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Two-dimensional beam-scanning linear active leaky-wave antenna array using coupled VCOs

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3 Author(s)
Hu, C.C. ; Inst. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Jou, C.F. ; Wu, J.J.

An active phased-array design for electronic two-dimensional beam scanning using a phase-shifterless linear one-dimensional active leaky-wave antenna array is demonstrated. The varactor-tuned voltage-controlled oscillators (VCOs) and coupling network are implemented in this array. Three coupling networks are designed and compared for optimum coupling strength between each VCO element. The measured pattern of a 4×1 active leaky-wave antenna array shows that the main beam can be continuously scanned from 68° to 40° in elevation, as the frequency varies from 8.24 GHz to 9.15 GHz. This is equivalent to over 10% electronic tuning bandwidth. By tuning the free-running frequencies of the end elements, the main beam can be continuously scanned from -26° to +10° from broadside with azimuth symmetry in a conical scan manner

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Microwaves, Antennas and Propagation, IEE Proceedings  (Volume:147 ,  Issue: 1 )