Optimal subreflector position determination of shaped dual-reflector antennas based on the parameters iteration approach
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摘要
A new method based on the parameters iteration technique has been developed to determine the optimal subreflector position for shaped Cassegrain antennas, that are distorted by gravity, to improve their electromagnetic(EM) performance. Both the features of shaped surface and the relationship between optical path difference(OPD) and far field beam pattern are employed. By describing the shaped dualreflector surface as a standard discrete parabola set, we can utilize the optical features of the standard Cassegrain system in the classical OPD relationship. Then, the actual far field beam pattern is expressed as the synthesis of ideal beam and error beam by decomposing subreflector adjustment parameters using a mechanical-electromagnetic-field-coupling-model(MEFCM). Furthermore, a numerical method for determining optimal subreflector position is presented. The proposed method is based on the iteration technique of subreflector adjustment parameters, and the optimal far field pattern is used for the iteration. The numerical solution of optimal adjustment parameters can be obtained rapidly. Results for a 25 m shaped Cassegrain antenna demonstrate that the adjustment of the subreflector to the optimal position as determined by the proposed method can improve the EM performance effectively.
A new method based on the parameters iteration technique has been developed to determine the optimal subreflector position for shaped Cassegrain antennas, that are distorted by gravity, to improve their electromagnetic(EM) performance. Both the features of shaped surface and the relationship between optical path difference(OPD) and far field beam pattern are employed. By describing the shaped dualreflector surface as a standard discrete parabola set, we can utilize the optical features of the standard Cassegrain system in the classical OPD relationship. Then, the actual far field beam pattern is expressed as the synthesis of ideal beam and error beam by decomposing subreflector adjustment parameters using a mechanical-electromagnetic-field-coupling-model(MEFCM). Furthermore, a numerical method for determining optimal subreflector position is presented. The proposed method is based on the iteration technique of subreflector adjustment parameters, and the optimal far field pattern is used for the iteration. The numerical solution of optimal adjustment parameters can be obtained rapidly. Results for a 25 m shaped Cassegrain antenna demonstrate that the adjustment of the subreflector to the optimal position as determined by the proposed method can improve the EM performance effectively.
A new method based on the parameters iteration technique has been developed to determine the optimal subreflector position for shaped Cassegrain antennas, that are distorted by gravity, to improve their electromagnetic(EM) performance. Both the features of shaped surface and the relationship between optical path difference(OPD) and far field beam pattern are employed. By describing the shaped dualreflector surface as a standard discrete parabola set, we can utilize the optical features of the standard Cassegrain system in the classical OPD relationship. Then, the actual far field beam pattern is expressed as the synthesis of ideal beam and error beam by decomposing subreflector adjustment parameters using a mechanical-electromagnetic-field-coupling-model(MEFCM). Furthermore, a numerical method for determining optimal subreflector position is presented. The proposed method is based on the iteration technique of subreflector adjustment parameters, and the optimal far field pattern is used for the iteration. The numerical solution of optimal adjustment parameters can be obtained rapidly. Results for a 25 m shaped Cassegrain antenna demonstrate that the adjustment of the subreflector to the optimal position as determined by the proposed method can improve the EM performance effectively.
引文
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Wang,C.,Duan,B.,&Qiu,Y.2007,Structural and Multidisciplinary Optimization,33,519
Wang,C.,Wang,Y.,Wang,Z.,et al.2018,International Journal of Electronics,105,586
Wang,W.,Wang,C.,Duan,B.,Leng,G.,&Li,X.2013,IETMicrowaves,Antennas&Propagation,8,158
Zhang,S.,Wang,C.,&Zhang,X.2018,International Journal of Electronics,105,211
Ban,Y.,Duan,B.,Wang,C.,et al.2017,IEEE Transactions on Antennas and Propagation,65
Doyle,K.B.2009,in Optical Modeling and Performance Predictions IV,7427,International Society for Optics and Photonics,74270D
Duan,B.Y.,&Wang,C.S.2009,IEEE Transactions on Antennas and Propagation,57,3409
Lian,P.,Duan,B.,Wang,W.,et al.2015,IEEE Transactions on Antennas and Propagation,63,4546
Lian,P.,Wang,W.,&Hu,N.2014,IET Microwaves,Antennas&Propagation,8,701
Milligan,T.A.2005,Modern Antenna Design(John Wiley&Sons)
Ruze,J.1969,Small Displacements in Parabolic Reflectors,Tech.Rep.,Lincoln Laboratory
Song,L.,Duan,B.,&Zheng,F.2009,Systems Engineering and Electronics,31,1269,in Chinese
Wang,C.,Duan,B.,&Qiu,Y.2007,Structural and Multidisciplinary Optimization,33,519
Wang,C.,Wang,Y.,Wang,Z.,et al.2018,International Journal of Electronics,105,586
Wang,W.,Wang,C.,Duan,B.,Leng,G.,&Li,X.2013,IETMicrowaves,Antennas&Propagation,8,158
Zhang,S.,Wang,C.,&Zhang,X.2018,International Journal of Electronics,105,211