Ray-Tracing Model for Generalized Geodesic-Lens Multiple-Beam Antennas

Liao, QingbiEricsson AB, Filter & Antenna Syst, S-16483 Stockholm, Sweden. (författare)

QC 20230508
Geodesic lenses are a compelling alternative to traditional planar dielectric lens antennas, as they are low loss and can be manufactured with a simple mechanical design. However, a general approach for the design and analysis of more advanced geodesic-lens antennas has been elusive, limiting the available tools to rotationally symmetric surfaces. In this article, we present a fast and efficient implementation built on geometrical optics and scalar diffraction theory. A numerical calculation of the shortest ray path (geodesic) using an open-source library helps quantify the phase of the electric field in the lens aperture, while the amplitude is evaluated by applying ray-tube power conservation theory. The Kirchhoff-Fresnel diffraction formula is then employed to compute the far field of the lens antenna. This approach is validated by comparing the radiation patterns of a transversely compressed geodesic Luneburg lens (elliptical base instead of circular) with the ones computed using commercial full-wave simulators, demonstrating a substantial reduction in computational resources. The proposed method is then used in combination with an optimization procedure to study possible compact alternatives of the geodesic Luneburg lens with size reduction in both the transverse and vertical directions.

Fonseca, Nelson J. G.European Space Agcy, Antennas & Submillimeter Waves Sect, NL-2200 AG Noordwijk, Netherlands. (författare)
Camacho, MiguelUniv Seville, Sch Phys, Dept Elect & Electromagnetism, Seville 41012, Spain. (författare)
Palomares-Caballero, AngelUniv Granada UGR, Dept Signal Theory Telemat & Commun, Granada 18071, Spain. (författare)
Mesa, FranciscoUniv Seville, Dept Appl Phys 1, ETS Ingn Informat, Seville 41012, Spain. (författare)
Quevedo-Teruel, OscarKTH,Elektroteknisk teori och konstruktion(Swepub:kth)u16a6hjt (författare)
Ericsson AB, Filter & Antenna Syst, S-16483 Stockholm, Sweden.European Space Agcy, Antennas & Submillimeter Waves Sect, NL-2200 AG Noordwijk, Netherlands. (creator_code:org_t)

Ingår i:IEEE Transactions on Antennas and Propagation: Institute of Electrical and Electronics Engineers (IEEE)71:3, s. 2640-26510018-926X1558-2221

Av författaren/redakt...: Liao, Qingbi; Fonseca, Nelson ...; Camacho, Miguel; Palomares-Caball ...; Mesa, Francisco; Quevedo-Teruel, ...

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