LAUSR

ABSTRACT Design and analysis of a microwave passive network providing multiple phase difference of 0°, 90°, 180° and 270° within broadband 2.6 GHz to 4.0 GHz is proposed and experimentally verified. The network consists of a wideband microstrip balun, two double coupled line 90° phase shifters and three Wilkinson power dividers. The device has −10 dB impedance bandwidth of 42% and its insertion loss varies from 7.55 dB to 7.86 dB within the band. The measured amplitude and phase imbalance between four output ports are within 0.3 dB and ±6° respectively over the required band. The measured isolation among different output ports of the device are below −15 dB. The broadband multiple phase shifting characteristic with equal amplitude value, simple microstrip design technique make the device suitable for polarization agile antennas and an alternative over existing single phase shifters used in many wireless systems.