Open AccessBroadband Fabry‐Pérot radiation based on non‐Foster cavity boundary
Author(s) -
Debogović T.,
Hrabar S.,
PerruisseauCarrier J.
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2012.4050
Subject(s) - directivity , fabry–pérot interferometer , broadband , bandwidth (computing) , radiation , optics , antenna gain , acoustics , resonance (particle physics) , antenna efficiency , antenna (radio) , physics , materials science , engineering , radiation pattern , telecommunications , wavelength , particle physics
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.