Modelling of a geodesic lens antennas using a raytracing model
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Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/369638
Tipus de documentText en actes de congrés
Data publicació2022
EditorUniversitat Politècnica de Catalunya. Remote Sensing, Antennas, Microwaves and Superconductivity Group (CommSensLab)
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Reconeixement-NoComercial-SenseObraDerivada 4.0 Internacional
Abstract
In order to meet the demands of low latency and high data rates, mobile networks are migrating to
higher frequency bands. With increased frequency, both path and material losses increase as well
creating a need for low loss and highly directive antennas. Fully metallic lens antennas offer an
interesting solution to this problem. Lens antennas can provide a highly directive beam that can be
steered using electronic switching, avoiding complex beam steering methods such as mechanical
steering or phased arrays. Additionally, the fully metallic implementation of lenses mitigates
material losses since no dielectric materials are needed. One possible way of realizing fully
metallic lenses is by taking advantage of geodesic surfaces. These surfaces can mimic the refractive
index of gradient-index dielectric lenses such as the Luneburg lens or the Maxwell-Fish Eye lens
[M. Šabort & T. Tyc, “Spherical media and geodesic lenses in geometrical optics,” J. Opt., 2013].
Modeling these lenses in commercial full-wave simulation software is however time-consuming
since lenses are typically large in terms of wavelength. It is, therefore, impractical to design such a
lens using these simulation tools, especially if the lens is to be optimized for a certain performance,
e.g. side-lobe levels or a desired beamwidth. A procedure that is efficient in terms of computational
time while being sufficiently accurate is provided by the ray tracing technique. This technique has
been widely used to study gradient-index dielectric lenses and is here applied to also deal with
geodesic metallic lenses [R. F. Rinehart, “A family of designs for rapid scanning radar antennas,”
Proc. IRE, vol. 40, no. 6, pp. 686–688, 1952].
A possible disadvantage of the design of lens antennas using geodesic surfaces, compared to e.g.
metasurfaces, is the increased profile of the lens since the direction orthogonal to the beamforming
plane is employed to generate the geodesic surface. A solution to this problem was long ago
addressed in [K. S. Kunz, “Propagation of microwaves between a parallel pair of doubly curved
conducting surfaces,” J. Appl. Phys., vol. 25, no. 5, pp. 642–653, 1954]. This author proposed to
fold the geodesic surface so that the height profile was reduced without affecting the performance
of the lens. Moreover, this folding can be applied any number of times to achieve the required
compression. An important practical drawback caused by these foldings is the appearance of slope
discontinuities at the folding locations. The profile in these regions should then be “smoothed” and,
in doing so, the geodesic surface is being changed with the undesired risk of a degraded
performance of the lens. To maintain the required performance of the lens, the profile used at the
folding locations has to be optimized, but this task is rather impractical if carried out by means of
full-wave commercial simulators. The raytracing technique is here a perfect candidate for a more
efficient modeling. In summary, in this presentation a raytracing code will be presented capable of
an efficient modeling a folded geodesic lens antennas. The results obtained by the code are then
compared to results achieved by full-wave simulation software.
CitacióVidarsson, F.V.; Mesa, F.; Quevedo-Teruel, O. Modelling of a geodesic lens antennas using a raytracing model. A: EIEC 2022. "XIV Iberian Meeting on Computational Electromagnetics". Universitat Politècnica de Catalunya. Remote Sensing, Antennas, Microwaves and Superconductivity Group (CommSensLab), 2022,
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EIEC_2022_10_Modelling of a Geodesic Lens.pdf | 79,79Kb | Visualitza/Obre |