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Circularly Polarized Slit Loaded Broadband Coplanar Capacitive Coupled Probe Fed Microstrip Antenna for Wireless Communication System

Ratnesh Dwivedi, Prashant Purohit

In this paper we propose a circularly polarized coplanar capacitive fed rectangular patch Microstrip antenna loaded with I-shape slots and two slits within the patch. The model of Antenna uses the capacitive feed strip which is fed by coaxial probe using equivalent circuit approach. The circular polarization is achieved by introducing two slits of equal dimension to produce the orthogonal modes. The proposed antenna has an axial ratio bandwidth (<3dB) of 5.08% and impedance bandwidth (S11<10dB) of 60% in the frequency range 3.82GHz to 7.11GHz which shows wideband characteristics. Gain is almost constant in the entire band of operation. The proposed antenna is simulated using IE3D software. It is shown that the antenna can cover the bands of several applications including WLAN, Satellite communication, Marine communication and terrestrial microwave links.