Isolation Enhancement of 3GHz Probe Fed Rectangle Microstrip Patch Antenna by Second Resonance Suppression Technique for Wireless Applications

Abstract

Microstrip patch antenna is very popular and extensively used in GHz wireless communications. The demand of increased wireless communication applications, needs increase in bandwidth, gain, efficiency and isolation of microostrip patch antenna. Microstrip patch antenna is a low profile antenna but has narrow bandwidth, low gain, low efficiency and isolation. In this paper a microstrip patch antenna is designed with 1.6mm RT Duroid substrate material. The bandwidth, gain and isolation were found to be 60MHz, 7.5dB and -40dB with dual resonance. The bandwidth and isolation enhancement is achieved withsecond resonance suppression technique. The second resonance suppressed by using two slots. Simulations were conducted with different lengths of slots and at different positions and compared. A bandwidth of 270MHz, gain of 7.9dB and an isolation of -46dB are obtained. Bandwidth increase of 450% and 115% isolation increase are achieved.