 GHz. The axial ratio for this patch antenna is found to be 2.85 dB. Since this value is below 3 dB, the antenna is said to be circularly polarized.

Keywords: Hexagonal Patch, Axial Ratio, Circular Polarization, Linear Polarization.