Journal ArticleDOI
An Absorber-Wall Parallel-Plate Waveguide
TLDR
In this paper, the authors investigated the electromagnetic field propagation through a parallel-plate waveguide having absorber walls, and showed that the dominant TM/sup e/sub 10/ and TE/sup E/sub sub 10/ modes can propagate independently with both having a highly-tapered (cosine-type) transverse distribution, phase velocity slightly exceeding the speed of light, and very low axial attenuation, especially for a wall-spacing large as compared to a free-space wavelength.Abstract:
The electromagnetic fields that can propagate through a parallel-plate waveguide having absorber walls are investigated, and it is shown that dominant TM/sup e//sub 10/ and TE/sup e//sub 10/ modes can propagate independently with both having a highly-tapered (cosine-type) transverse distribution, a phase velocity slightly exceeding the speed of light, and very low axial attenuation, especially for a wall-spacing large as compared to a free-space wavelength. In other words, such an absorber-guide acts life a corrugated waveguide having "lambda/4" teeth (balanced-hybrid mode) but it does so over virtually an unlimited bandwidth and with little sensitivity to the absorber's characteristics.read more
Citations
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Journal ArticleDOI
Trends in radar absorbing materials technology
K. J. Vinoy,R M Jha +1 more
TL;DR: In this paper, the underlying principles of electromagnetic analysis and design, fabrication and the trends in RAMs reviewed in this paper could lead to indigenisation, and even pioneering next generation of RAM technology.
Journal ArticleDOI
Radiation from a rectangular waveguide with a lossy flange
Kuniaki Yoshitomi,H.R. Sharobim +1 more
TL;DR: In this article, a rectangular waveguide with a lossy flange coating is studied both analytically and experimentally and an analytic method using Fourier analysis and an impedance boundary condition is proposed.
Journal ArticleDOI
Coupling modeling and reduction techniques of cavity-backed slot antennas: FDTD versus measurements
TL;DR: In this article, the finite-difference time-domain (FDTD) method is used to analyze different antenna characteristics of such elements including input impedance, coupling, and radiation patterns.
Journal ArticleDOI
On the fields in a conical horn having an arbitrary wall impedance
TL;DR: In this article, the electromagnetic field propagating up a cone having an arbitrary wall impedance is found using an asymptotic solution, and three special cases are considered: the smooth metal wall, the corrugated wall, and the metal wall with a lossy-dielectric lining.
Journal ArticleDOI
Contour path FDTD method for analysis of pyramidal horns with composite inner E-plane walls
TL;DR: In this article, the contour path finite-difference time-domain (FDTD) method is used for modeling pyramidal horn antennas with or without composite E-plane inner walls.
References
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Journal ArticleDOI
Attenuation and Radiation Characteristics of the HE /Sub 11/ - Mode
TL;DR: In this article, the asymptotic properties of the fundamental mode HE/sub 11/ inside a large waveguide of finite surface impedances are discussed and the analysis applies to corrugated waveguides, certain optical fibers and wave-guides with metal walls coated by a dielectric layer.
Journal ArticleDOI
Low-loss modes in dielectric lined waveguide
J. W. Carlin,P. D'Agostino +1 more
TL;DR: In this article, it was shown that the lowest loss modes are alternately circular electric and circular magnetic as frequency (or lining thickness) increases, with low loss occurring at frequencies and lining thickness where the wall impedance of the dielectric coated guide approximates a short circuit for circular electric modes, and an open circuit (or magnetic wall) for circular magnetic modes.
Proceedings ArticleDOI
A simple version of corrugated waveguide: Smooth-walled circular waveguide coated with lossy magnetic material
C. S. Lee,S. Chuang,Shung-Wu Lee +2 more
Journal ArticleDOI
A relation for the loss characteristics of circular electric and magnetic modes in dielectric lined waveguide
TL;DR: In this paper, the authors derived a simple relationship between the loss characteristics of circular electric waves with 0, λ/2, · · · thick linings and circular magnetic waves with λ /4, 3λ/4, · ǫ · · thin linings, and showed that the minimum obtainable circular magnetic mode loss is at least four times greater than the minimum obtainingable circular electric mode loss.
Journal ArticleDOI
Low-attenuation characteristics of dielectric-lined waveguide
TL;DR: In this article, a low attenuation characteristic of the EH11 mode in dielectric-lined circular waveguide is explained in a manner similar to that reported by Carlin and D'Agostino for TM 0m modes.