1 GHz Programmable Analog Phase Shifter for Adaptive Antenna

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
0.8um silicon bipolar technology, with a 10 GHz fT. 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.