1 GHz programmable analog phase shifter for adaptive antennas

This paper describes a programmable analog phase shifter operating at 1 GHz. This has application in adaptive antenna systems, where variable phase shifters are used to steer the directivity of the antenna array. The circuit is fabricated in 0.8 /spl mu/m silicon bipolar technology, with a 10 GHz f/sub T/. The resulting chip area is small enough to allow 16 complete phase shifter circuits to be included in a single package, thereby allowing control of an array of 16 antenna elements. This approach in constructing adaptive antenna is highly inexpensive compared to the use of bulk microwave phase shifters.