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Two-dimensional planar passive retrodirective array

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2 Author(s)
Nair, B. ; Sch. of Electr. & Electron. Eng., Queen''s Univ. Belfast, UK ; Fusco, V.F.

A simple passive microstrip array design is introduced comprising four square microstrip patches interconnected with transmission lines to form a Van-Atta retrodirective array suitable as a building block in a larger two-dimensional self-tracking array. The resulting circuit measures 48×48×0.254 mm, operates at 10.24 GHz and yields 5 dB increase in return signal at bore-sight relative to a flat metal sheet having the same dimensions for incident linear polarisation. The -5 dB monostatic radar cross-section response is ±25° compared to ±12° measured for a flat metal sheet of equivalent dimensions. The reradiation characteristics of circularly polarised signals from the retrodirective structure are briefly discussed.

Published in:

Electronics Letters  (Volume:39 ,  Issue: 10 )