DocumentCode :
2637977
Title :
The elliptical Fresnel-zone plate antenna
Author :
van Houten, J.M. ; Herben, M.H.A.J.
Author_Institution :
Eindhoven Univ. of Technol., Netherlands
fYear :
1995
fDate :
4-7 Apr 1995
Firstpage :
97
Abstract :
The growing number of direct broadcast satellites (DBS) asks for simple, low-cost home receiving systems. The use of the Fresnel-zone plate antenna (FZPA), which is related to the optical lens, is also promising for this application. The aperture of the FZPA is plane and its structure is determined by the well-known Fresnel ellipsoids. In a practical situation the Fresnel zones are often attached to a window of a building. Then, the line between satellite and receiver is not perpendicular to the aperture and, consequently, the rings become elliptical. In the paper this elliptical FZPA is analysed for both linear and circular polarization. The latter is included because most of the future DBS will transmit circularly polarized waves. For this particular polarization a squint of the antenna beam is expected, because of the asymmetric antenna geometry. Kirchhoff´s diffraction theory is used to calculate the mainlobe, the first sidelobe and the corresponding crosspolar lobes of elliptical FZPAs with absorbing rings
Keywords :
Fresnel diffraction; antenna radiation patterns; direct broadcasting by satellite; electromagnetic wave diffraction; electromagnetic wave polarisation; receiving antennas; reflector antennas; satellite antennas; zone plates; DBS; Fresnel ellipsoids; Kirchhoff´s diffraction theory; absorbing rings; antenna beam squint; asymmetric antenna geometry; circular polarization; crosspolar lobes; direct broadcast satellites; elliptical Fresnel-zone plate antenna; linear polarization; low-cost home receiving systems; mainlobe; receiver; reflector antenna; sidelobe;
fLanguage :
English
Publisher :
iet
Conference_Titel :
Antennas and Propagation, 1995., Ninth International Conference on (Conf. Publ. No. 407)
Conference_Location :
Eindhoven
Print_ISBN :
0-85296-637-7
Type :
conf
DOI :
10.1049/cp:19950268
Filename :
396202
Link To Document :
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