A Hybrid Perturbative Technique to Characterize the Coupling Between a Corrugated Horn and a Reflector Dish

Bolli, Pietro; Gentili, Gian Guido; Lucci, L.; Nesti, R.; Pelosi, Giuseppe; Toso, Giovanni

doi:10.1109/tap.2005.863133

Cited by 15 publications

(7 citation statements)

References 13 publications

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“…This method is very fast and insightful, while MoM-level accuracy can be achieved for single-horn feeds, but not for array feeds as demonstrated in this paper. An alternative approach is to use more versatile, though more time-consuming, hybrid numerical methods combining Physical Optics or Gaussian beams for the analysis of reflectors with MoM and/or Mode Matching techniques for horn feeds [21], [22]. The recent article [23] has introduced the PO/Generalized-ScatteringMatrix approach for solving multiple domain problems, and has shown its application to a cluster of a few horns.…”

Section: Introductionmentioning

confidence: 99%

Fast and Accurate Analysis of Reflector Antennas With Phased Array Feeds Including Multiple Reflections Between Feed and Reflector

Iupikov

Maaskant

Ivashina

et al. 2014

IEEE Trans. Antennas Propagat.

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Abstract-Several electrically large Phased Array Feed (PAF) reflector systems are modeled to examine the mechanism of multiple reflections between parabolic reflectors and low-and highscattering feeds giving rise to frequency-dependent patterns and impedance ripples. The PAF current is expanded in physics-based macro domain basis functions (CBFs), while the reflector employs the Physical Optics (PO) equivalent current. The reflector-feed coupling is systematically accounted for through a multiscattering Jacobi approach. An FFT expands the reflector radiated field in only a few plane waves, and the reflector PO current is computed rapidly through a near-field interpolation technique. The FEKO software is used for several cross validations, and the convergence properties of the hybrid method are studied for several representative examples showing excellent numerical performance. The measured and simulated results for a 121-element Vivaldi PAF, which is installed on the Westerbork Synthesis Radio Telescope, are in very good agreement.Index Terms-phased array feeds, radio astronomy, method of moments, characteristic basis function method, physical optics.

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Section: Introductionmentioning

confidence: 99%

Fast and Accurate Analysis of Reflector Antennas With Phased Array Feeds Including Multiple Reflections Between Feed and Reflector

Iupikov

Maaskant

Ivashina

et al. 2014

IEEE Trans. Antennas Propagat.

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“…In a perturbative approach both the field and the eigenvalue are decomposed in series: and where and are respectively the eigenfunction and eigenvalue of the unperturbed problem [7], [8]. The development can be truncated to the first order so that (1) becomes (2) It is (3) but it is both on and on its subset , and if the perturbation is small we can assume the term 1531-1309 © 2015 IEEE.…”

Section: Perturbative Approachmentioning

confidence: 99%

“…The perturbative analysis of a device is useful under many points of view, such as device sensitivity [7] or approximate analysis [8]. For waveguides, perturbative approaches have been useful for the quick analysis of changes in the propagation constant due to a change in the medium inside the waveguide, a relevant problem in optics [9], [10].…”

Section: Introductionmentioning

confidence: 99%

A Line Integral Perturbative Approach to the Computation of Cutoff Frequencies in Deformed Waveguides

Gentili

Pelosi

Selleri

2015

IEEE Microw. Wireless Compon. Lett.

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“…Furthermore, due to its simplicity Haar wavelets are widely employed. The scaling function is tfi..-x), and the mother wavelet function is lfJ{x) , these are defined as [14]: (13) And, (14) [ (5) Where ( m or j ) are the resolution level and (n) is the translation factor…”

Section: Bl Basis Functionsmentioning

confidence: 99%

Electromagnetic scattering from Conical Horn analysis using wavelet-based moment method

Lashab

Benabdelaziz

Zebiri

2009

2009 Mediterrannean Microwave Symposium (MMS)

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In this paper Conical horn Antenna has been analyzed by two methods, the first one is an asymptotic one which is the aperture integration based on the geometrical optics (GO), the second one is a numerical method based on the well known moment method and improved by wavelets. In this work we intend first to introduce the application of wavelet in electromagnetic scattering, then a comparison of the two method of analysis is presented to show the limit of use of the asymptotic method and to emphasize on the fact that moment method is an exact method which is improved by the introduction of wavelet by reduction of both memory space and processing time, this is well presented and compared with different type wavelets.Index Terms-Moment Method, Wavelets, Horn antenna, Aperture integration.which is an asymptotic method, with the wavelet technique which is based on the moment method for future combination between these two methods, because for very large size structures, even very powerful methods may face the problem of memory space and computing time. Many work have been curried out using wavelet to solve electromagnetic problems the results are very promising [8][9][10] [11]. The conical horn antenna is excited at the mode TEll and the frequency of work is 12 GHz.The theoretical contents is expressed in the next section, which consists of three subsections, The first subsection is dedicated to the Aperture integration and problem description, the second subsection is about integral equation and Moment Method formulation, the last subsection is for orthogonal wavelet expansion and finally Numerical results. II. FORMULATION A. Moment Method Formulation A.l Integral equationThe current density is expressed by the tangential components, the fact that the antenna is a body of revolution, the current is expanded as follow:K(J(r» =~J(r)-nX 1J(r')XV'G(r, r').ds' (1) K(J(r)) = Ii X Hi (r)(2) +00 J(t, rp) = I [J t (t, rp).t + J 9' (t, rp).~lejv.9'The Conical Horn is studied in 2D as shown in figure 1, the surface of this latter is considered to be perfect conductor. Using the boundary condition, the scattered field may be written as an integral magnetic equation in two dimensions as [12].

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A Hybrid Perturbative Technique to Characterize the Coupling Between a Corrugated Horn and a Reflector Dish

Cited by 15 publications

References 13 publications

Fast and Accurate Analysis of Reflector Antennas With Phased Array Feeds Including Multiple Reflections Between Feed and Reflector

Fast and Accurate Analysis of Reflector Antennas With Phased Array Feeds Including Multiple Reflections Between Feed and Reflector

A Line Integral Perturbative Approach to the Computation of Cutoff Frequencies in Deformed Waveguides

Electromagnetic scattering from Conical Horn analysis using wavelet-based moment method

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