Dual beam phased array antenna with wide scan angle for repeater applications

Abstract

A dual polarized, dual beam phased array antenna with wide scan angle capabilities was designed and manufactured for repeater application. Two fixed feeding networks were designed and manufactured for the dual beams. With the feed networks, one broadside main beam and one tilted main beam were generated. The antenna achieved good isolation of -35.5 dB between the two main beams (broadside and tilted beam) within the frequency band of interest (2.5-2.7 GHz). The return loss for the broadside feed network port was found to be below -7.5 dB and return loss for the tilted beam feed network port was less than -15 dB. The side lobe levels for the broadside beam and the tilted beam were -12 dB and -8 dB down, respectively. The cross-polar level for the broadside beam was lower than -20 dB at the center frequency both in the elevation plane and in the azimuth plane. Also, for the tilted beam the cross-polar level in elevation plane was measured to be as low as -20 dB at the centre frequency.