A SHARED APERTURE MULTIFUNCTION DUAL POLARIZED DUAL BAND ANTENNA FOR BASE STATION APPLICATIONS

This paper presents a novel arrangement of dual polarized dual band antenna in shared aperture concept. It consists of multifunction feature for base station applications in a single radome with low profile and compact size. In this work two varieties of antennas working in separate bands are integrated in a single aperture, an aperture coupled patch antenna for covering low frequency band operation and for High frequency band a printed broadband cross dipole antenna were used. Both antennas shares the common aperture and making it suitable for multifunction application with orthogonal linear (+45/-45) slant polarization which is used for polarization diversity in the base station antennas. The Low band antenna covers GSM frequency band working over 0.698–0.960GHz and the second antenna operates in the band of 1.710–2.69 GHz frequency band, which is serving for 2G-3G-4G applications. The Returns loss (S11 = -10 dB) bandwidth of aperture coupled antenna is 31.6% (0.698– 0.960 GHz) and printed broadband cross dipole antenna has 44.5% (1.710–2.690 GHz). The measured S-parameters and pattern results are well matched with the simulation results