Symmetric Pattern Patch Antenna For Yielding Circular Polarization

Abstract A rectangular patch with a symmetric pattern for obtaining circular polarization with an axial ratio of 2.2 dBi and the same antenna can be operated at multiple frequencies 1.26 GHz 1.73 GHz 2.16 GHz and 2.59 GHz suitable for GPS WLAN and WiFi applications is designed using IE3D software from Zeland. The microstrip patch is constructed using a single layer glass epoxy substrate having dielectric constant 4.3 and loss tangent tan 0.001.The patch is provided with a dual feed having 180 phase difference.