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Dual-reflector antennas have been investigated for omnidirectional coverage, where the reflector surfaces are bodies of revolution obtained by spinning confocal conic sections or shaped generating curves about a common symmetry axis. The aim of this work is to complement the previous investigations by deriving the GO aperture held of omnidirectional axis-displaced dual-reflector antennas with an arbitrary...
The purpose of this analysis is to determine the radiation pattern of a monopole antenna placed at the bottom of a Dual Parabolic Reflector with a circular opening on the top. The resultant image of the full dipole should thus appear to float above the opening of the Dual Sphere while the monopole element is actually hidden at the bottom. This configuration may prove useful in conformal antennas and...
This paper presents a technique for restoring the inherent axial ratio without a reduction in the radiation efficiency. For this purpose, an EBG reflector [2][3] is adopted and modified. The EA-spiral with the EBG reflector is analyzed using the finite-difference time-domain method and the radiation characteristics are revealed.
In this paper, we design a wideband RF pulse generator. Fig. 1 shows a schematic diagram of the RF pulse generator. It is comprised of a high-voltage charging system, a spark-gap switch, and a fat dipole antenna. Since the antenna and the spark gap switch are united, the source may be compact and robust. Marx generator is used as high-voltage charging system. The spark gap switch is located at the...
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