Antenna, feeding and adjusting network for TD-SCDMA base station

A collinear planar dipole antenna array, with its feeding and adjusting network, is designed, realized and tested. The antenna element comprises nine planar dipoles, fed by coaxial lines which were connected to a nine-way power divider. For each antenna element, measured SWR is less than 1.5 over the TD-SCDMA frequency band (1880-1920, 2010-2025 MHz); the 3 dB beam width is over 90deg in H-plane and more than 7deg in E-plane; the gain varies from 15.2 dB to 16.1 dB, satisfying the industry standard. Six antenna elements compose a larger array. A ldquo6+1rdquo adjusting board, used to get the signals in both transmit and receive mode for power adjusting, is also designed. The coupling factors between adjusting port and each elementpsilas port are about -26 dB, with a maximum variation of 0.7 dB.