Journal ArticleDOI
Local Metamaterial-Based Waveguides in Gaps Between Parallel Metal Plates
TLDR
The ridge gap waveguide as mentioned in this paper is a metamaterial-based waveguide that can be realized in a narrow gap between two parallel metal plates by using a texture or multilayer structure on one of the surfaces.Abstract:
This letter presents a new metamaterial-based waveguide technology referred to as ridge gap waveguides. The main advantages of the ridge gap waveguides compared to hollow waveguides are that they are planar and much cheaper to manufacture, in particular at high frequencies such as for millimeter and sub- millimeter waves. The latter is due to the fact that there are no mechanical joints across which electric currents must float. The gap waveguides have lower losses than microstrip lines, and they are completely shielded by metal so no additional packaging is needed, in contrast to the severe packaging problems associated with microstrip circuits. The gap waveguides are realized in a narrow gap between two parallel metal plates by using a texture or multilayer structure on one of the surfaces. The waves follow metal ridges in the textured surface. All wave propagation in other directions is prohibited (in cutoff) by realizing a high surface impedance (ideally a perfect magnetic conductor) in the textured surface at both sides of all ridges. Thereby, cavity resonances do not appear either within the band of operation. The present letter introduces the gap waveguide and presents some initial simulated results.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.
Journal ArticleDOI
Numerical studies of bandwidth of parallel-plate cut-off realised by a bed of nails, corrugations and mushroom-type electromagnetic bandgap for use in gap waveguides
TL;DR: In this paper, the bandwidth of gap waveguide is determined by the cut-off bandwidth of a parallel-plate waveguide where one surface has such a texture and no ridges or strips.
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 ArticleDOI
Parallel Plate Cavity Mode Suppression in Microstrip Circuit Packages Using a Lid of Nails
TL;DR: In this article, a textured metal lid consisting of periodically located pins known as a bed of nails is employed for the suppression of parallel plate and cavity modes in shielded microstrip circuits, which has a bandwidth of more than 2:1 and does not interfere much with the microstrip circuit.
Journal ArticleDOI
Wide-Band Slot Antenna Arrays With Single-Layer Corporate-Feed Network in Ridge Gap Waveguide Technology
Ashraf Uz Zaman,Per-Simon Kildal +1 more
TL;DR: In this paper, a single-layer, wideband, and low-loss corporate-feed networks for slot antenna arrays are described, where the antenna is built using ridge gap waveguide technology, formed between two parallel metal plates.
References
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Journal ArticleDOI
High-impedance electromagnetic surfaces with a forbidden frequency band
TL;DR: In this paper, a new type of metallic structure has been developed that is characterized by having high surface impedance, which is analogous to a corrugated metal surface in which the corrugations have been folded up into lumped-circuit elements and distributed in a two-dimensional lattice.
Journal ArticleDOI
Single-layer feed waveguide consisting of posts for plane TEM wave excitation in parallel plates
Jiro Hirokawa,Makoto Ando +1 more
TL;DR: In this article, a novel feed structure was proposed to excite a plane TEM wave in a parallel-plate waveguide, which is composed of densely arrayed posts on the same layer as the parallel plate.
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
Electromagnetic Characterization of Textured Surfaces Formed by Metallic Pins
TL;DR: In this article, a homogenization model was developed to characterize textured surfaces formed by a periodic arrangement of thin metallic pins attached to a conducting ground plane: the ldquoFakir's bed of nailsrdquo substrate.
Journal ArticleDOI
Periodic analysis of a 2-D negative refractive index transmission line structure
TL;DR: In this article, the propagation characteristics of a two-dimensional (2D) negative refractive index (NRI) transmission line (TL) structure are explained using Bloch theory.