Design And Analysis Of Compact Circularly polarized asymmetric V-shaped slits patch antenna for S-band Applications

Abstract

In this paper, a circularly polarized asymmetric slits, high gain, a small patch antenna with low axial ratio dedicated
for S band satellite communications is presented. Four asymmetric V-shaped slits in the diagonal directions on the square
patches and a parasitic element are added to create circularly polarized (CP) radiation having large axial ratio beamwidth. A
proposed of the antenna has been design with a 1.6 mm thick single layer FR4 substrate with a relative permittivity of 4.4. The
simulated 3-dB axial ratio (AR) bandwidth of the proposed antenna is 41 MHz (2.41–2.46 GHz) having a 3-dB AR beamwidth
of nearly 180◦ across the bandwidth and a 10-dB return loss bandwidth is about 60.0 MHz (2.43–2.49 GHz) with a gain of
more than 6.2 dB. The overall size of the antenna is 56mmx56mmx1.6mm. In addition, effects of with parasitic element to
improve more gain are examined and discussed in detail. All the simulations results are carry out using HFSS software
package and Simulation results are given, indicating that this S band antenna realizes the required satellite specifications in
terms of frequency bandwidth, gain, circular polarization bandwidth, and axial ratio (AR) beamwidth.