Journal ArticleDOI
Definition of artificially soft and hard surfaces for electromagnetic waves
TLDR
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.Abstract:
The widely used transversely corrugated surfaces and other alternative surfaces having the same anisotropic surface impedance deserve a common name. Here it is proposed to call them soft surfaces by analogy with the soft surfaces in acoustics. In the same way artificially hard surfaces are defined. Cylindrical hard waveguides of any cross-sectional shape can support TEM waves.read more
Citations
More filters
Journal ArticleDOI
Reflection phase characterizations of the EBG ground plane for low profile wire antenna applications
Fan Yang,Yahya Rahmat-Samii +1 more
TL;DR: In this article, the authors focus on the reflection phase feature of EBG surfaces, which can be used to identify the input-match frequency band inside of which a low profile wire antenna exhibits a good return loss.
Journal ArticleDOI
Local Metamaterial-Based Waveguides in Gaps Between Parallel Metal Plates
TL;DR: 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.
Journal ArticleDOI
Artificially soft and hard surfaces in electromagnetics
TL;DR: In this paper, the concept of soft and hard surfaces is treated in detail, considering different geometries, and it is shown that both the hard and soft boundaries have the advantage of a polarizationindependent reflection coefficient for geometrical optics ray fields, so that a circularly polarized wave is circularly polarization in the same sense after reflection.
Journal ArticleDOI
Full-Wave Invisibility of Active Devices at All Frequencies
TL;DR: In this paper, the authors studied the behavior of finite energy solutions of the Helmholtz and Maxwell's equations for singular electromagnetic parameters, and studied the behaviour of the solutions on the entire domain, including the cloaked region and its boundary.
Journal ArticleDOI
Cloaking Devices, Electromagnetic Wormholes, and Transformation Optics
TL;DR: Recent theoretical and experimental progress on making objects invisible to detection by electromagnetic waves is described and ideas for devices that would once have seemed fanciful may now be at least approximately implemented physically using a new class of artificially structured materials called metamaterials.
References
More filters
Journal ArticleDOI
A method of synthesizing radiation patterns with axial symmetry
H.C. Minnett,B. Thomas +1 more
TL;DR: Symmetrical radiation feed patterns which are consequence of specified form of hybrid mode fields as disclosed by focal plane analysis are described in this article, where the authors show that the feed pattern is a consequence of the hybrid mode field.
Journal ArticleDOI
Horn antennas with uniform power patterns around their axes
TL;DR: In this article, it was shown that a linearly polarized horn that has the same power pattern in all planes through the axis can be made from a synthetic material for which the boundary conditions on E and H are the same.
Journal ArticleDOI
The hat feed: A dual-mode rear-radiating waveguide antenna having low cross polarization
TL;DR: In this article, an analytical model for the radiation pattern of the hat antenna, a model which includes the axial waveguide itself, is presented, showing that by exciting the feed with two modes it is possible to use the waveguide constructively as one of the dominant radiating parts of the feed instead of having to live with it as an undesirable blockage effect.
Propagation and radiation behaviour of a longitudinally slotted horn with dielectric-filled slots
M.S. Aly,S.F. Mahmoud +1 more
TL;DR: In this article, the slots of a longitudinally slotted horn were filled with a dielectric material, which considerably reduced the required slot depths for achieving low crosspolarisation; thus more feasible and economic design of such a horn is possible.
Related Papers (5)
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