Dual Band Circularly Polarized Microstrip Antenna Fed By Inverted-L Shaped With A Stub for GPS And WLAN Application

Abstract

A design of dual-band circularly polarized microstrip antenna for Global Positioning System and WLAN application is presented. This antenna proposed an inverted-L shaped with a stub as a feedline to achieve dual resonant frequency and characterize polarization of the antenna. From the simulated and measurement result showed this antenna can operate at frequency 1575.42 MHz and 2450 MHz. At those frequencies, it has right-hand circular polarization where its circular polarization bandwidth is 57.1 MHz and 223.2 MHz respectively. Using FR4-Epoxy dielectric substrate, measured GPS frequency obtained 1.49 dBi of gain while at WLAN frequency has 3.16 dBi.