Isolation enhancement in wideband dual-polarised suspended plate antenna with modified T-type probes

An isolation enhancement technique for a wideband (1.71-2.17 GHz) and ±45° linear dual-polarised suspended plate antenna is proposed. Isolation (S₁₂, S₂₁) between channels is improved by making extensions on suspended plates (SPs) 1-2 and inserting a vertical ungrounded vertical wall under SP-1. The modified T-type probes in this design provide better coupling and return losses (S₁₁, S₂₂) for wideband operation. Based on the numerical simulations and measurements, it is observed that 8.2 ± 0.5 dBi gain and 66° ± 6° symmetric azimuth and elevation radiation patterns are obtained. Return losses ≤ - 15 dB and isolation ≤ - 30 dB are achieved in the entire band. This antenna is suitable for base stations of mobile wireless communication systems (PCS, DCS and IMTS ).