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Influence of residual air gaps on characteristics of circularly polarised aperture-coupled millimetre-wave microstrip antennas

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2 Author(s)
R. Sauleau ; Inst. d'Electronique et de Telecommun. de Rennes, Univ. de Rennes I, France ; Ph. Coquet

The influence of residual air gaps located between the two substrates of aperture-coupled printed antennas is investigated theoretically and experimentally in the 60 GHz band. It is shown that the input impedance and the axial ratio of thin-film circular polarisation patches and arrays are strongly altered by small gaps a few micrometres thick. An alternative configuration, comprising two ground planes and compatible with photolithographic processes, is then proposed to overcome this drawback.

Published in:

Electronics Letters  (Volume:39 ,  Issue: 12 )