Journal ArticleDOI
Analysis of soft and hard strip-loaded horns using a circular cylindrical model
TLDR
Strip-loaded horn with transverse (soft) and longitudinal (hard) strips are analyzed theoretically in this article, based on a circular cylindrical and uniform waveguide model with a periodic strip structure.Abstract:
Strip-loaded horns with transverse (soft) and longitudinal (hard) strips are analyzed theoretically The method is based on a circular cylindrical and uniform waveguide model with a periodic strip structure The field is represented by an infinite series of space harmonics (Floquet modes) in the air-filled central region and in the dielectrically filled wall region The tangential field is forced to be continuous across the air-dielectric boundary The propagation constant and the total field (including the hybrid factor) can be determined by solving the resulting matrix equations The convergence of the solution has been accelerated by calculating the higher-order terms analytically It is shown that the soft-strip-loaded horn in principle exhibits the same electrical behavior as a corrugated horn The horn represents an interesting alternative to the corrugated horn in wide-band or dual-band applications, in particular for millimeter waves and for lightweight applications onboard satellites The hard-strip-loaded horn has potentially high gain and low cross polarization over a certain frequency range, dependent on the horn dimensions, thickness of the dielectric wall and on how strongly the stripline modes are being excited >read more
Citations
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Journal ArticleDOI
Design and experimental verification of ridge gap waveguide in bed of nails for parallel-plate mode suppression
Per-Simon Kildal,Ashraf Uz Zaman,Eva Rajo-Iglesias,Esperanza Alfonso,Alejandro Valero-Nogueira +4 more
TL;DR: In this paper, the ridge gap waveguide is used to verify the large bandwidth and low losses of the quasi-transverse electromagnetic (TEM) mode propagating along the guiding ridge.
Proceedings Article
Three metamaterial-based gap waveguides between parallel metal plates for mm/submm waves
TL;DR: In this article, the basic ideas of how local waveguides and transmission lines can be designed to propagate along desired paths in the air gap between two metal surfaces are presented, related to the performance of artificial magnetic conductors, EBG surfaces and soft and hard surfaces.
Journal Article
EM Modeling of surfaces with STOP or GO characteristics - artificial magnetic conductors and soft and hard surfaces
Per-Simon Kildal,Ahmed A. Kishk +1 more
TL;DR: In this article, the authors discuss and demonstrate the relation between electromagnetic bandgap surfaces (EBG) used to realize artificial magnetic conductors and the so-called soft and hard surfaces in electromagnetics, with respect to their STOP and GO characteristics for surface waves.
Journal ArticleDOI
Artificial magnetic conductors realised by frequency-selective surfaces on a grounded dielectric slab for antenna applications
TL;DR: In this article, the effect of a high-impedance surface on scattering and radiation characteristics of a low-profile antenna is investigated. Butt et al. proposed a printed slot FSS for design of a monopole antenna.
Journal ArticleDOI
Design of 3-dB Hybrid Coupler Based on RGW Technology
Shoukry I. Shams,Ahmed A. Kishk +1 more
TL;DR: A design procedure for the hybrid couplers for ridge gap waveguides that can be deployed for both the 5G mobile communication and the airborne radar applications and results are in excellent agreement.
References
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Book
Time-harmonic electromagnetic fields
TL;DR: In this paper, a revised version of the Revised edition of the book has been published, with a new introduction to the concept of plane wave functions and spherical wave functions, as well as a detailed discussion of the properties of these functions.
Book
Corrugated Horns for Microwave Antennas
P. J. B Clarricoats,A. D. Olver +1 more
TL;DR: In this article, the authors describe the theory and design of corrugated horns and scalar feeds for microwave reflector antennas and explain why hybrid mode feeds are ideal feeds for reflectors.
Journal ArticleDOI
Definition of artificially soft and hard surfaces for electromagnetic waves
TL;DR: The widely used transversely corrugated surfaces and other alternative surfaces having the same anisotropic surface impedance deserve a common name as discussed by the authors, and it is proposed to call them soft surfaces by analogy with the soft surfaces in acoustics.
Journal ArticleDOI
A dielectric hybrid mode antenna feed: A simple alternative to the corrugated horn
TL;DR: In this paper, a hybrid-mode horn antenna has been analyzed theoretically and experimentally, which consists of a conical metal horn with a dielectric core inside, separated from the metal wall by another layer with lower permittivity than for the core material.
Journal ArticleDOI
Soft and hard horn antennas
Erik Lier,Per-Simon Kildal +1 more
TL;DR: Horn antennas with soft and hard boundaries are analyzed and the dependency between the edge taper directivity, and sidelobes is calculated based on the solution to the spherical hybrid modes in a conical horn with arbitrary wall impedances.