Circularly polarized sequentially rotated gap — coupled elliptical microstrip antennas array

In this paper a single fed elliptical microstrip antenna to realize circular polarization in 1000 MHz frequency band is proposed. It yields axial ratio bandwidth of 10 MHz (~1.2%). A sequentially rotated gap coupled configuration with a single parasitic patch along x axis is studied. Thereafter, gap coupled array along x and along y axis, i.e., a plus shaped array is studied to increase the ARBW. Also, 3×3 array is presented which provides return loss bandwidth and axial ratio bandwidth of 44MHz and 30MHz respectively with a gain of 1.5dBi for non-suspended configuration. For gain increment, suspended single elliptical microstrip antenna is proposed, which provides axial ratio bandwidth of 12 MHz and gain of 7dBi. The proposed gap coupled configurations yields broadside radiation pattern over entire bandwidth with antenna gain of more than 9dBi in their suspended variation. The proposed configuration can find applications in mobile communication environment in 1000 MHz frequency band and can also be tuned to a required frequency in the given range.