Dual Beam Phased Array Antenna with Wide Scan Angle For Repeater Applications

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 -35.5dB 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 -7.5dB and return loss for the tilted beam feed network port was less than -15dB. The side lobe levels for the broadside beam and the tilted beam were -12dB and -8dB down, respectively. The cross-polar level for the broadside beam was lower than -20dB 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 -20dB at the centre frequency