Results 11 to 20 of about 632 (194)
Curvilinear Fresnel-Zone Plate Lens Antenna: Vector Radiation Theory
International Journal of Infrared and Millimeter Waves, 2005 A generalized vector diffraction theory of the half-open curvilinear Fresnel zone plate (FZP) tens antenna that is valid for any lens profile shape is presented. It is an extension to the vector Kirchhoff diffraction theory for the plane half-open FZP lens antenna and is based on the conical-segment lens profile approximation.
L. P. Kamburov +3 more
openalex +5 more sources
Naked eye direction of arrival estimation with a Fresnel lens [PDF]
Scientific Reports, 2022 Direction of arrival (DoA) estimation is of primary importance in a broad range of wireless applications, where electromagnetic waves play a role. While a vast majority of existing techniques is based on phase lag comparison in antenna arrays, intensity ...
Dmytro Vovchuk +3 more
doaj +2 more sources
Analysis and Evaluation of Fresnel Zone Antenna Designs
Journal of Zankoy Sulaimani - Part A, 2010 This paper presents an analysis and evaluation of two designs of flat aperture antenna based on Huygen's principle and Fresnel diffraction theory ; therefore, this antenna type is called Fresnel zone plate antenna. The two designs include Soret and Wood types which are different in shape, design procedure and the manufacturing techniques; thus in ...
Asaad M. Jassim Al-Hindawi +1 more
openalex +2 more sources
Millimeter-wave Fresnel-zone plate lens and antenna
Microwave and Optical Technology Letters, 1995 AbstractA novel reflector‐backed Fresnel zone plate antenna (FZPA) is presented. The reflector is positioned at the aperture of the feed antenna such that the radiation that was reflected back off the metal zones of the FZPA gets reradiated instead of being lost.
H.D. Hristov, M.H.A.J. Herben
+5 more sources
Investigation of planar fresnel zone plate antennas [PDF]
, 2008 Sara Stout-Grandy
openalex +3 more sources
Electromagnetic analysis of the Fresnel zone plate lens antenna
, 1991 The Fresnel zone plate has a very long history as an optical lens and promising characteristics as a microwave antenna. Experimental investigations of its radiation properties have demonstrated a narrow main beam and low sidelobes. Previous analyses have been entirely in terms of scalar diffraction theory.
Patrick O’Brien +2 more
openalex +2 more sources
Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2020 The feasibility of beam-shaping of a Ku-Band horn as a transmitting (Tx) antenna by mounting two different versions of lenses which are kind of Fresnel Zone Plates (FZP) is studied.
Ahmet Teber
doaj +1 more source
Scientific Reports, 2022 A new integrated lens-antenna is designed and implemented for a nanocontact based terahertz (THz) photomixer. The new design replaces the standard conventional bulky silicon lens, which normally no THz photomixer can avoid. The Fresnel Zone Plate is used
Shihab Al-Daffaie +3 more
doaj +1 more source
Радіоелектронні і комп'ютерні системи, 2021 The paper presents a mathematical model of radio-electronic systems (RES), which include antennas and their excitation paths with nonlinear characteristics.
Дмитро Вячеславович Грецьких +4 more
doaj +1 more source
Journal of Marine Science and Engineering, 2023 The maritime land–sea communication channel experiences multipath shadowing and fading due to ships, onshore and offshore structures, and reflections from the sea surface. When using low altitude antennas, the sea surface itself can block the propagation
Leopoldo Gómez, Ahmed S. Ibrahim
doaj +1 more source