A correction to the available radiation formula for E -plane sectoral horns
TL;DR: In this paper, a correction to the available radiation formula for E -plane sectoral horn has been proposed, which is shown to be in better agreement with the measured radiation patterns for several values of fiare-angles of the E-plane Sectoral horns.
Abstract: A correction to the available radiation formula [1] for E -plane sectoral horn has been proposed. Calculated radiation patterns based on the corrected formula, are shown to be in better agreement with the measured radiation patterns for several values of fiare-angles of the E -plane sectoral horns.
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01 Aug 1973
TL;DR: In this article, the radiation properties of wide-flare corrugated E-plane sectoral horns (10°deg, where α is the halfflare angle) excited in the HE_{11} mode with improved Eplane radiation patterns and suppressed side-lobe levels over a broad bandwidth is described.
Abstract: An analytical and experimental investigation of the radiation properties of wide-flare corrugated E -plane sectoral horns ( 10\deg , where \alpha_{0} is the half-flare angle) excited in the HE_{11} mode [1] with improved E -plane radiation patterns and suppressed side-lobe levels over a broad bandwidth is described in this paper. Given the flare length and half-flare angle of the horn, the far-field radiation pattern is determined by two methods, one of which involves aperture-field integrations based on vector diffraction formula 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 free-space cylindrical TE and TM wave functions. Good agreement is obtained between the two methods with measured radiation patterns for several values of \alpha_{0} . Given the flare lengthy variation of the on-axis gain with \alpha_{0} of the horn is analytically investigated, and the design procedure for determining optimum \alpha{0} , in order to obtain maximum on-axis gain, is also indicated. Furthermore, design and experimental studies on wide-flare horns under consideration are also summarized.
10 citations
01 Jan 2007
TL;DR: In this paper, the authors proposed a parallel semi-constrained feeder for an end-fed traveling wave slotted waveguide array antenna with an input geometry of piling up slotted rectangular waveguides.
Abstract: Linear phased array antenna such as end-fed traveling wave slotted waveguide array antenna has an input geometry of piling up slotted rectangular waveguides. In this feed geometry constrained feed or semi-constrained feed type can be used but not a space feeds. Most frequently used type of feeder for this type of antenna is a serial feeder using coupling slots in a waveguide. The required characteristics of a feeder are appropriate power distribution on the antenna aperture, low insertion loss and low return loss. Serial feeder has additional 0.5 dB insertion loss (about 10 % power consumption) at the terminated load because the serial feed usually adapts traveling-wave type slotted waveguide. In addition the serial feeder is not suitable for a monopulse feeder because it is impossible to achieve Hannan’s optimum monopulse pattern [1]. The proposed feeder in [2] can be categorized as parallel semi-constrained feed. However it has the concept of a space feed because the aperture distribution comes from the E-plane sectoral corrugated horn. In addition to E-plane sectoral corrugated horn, it is suggested in this paper that the aperture modulated waveguide ports make enhancement of aperture efficiency of the antenna system.
Dissertation•
01 Mar 1985
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TL;DR: In this article, the radiation characteristics of corrugated E-plane sectoral horns are studied and a separable modal solution of fields in terms of TE to z modes is obtained for this geometry.
Abstract: A study of the radiation characteristics of corrugated E -plane sectoral horns is described. Assuming the corrugations to be infinitely thin and sufficiently close packed, impedance boundary conditions are imposed on the fields in the axial region of the horn and it is established that a separable modal solution of fields in terms of TE to z modes is possible for this geometry. The horn aperture field is determined in terms of cylindrical wave functions and the vector diffraction formula is used to analyze the far-field radiation patterns. Excellent agreement is obtained between the theoretically derived pattern with experimental results for horns supporting the balanced HE_{11} mode with small flare angles ( 2_{\alpha 0} \leq 30\deg ), designed using the theory presented. Bandwidth properties of the horn have been studied which may be used to advantage in designing a corrugated E -plane sectoral horn without much degradation of its radiation characteristics corresponding to the balanced HE_{11} made over a wide frequency bandwidth (1.5:1).
27 citations