Title :
Shadow blockage improvement using a perforated dielectric Fresnel lens
Author :
Petosa, A. ; Ittipiboon, A. ; Thirakoune, S.
Author_Institution :
Commun. Res. Centre Canada, Ottawa, Ont., Canada
Abstract :
Shadow blockage can lead to a significant reduction in the efficiency of grooved dielectric Fresnel lenses, especially for small values of F/D. This paper presents a multi-dielectric Fresnel lens which does not suffer from the effects of shadow blockage The lens is fabricated from a single dielectric sheet where perforations in the material are used to obtain the required dielectric constants. Measurements carried out at 30.5 GHz show nearly 1 dB gain improvement of the perforated dielectric Fresnel lens over a corresponding grooved lens.
Keywords :
Fresnel diffraction; antenna radiation patterns; lens antennas; permittivity; 30.5 GHz; dielectric constants; grooved lenses; lens efficiency; material perforations; multi-dielectric lens; perforated dielectric Fresnel lens; radiation patterns; shadow blockage improvement; spurious diffraction; Costs; Dielectric constant; Dielectric materials; Dielectric measurements; Fresnel reflection; Gain measurement; Lenses; Optical design; Optical materials; Slabs;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2003. IEEE
Conference_Location :
Columbus, OH, USA
Print_ISBN :
0-7803-7846-6
DOI :
10.1109/APS.2003.1220323
