Journal ArticleDOI
Theory of dielectric-filled edge-slot antennas
TLDR
In this article, a theory for dielectric-filled edge-slot (DFES) antennas is developed for conformal mounting on conducting bodies of revolution (BOMs).Abstract:
A theory has been developed for dielectric-filled edge-slot (DFES) antennas which belong to a class of circumferential slot antennas that are suitable for conformal mounting on conducting bodies of revolution. The specific antenna considered consists of a disk of dielectric substrate mounted between the two halves of a conducting cylinder and is excited at its center by a coaxial stub. It can be tuned for a desired operating frequency with the help of a number of axially oriented passive metallic posts located inside the dielectric region. For analysis, the antenna is modeled as a symmetrically excited E -type radial waveguide loaded with the metallic posts and terminated by an equivalent admittance appropriate for the radiating aperture. Circuit parameters for the metallic posts in the radial waveguide are obtained by detailed field analysis using mode matchng techniques. These are then used, along with the equivalent transmission line circuit for the antenna, to obtain the input reflection coefficient as a function of frequency for various DFES antennas. The results of computations based on the theory developed are compared with available measured values.read more
Citations
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Journal ArticleDOI
On the Dual-Band DRA-Slot Hybrid Antenna
Yong Ding,Kwok Wa Leung +1 more
TL;DR: In this paper, a hybrid dual-band antenna is proposed for IEEE 802.11a/b WLAN applications, where a dielectric resonator antenna (DRA) is placed on top of a slotted cavity.
Journal ArticleDOI
Radial-line/coaxial-line junctions: analysis and equivalent circuits
TL;DR: In this paper, an exact analysis of a radial-line/coaxial-line junction is presented, where an equivalent is deduced for the junction for the case where only the dominant modes can propagate in the radial and coaxial lines.
Journal ArticleDOI
Equivalent circuit for radial-line/coaxial-line junction
TL;DR: In this article, a simple equivalent circuit for a commonly encountered radial-line/coaxial-line junction was presented for the case where the dominant modes in the respective lines are the only propagating modes.
Journal ArticleDOI
Transmission Line Model Analysis of Rectangular Patch Antennas
TL;DR: In this article, the transmisson line model has been used to determine the input performance of a rectangular patch antenna excited by a coaxial probe, and the results of computations based on the expressions developed are compared with available measured values.
Journal ArticleDOI
Design and Prototyping of a Switching Beam Disc Antenna for Wideband Communications
TL;DR: The design procedure for a switching beam antenna for wireless communication systems is given, which can rotate the beam over the whole azimuthal angle exploiting its geometrical and electrical cylindrical symmetry.
References
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Journal ArticleDOI
An omnidirectional microwave antenna for use on spacecraft
W. Croswell,C. Cockrell +1 more
TL;DR: In this article, the qualitative theory, design, and development of a parallel-plate waveguide-fed antenna, suitable for flush-mounted broad-band spacecraft applications, are presented, making use of wedge-like metal posts placed uniformly about the periphery of the feed plates to provide both structural strength and practical interconnection routes for cables without disrupting the antenna impedance and patterns.
Journal ArticleDOI
Conformal dielectric-filled edge-slot antennas with inductive-post tuning
TL;DR: The edge-slot antenna as discussed by the authors is a class of circumferential-slot antennas that is ideally suited for conformal mounting on conducting bodies of revolution (BoV) and has a single coaxial stub at the center.
Journal ArticleDOI
Radiation characteristics of a cavity-backed cylindrical gap antenna
C. Swift,T. Campbell,H. Hodara +2 more
TL;DR: In this article, the input impedance and the equatorial radiation patterns of a VHF cavity-backed cylindrical gap antenna are derived and compared with experiments, provided that the gap dimension is neither larger than about 1/100 of a wavelength, nor so thin that mechanical tolerances in the feed design become important.
Proceedings ArticleDOI
Input reflection coefficient of a basic dielectric-filled edge-slot antenna
TL;DR: In this paper, a theory for the inpurt reflection coeffecieint as a function of frequency for a basic Dlelectric-Filled Edge-slot (DFES) antenna was developed.