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Journal ArticleDOI

Corrugated conical horn as a space feed for phased-array illumination

01 Sep 1974-IEEE Transactions on Antennas and Propagation (IEEE)-Vol. 22, Iss: 5, pp 720-722
TL;DR: In this article, the importance of corrugated conical horns in space-fed illumination of phased arrays is indicated, and design details pertaining to corrugation of conical horn of optimum proportions for uniform illumination of a phased array with a prescribed area are presented.
Abstract: The importance of corrugated conical horns in space-fed illumination of phased arrays is indicated. Design details pertaining to corrugated conical horns of optimum proportions for uniform illumination of a phased array with a prescribed area are also presented.
Citations
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Journal ArticleDOI
TL;DR: In this paper, an experimental coherent pulsed radar operating at 225 GHz was described, where a quasi-optical circular polarization duplexer combines transmitter and receiver signals into the same antenna.
Abstract: An experimental coherent pulsed radar operating at 225 GHz is described. The system uses a pulsed, phase-locked extended interaction oscillator transmitter and frequency divided by 4 subharmonic mixer pumped by a phase-locked Gunn oscillator as the receiver. A quasi-optical circular polarization duplexer combines transmitter and receiver signals into the same antenna. Results presented include the detection of targets out to ranges of 3.5 km and observations of Doppler spectra of trucks and tracked vehicles which show contributions from both body and tracks. >

66 citations

Journal ArticleDOI
TL;DR: In this paper, a class of circular magnetic hybrid-mode (MHM) horns were designed for the corrugated horn with an ohmic loss of 0.8 to 2.7 dB and it appears feasible to reduce the gain loss to less than 1 dB.
Abstract: Design techniques are presented for a class of circular magnetic hybrid-mode (MHM) horns together with experimental results. In comparison with earlier techniques, this design method is simpler and more amenable to physical interpretation. The horns designed exhibit performance comparable to that of the corrugated horn except that they have an ohmic loss of 0.8 to 2.7 dB. However, it appears feasible to reduce the gain loss to less than 1 dB. >

5 citations

01 Jan 1992

4 citations

Journal ArticleDOI
TL;DR: The results of the analytical and experimental study of the propagation and radiation behavior of dielectric-coated conical horns with small flare angles are reported in this article, where the analysis of the fields in such a horn is made using spherical hybrid modes.
Abstract: The results of the analytical and experimental study of the propagation and radiation behaviour of dielectric-coated conical horns with small flare angles are reported. The analysis of the fields in such a horn is made using spherical hybrid modes. The characteristic equation for the separation constant is obtained. The radiation characteristics are derived using vector diffraction formula with the assumption of no phase variation over the aperture of small-angle cones. Analytical results are in good agreement with experimental results. Axial directivity and beamwidth of conical horns have been found to improve due to dielectric coating.

2 citations

References
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Journal ArticleDOI
01 Sep 1971
TL;DR: In this article, a theoretical and experimental investigation of the radiation behavior of conical corrugated horns is described and the horn-aperture field is determined using spherical-mode analysis, and the radiation pattern is obtained by two methods.
Abstract: A theoretical and experimental investigation of the radiation behaviour of conical corrugated horns is described. The horn-aperture field is determined using spherical-mode analysis, and the radiation pattern is obtained by two methods, one of which employs a Kirchhoff-Huygen integration over a constant-phase surface at the mouth of the horn, and the other of which employs an expansion of the aperture field in terms of TE and TM spherical modes of freespace. Excellent agreement is obtained between the two methods and with experimental results. A theoretical investigation is reported of the use of lenses to correct the phase of a conical corrugated horn. Finally, the performance of paraboloid antennas using corrugated horns as feeds is briefly discussed.

23 citations

Journal ArticleDOI
TL;DR: In this article, the diffracted far field of a wide-flare-angle corrugated conical horn (operating on the HE11 mode) has been obtained making use of a simpler expression for the aperture field.
Abstract: Expressions for the diffracted far field of a wide-flare-angle corrugated conical horn (operating on the HE11 mode) have been obtained making use of a simpler expression for the aperture field. Expressions for the radiation pattern and gain reduce to a closed form when the flare (semivertical) angle is less than 30°. The theoretical results are in close agreement with experiment.

13 citations