A Phase-Locking Method for Beam Steering in Active Array Antennas
- 1 June 1974
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Microwave Theory and Techniques
- Vol. 22 (6) , 698-703
- https://doi.org/10.1109/tmtt.1974.1128313
Abstract
A new principle for phase shifting, and hence beam steering, on an active array antenna is described. Each individual RF source is phase locked by a stable locking signal which is close in frequency to the nth harmonic of its free-running frequency. Pulses of appropriate amplitude and duration applied to the dc circuitry cause the fundamental output frequency of the RF source to shift in phase by increments of 2/spl pi//n. The construction and testing of a four-element L-band (1-GHz) array using transistor oscillators locked at S-band (4 GHz) to give 90/spl deg/ phase increments is described.Keywords
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