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Tracking antenna architectures based on a planar two-port microstrip patch mixer antenna

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2 Author(s)
Gupta, S. ; Dept. of Electr. & Electron. Eng., Queen''s Univ., Belfast, UK ; Fusco, V.F.

This paper describes the behavior of a compact two-port integrated mixer active antenna element with low cross polarization, high two-port circuit isolation, and good mixer detection sensitivity. Using this element as an elemental building block, a self-tracking antenna array has been realized which uses an in-band carrier signal for self calibration. The array is relatively insensitive to absolute carrier power level and is capable of tracking incoming signals over ±80°. By minor alteration of the antenna topology, a minimum complexity variant of a heterodyne retrodirective array has been demonstrated over a ±40° retransmission angle. Finally, the use of the antenna in conjunction with an injection-locked voltage-controlled oscillator (VCO) is included in order to demonstrate ±35° phase-shifterless beam steering

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Antennas and Propagation, IEEE Transactions on  (Volume:45 ,  Issue: 12 )