GTD analysis of the radiation patterns of conical horns
TL;DR: In this article, far-field radiation patterns of conical horns of arbitrary flare angles excited in the TE-11 mode were obtained employing the geometric theory of diffraction (GTD) based on the theory of Kouyoumjian and Pathak and the slope diffraction technique.
Abstract: The far-field radiation patterns of conical horns of arbitrary flare angles excited in the TE_{11} mode are obtained employing the geometric theory of diffraction (GTD) based on the theory of Kouyoumjian and Pathak [3] and the slope diffraction technique [4]. The analysis presented enables one to predict accurately radiation patterns over the main beam, near and far sidelobes, and the becklobe of the horn. Validity of the analysis is established by satisfactory agreement between the calculated and measured patterns of an experimental conical horn. The radiation patterns of wide-flare corrugated conical horns excited in the HE_{11} mode of operation have also been calculated over the main beam, which contains most of the radiated energy (up to -40 dB with respect to boresight field), employing slope diffraction technique, and a good agreement is noticed between the calculated and measured radiation patterns.
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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.
Abstract: The electromagnetic fields propagating up a cone having an arbitrary wall impedance are found using an asymptotic solution. Three special cases are then considered: the smooth-metal wall, the corrugated wall, and the metal wall with a lossy-dielectric lining. The last case, in the form of an absorber-lining is then shown to behave like a corrugated horn since it too provides a highly tapered E -plane and H -plane aperture distribution. Furthermore, it does this over a much larger bandwidth, over 3:1, with negligible gain drop.
23Â citations
TL;DR: In this article, the impact of flnite ground plane edge difiractions on the amplitude patterns of aperture antennas is examined, using the Uniform Theory of Difiraction (UTD) and the Geometrical Optics (GO) methods.
Abstract: In this study, the impact of flnite ground plane edge difiractions on the amplitude patterns of aperture antennas is examined. The Uniform Theory of Difiraction (UTD) and the Geometrical Optics (GO) methods are utilized to calculate the amplitude patterns of a conical horn, and rectangular and circular waveguide apertures mounted on square and circular flnite ground planes. The electric fleld distribution over the antenna aperture is obtained by a modal method, and then it is employed to calculate the geometrical optics fleld using the aperture integration method. The UTD is then applied to evaluate the difiraction from the ground planes' edges. Far-zone amplitude patterns in the E and H planes are flnally obtained by the vectorial summation of the GO and UTD flelds. In this paper, to accurately predict the H-plane amplitude patterns of circular and rectangular apertures mounted on square ground planes, the E-plane edge difiractions need to be included because the E-plane edge difiractions are much more intense than those of the H-plane edge regular and slope difiractions. Validity of the analysis is established by satisfactory agreement between the predicted and measured data and those simulated by Ansoft's High Frequency Structure Simulator (HFSS). Good agreement is observed for all cases considered.
10Â citations
TL;DR: Two simulation techniques for modeling periodic structures with three-dimensional elements in general are presented, one based on the Method of Moments (MoM) and the other a Finite Difierence Time Domain (FDTD)-based approach, which is well suited for handling arbitrary, inhomogeneous, three- dimensional periodic structures.
Abstract: In this paper we present two simulation techniques for modeling periodic structures with three-dimensional elements in general. The flrst of these is based on the Method of Moments (MoM) and is suitable for thin-wire structures, which could be either PEC or plasmonic, e.g., nanowires at optical wavelengths. The second is a Finite Difierence Time Domain (FDTD)-based approach, which is well suited for handling arbitrary, inhomogeneous, three-dimensional periodic structures. Neither of the two approaches make use of the traditional Periodic Boundary Conditions (PBCs), and are free from the di-culties encountered in the application of the PBC, as for instance slowness in convergence (MoM) and instabilities (FDTD).
3Â citations
TL;DR: In this paper, an analytical procedure for predicting accurately the E-plane patterns of conical horns with moderate aperture widths based on uniform geometrical theory of diffraction (UGTD) and supported by measured data is presented.
Abstract: An analytical procedure for predicting accurately the E -plane patterns of conical horns with moderate aperture widths ( ka ), based on uniform geometrical theory of diffraction (UGTD) and supported by measured data, is presented. This analysis predicts the E -plane patterns more accurately (over the main beam) than the one presented earlier.
2Â citations
TL;DR: In this article, a double conical horn which consists of two coaxially arranged conical horns is analyzed by means of a mode-matching procedure, and it can be dimensioned to produce nearly identical radiation characteristics at two different frequencies.
Abstract: A double conical horn which consists of two coaxially arranged conical horns is analyzed by means of a mode-matching procedure. It can be dimensioned, to produce nearly identical radiation characteristics at two different frequencies. Therefore the double conical horn can serve as a feed of reflector antennas in order to double the transmission capacity of the antenna system. A design procedure for this feed is given