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Broadband Fabry-P??rot radiation based on non-foster cavity boundary

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3 Author(s)
Debogović, T. ; Ecole Polytech. Fed. Lausanne (EPFL), Lausanne, Switzerland ; Hrabar, S. ; Perruisseau-Carrier, J.

Fabry-Pérot (FP) cavities having at least one partially reflective surface are widely used as compact and efficient high-directivity radiators. However, they inherently suffer from very narrow directivity bandwidths around the FP resonance. Here it is shown that this constraint can be overcome by using an active non-Foster cavity boundary behaving as a series negative LC tank circuit. Analytical and full-wave numerical results reveal the possibility of nearly tenfold improvement of -1 dB directivity bandwidth while preserving the original overall antenna size and directivity of the antenna.

Published in:

Electronics Letters  (Volume:49 ,  Issue: 4 )