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A retrodirective antenna array using a spatially fed local oscillator

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2 Author(s)
Forsyth, W.E. ; Hawaii Center for Adv. Commun., Hawaii Univ., Honolulu, HI, USA ; Shiroma, W.A.

This work investigates a spatially fed local oscillator (LO) for a retrodirective antenna array. Compared to conventional planar transmission-line feed networks, the spatial feed offers a more flexible array layout and easier implementation, especially in large two-dimensional (2-D) arrays. This method of delivery involves radiating the LO through free space to the back-side of the array where it is received by slot-coupled patch antennas and delivered to the mixing elements. A four-element linear retrodirective array utilizing this approach is demonstrated at an LO frequency of 10.7 GHz. Retrodirectivity is observed at scan angles from -40° to +40°

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Antennas and Propagation, IEEE Transactions on  (Volume:50 ,  Issue: 5 )