Title :
94 GHz zonal ring reflector for helicopter collision avoidance
Author :
Nguyen, B.D. ; Migliaccio, C. ; Pichot, C.
Author_Institution :
Lab. d´´Electronique Antennes et Telecommun., Univ. de Nice-Sophia Antipolis, Valbonne, France
Abstract :
A single-layer reflector antenna combining eight and four correcting Fresnel zones is presented. The progressive phase shift is achieved by circular and annular patches. The choice of a quarter-wavelength thickness substrate provides naturally 0 and 180° correcting zones that simplify the reflector design. A prototype of reflector antenna working at 94 GHz has been designed, built and measured. Measurement results show 70% improvement of antenna aperture efficiency compared to the half-wave Fresnel zone plate reflector.
Keywords :
aperture antennas; helicopters; reflector antennas; zone plates; 94 GHz; annular patch; antenna aperture efficiency; half wave Fresnel zone plate reflector; helicopter collision avoidance; progressive phase shift; prototype; quarter wavelength thickness substrate; single layer reflector antenna; zonal ring reflector;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20046465
