Journal ArticleDOI
Front-to-back ratio of paraboloidal reflectors
M. Narasimhan,K.R. Govind +1 more
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TLDR
In this paper, the authors used the field correlation theorem to determine the power coupled by a prime focus feed associated with a paraboloid which is being illuminated by a uniform plane wave, and computed the front-to-back ratio of unflanged and flanged paraboloids.Abstract:
An analysis is presented which uses the uniform geometrical theory of diffraction for determining the near fields diffracted by a paraboloid either with or without a conical flange attached to its circular rim when an axially propagated plane wave is incident on the concave or convex portion of the paraboloidal reflector. The field correlation theorem is used to determine the power coupled by a prime focus feed associated with the paraboloid which is being illuminated by a uniform plane wave. Based on this analysis, the front-to-back ratio of unflanged and flanged paraboloids is computed. Computed results show satisfactory agreement with the available measured as well as computed results based on alternative procedures. The variation in the on-axis gain on a prime-focus reflector when the feed is displaced from the focus is studied. Typical computed results are presented and compared with the available measured data. Computed results on the front-to-back ratio of paraboloids (flanged or unflanged) illuminated by a PFF whose radiated field exhibits phase variation over a constant radius are also presented. >read more
Citations
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Journal ArticleDOI
Accurate simulation of reflector antennas by the complex source-dual series approach
TL;DR: In this article, the problem is first formulated in terms of the dual series equations and then is regularized by the Riemann-Hilbert problem technique, and the resulting matrix equation is solved numerically with a guaranteed accuracy.
Book ChapterDOI
Numerical Modeling of Reflector Antennas
Oleg Yurtcev,Yuri Bobkov +1 more
TL;DR: In this paper, Rahmat-Samii et al. presented a mathematical model of the single-reflector paraboloid antenna and double-reflectors Paraboloid Cassegrain antenna based on physical optics method.
Journal ArticleDOI
Development of 2.5D Analytical Regularization Method for reflector antenna analysis
TL;DR: In this paper, a two-and-a-half dimensional analytical regularization method (2.5D ARM) was proposed to analyze reflector antennas for microwave, millimeter wave or ultra wide band applications.
Proceedings ArticleDOI
Effect of the off-focus shift of the feed on the radiation characteristics of a 2-D parabolic reflector antenna
TL;DR: In this article, the authors proposed the method of analytical regularization (MAR) for 3D and 2D reflector antennas in both polarizations, which can provide finer accuracy within a reasonable computation time.
References
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Journal ArticleDOI
Effect of arbitrary phase errors on the gain and beamwidth characteristics of radiation pattern
TL;DR: In this article, simple expressions have been obtained for predicting the maximum loss in antenna gain when the peak value of the aperture phase deviation is known, and relations have also been established such that the maximum change in the main-lobe beamwidth can be predicted from the knowledge of the amplitude distribution function and the peak phase deviation.
Journal ArticleDOI
On the front to back ratio of a parabolic dish antenna
TL;DR: In this article, an explicit expression for the radiation field in the back zone of a typical parabolic dish antenna was obtained for both the ideal 100 percent aperture efficiency feed and for an arbitrary, feed.
Journal ArticleDOI
GTD analysis of the near-field patterns of a prime-focus symmetric paraboloidal reflector antenna
M. Narasimhan,K. Prasad +1 more
TL;DR: In this article, the uniform geometrical theory of diffraction (UGTD) has been applied successfully to analyze the near-field patterns of a prime-focus paraboloid.
Journal ArticleDOI
A new method of analysis of the near and far fields of paraboloidal reflectors
M. Narasimhan,S. Christopher +1 more
TL;DR: An analytical technique for predicting accurately the near (electric and magnetic) fields as well as the far fields of a reflector antenna with a pencil beam is presented in this article, which involves the near field geometrical theory of diffraction (GTD) analysis of reflector antennas developed earlier and spherical vector mode functions.
Journal ArticleDOI
Radiation characteristics of a corrugated circular cylindrical waveguide horn excited in the TE/sub 11/ mode
M. Narasimhan,K.R. Govind +1 more
TL;DR: In this paper, the design and experimental studies on a corrugated circular cyclindrical waveguide antenna that is feed-excited in the TE/sub 11/mode with suppressed far-out sidelobes are reported.
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