Rectangular microstrip antenna loaded with offset U-slot and rectangular slot for wideband and circular polarized response in GSM 900 and GPS L5 band applications

Wideband and circular polarized designs of rectangular microstrip antennas employing offset positions of the U-slot and rectangular slot are presented. Query ID="Q1" Text="'EXTC' expand" An inter-spacing between the patch TM10, TM11 and TM02 resonant modes is optimized due to the presence of two offset slots that yields a wideband response with the presence of circular polarized bandwidth towards the higher frequencies, thus providing separate regions for the two responses. In 900 MHz spectrum, the proposed design yields maximum impedance bandwidth of 298 MHz (32.07%) with an axial ratio bandwidth of 13 MHz (1.26%). The proposed designs exhibit pattern maximum in the broadside direction with a gain of larger than 6 dBi. Simulated results have been verified using the experimentation, which shows close agreement.