High isolation dual band dual polarized antenna
A new configuration of the dual-band and dual-polarized antenna is presented, which is fed by aperture coupling for the existing mobile communication systems working over 870–960 MHz (GSM) and 1710–2180 MHz (DCS/UMTS) frequency band. In this paper DU band stands for DCS/UMTS band. Measurement results show that the proposed antenna yields good broadside radiation characteristics including symmetric radiation patterns, low cross-polarization level ( 20 dB) and high isolation (> 30 dB) at both bands. The designed antenna has an impedance bandwidth of 20.4% (790–970 MHz) for VSWR < 1.5 in the lower band and 29.3% for VSWR < 1.6 (1630–2190 MHz) in the upper band. The measured average gains are about 9.3–10.2 and 8.6–10 dBi in the lower and upper band, respectively. It is also promising for array antenna in various wireless systems.