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ALPSS: a millimetre-wave aperture-coupled patch antenna on a substrate lens

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4 Author(s)
G. V. Eleftheriades ; Lab. of Electromagn. & Acoust., Swiss Federal Inst. of Technol., Lausanne, Switzerland ; Y. Brand ; J. -F. Zurcher ; J. R. Mosig

The feasibility of millimetre-wave (MM-wave) aperture-coupled patch antennas, printed at the back surface of substrate-lenses is demonstrated and the corresponding radiation characteristics are investigated. A specific realisation of such an air-lens-patch-slot-strip (ALPSS) antenna on a low-permittivity ε r=4.0 extended hemispherical lens substrate is theoretically and experimentally characterised at 70 GHz. It is demonstrated that the ALPSS antenna exhibits clean, axially symmetric patterns of low cross-polarisation (26 dB), a directivity of 30.4 dB and the 3 dB pattern full-beamwidth remains within 6°-5° between 60-80 GHz. In addition, a very-high front-to-back (F/B) ratio, of the order of 50 dB is measured at 70 GHz, despite the absence of a backing ground-plane. The ALPSS antenna is well suited for low-cost broadband point-to-point communications and collision avoidance applications

Published in:

Electronics Letters  (Volume:33 ,  Issue: 3 )