Rhombic Slotted Pentagonal Patch Antenna for GPS Applications

Abstract

Circularly-Polarized (CP) pentagonal micro-strip patch antenna with five asymmetric rhombic slots is proposed for global-positioning system applications. Five unequal (asymmetric) rhombic-slots are etched at the corners of the pentagonal micro-strip radiator for CP-radiation. The overall size of the proposed slotted pentagonal patch is $0.373\boldsymbol{\lambda}_{\mathbf{o}}\times 0.373\boldsymbol{\lambda}_{\mathbf{o}}\times 0.008\boldsymbol{\lambda}_{\mathbf{o}}$ at 1.575 GHz. The simulated 3dB axial-ratio (AR) band-width of the proposed pentagonal micro-strip antenna is 30 MHz (1.53-1.56 GHz) and10dB Return Loss (RL) band-width is 60MHz(1.53- 1.59 GHz) with a gain of more than 3.8dBic. The S11 is measured with a network analyzer and the practical results are in close-agreement with the simulated.