A New Physical Optics Based Approach to Subreflector Shaping for Reflector Antenna Distortion Compensation

González-Valdés, Borja; Martínez-Lorenzo, José Ángel; Rappaport, Carey M.; Pino, A.G.

doi:10.1109/tap.2012.2220093

Cited by 27 publications

(15 citation statements)

References 15 publications

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“…Reflektör antenlerin analizleri için bilinen ve geliştirilen çeşitli yöntemler mevcuttur [6]. Bu yöntemlerden en çok kullanılanı yüzey akımının integralinden uzak alan ifadelerinin hesaplanmasıdır [7]. Bu yaklaşıma dayalı yöntemlerin başında Fiziksel Optik (FO) gelmektedir [8].…”

Section: Gi̇ri̇ş (Introduction)unclassified

Odak dışı beslemeli asimetrik ikili reflektör anten sistemlerinde eşdeğer paraboloid anten ve eşdeğer besleyici yöntemlerinin uygulanması

Turgut¹,

Yazgan²

2019

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Analysis of 3-D offfocus fed and asymmetric dual antenna systems  Equivalent paraboloid antenna and equivalent feed techniques  Radiation pattern calculations for asymmetric Cassegrain and Gregorian antenna systems Off-focus fed reflector antennas are preferred to prevent loss due to aperture blockage effect of secondary reflector and feed in the reflector antenna system. For this reason, it is important to calculate the radiation pattern in the direction of the main beam, especially for single and double reflector antennas with feeder antennas or antenna arrays shifted from the focal point. In this study, a new formulation is given for the acceleration of the calculation by applying the Physical Optics method is modeled by using and equivalent paraboloid reflector antenna and equivalent feed techniques in 3-D off-focus fed and asymmetric structures of dual antenna systems used in satellite-earth stations. Figure A. Application of Equivalent feed and Equivalent Paraboloid Techniques for 3-D off-focus fed and Asymmetric Cassegrain and Gregorian Antennas Purpose: Aimed to increase the speed of calculation by combining two different techniques which helps to obtain the radiation patterns of off-focus fed and asymmetric Cassegrain and Gregorian reflectors. Theory and Methods: It is possible to find an equivalent model for the radiation patterns of a Cassegrain or Gregorian antenna fed by an array, using equivalent feeding and equivalent paraboloid antenna methods. Results: Optimization methods and genetic algorithms for estimating the parameters required for the feed and reflector parts in calculations can be easily applied for different structures Conclusion: In the study given in detail above, two methods are combined to provide an easy and fast solution for the calculation of the radiation pattern in the complex physical structures for Cassegrain and Gregorian reflector antenna systems. This method saves time for calculating the radiation pattern in the main beam direction and for making the necessary optimizations, especially in using the PO integral.

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Section: Gi̇ri̇ş (Introduction)unclassified

Odak dışı beslemeli asimetrik ikili reflektör anten sistemlerinde eşdeğer paraboloid anten ve eşdeğer besleyici yöntemlerinin uygulanması

Turgut¹,

Yazgan²

2019

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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“…With the increasing frequency, the stringent requirements on reflector surface accuracy become demanding [2]. Towards the evaluation of surface accuracy on electromagnetic performance, several tolerance analysis techniques have been proposed in scientific literature for random error [3][4][5][6] and systematic error [7][8][9][10][11] in centered reflectors [7][8][9][10], offset reflectors [11], and membrane reflectors [11]. By performing tolerance analysis, the reflector antenna can be designed and manufactured with considering the surface tolerance.…”

Section: Introductionmentioning

confidence: 99%

An Approximation Mathematical Formula of Pattern Analysis for Distorted Reflector Antennas considering Surface Normal Vector Variation

Zhang¹,

Yang²,

Zhang

2016

International Journal of Antennas and Propagation

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An approximation mathematical formula to compute the distorted radiation pattern for reflector antennas is presented. In this approximation formula, besides the phase error caused by the structural deformation being added in the far field integral, the surface normal vector variation is also taken into consideration. The formula is derived by expanding the surface normal vector into a first-order Taylor series and the phase error into a second-order Taylor series. By assembling the integrals including the contributions of both surface normal vector variation and phase error, the far field electrical vector expressed as a function of structural nodal displacements is further obtained in a matrix form. Simulation results of a distorted reflector show the application of this formula.

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“…The method is implemented by inverting the matrix using singular value decomposition and Tikhonov regularisation. This approach can also be applied in distortion reconstruction [26] and compensation [27]. However, for the faceted reflectors the triangular side length is usually in the order of wavelength, and the IFM method asks a smaller side length to perform the procedure such as 0.788 l in [28], and mostly the desired far-field amplitude and phase information are usually not known in the beginning for a traditional synthesis.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of faceted reflector antennas and a contour beam synthesis technology

Zhang

Duan

Deng

2014

IET Microwaves, Antennas & Propagation

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Faceted reflectors are widely utilised in the application of satellite deployable antennas. The sensitivity analysis with respect to surface deformation is an essential part in the error evaluation for distorted reflector antennas. In this study, the sensitivity analysis of electrical radiation performance with respect to surface deformation for faceted reflectors is investigated. A contour beam pattern synthesis technology is proposed for the faceted reflector antennas based on sensitivity analysis, with considering the special characteristics of flat facets. Two faceted reflectors are simulated to show their directivity sensitivity with respect to surface nodal displacement, and a contour beam covering the continental United States (CONUS) with the desired directivity is obtained by shaping a single offset faceted reflector antenna.

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A New Physical Optics Based Approach to Subreflector Shaping for Reflector Antenna Distortion Compensation

Cited by 27 publications

References 15 publications

Odak dışı beslemeli asimetrik ikili reflektör anten sistemlerinde eşdeğer paraboloid anten ve eşdeğer besleyici yöntemlerinin uygulanması

Odak dışı beslemeli asimetrik ikili reflektör anten sistemlerinde eşdeğer paraboloid anten ve eşdeğer besleyici yöntemlerinin uygulanması

An Approximation Mathematical Formula of Pattern Analysis for Distorted Reflector Antennas considering Surface Normal Vector Variation

Sensitivity analysis of faceted reflector antennas and a contour beam synthesis technology

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