ASYMMETRIC MICROSTRIP ANTENNA FOR S-BAND

E&TC

In this,a circularly polarized asymmetric slits, high gain, a small patch antenna dedicated for wireless applications is showed.Four v-shaped slits in the diagonal directions on the square patch and a two parasitic elements of same dimensions are used to create circularly polarized (CP) radiation with a large axial ratio beamwidth. A proposed of the antenna has been design with a 1.6 mm thick single layer FR4 substrate having relative permittivity of 4.4.The simulated 3-dB axial ratio (AR) bandwidth of the proposed antenna is 75 MHz (2.44–2.53 GHz) and a 10-dB return loss bandwidth is 63.0 MHz (2.41–2.45 GHz) with a gain of more than 6.8dB.The overall size of the antenna is 56mmx56mmx1.6mm.Also,effects of with parasitic element to improve more gain are examined and discussed here . All the simulations results are performed using HFSS software package and Simulation results are performed,showing that this antenna realizes the required parameters in terms of frequency bandwidth, gain, circular polarization bandwidth, and axial ratio (AR) beamwidth. Keywords— Circular polarization, axial ratio, patch antennas, wireless application

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