Electromechanical coupling analysis method of deformed dual-reflector antennas
Dual-reflector antennas are common in radar,satellite communications,radio astronomy,and other applications.To analyze the electrical performance of a deformed dual-reflector antenna,an electromechanical coupling analysis method based on Physical Optics is proposed.The influence of the main and subreflector deformation of the dual-reflector antennas on the electrical properties is thoroughly investigated,and the electromechanical coupling relationship between the displacement field of the surface structure of the reflector and the far field of the antenna is established by converting the axial deformation of the main and subreflector into the phase error influencing term in the antenna far-field integral formula.Furthermore,the phase error influence term grows as a first-order Taylor series so that the structural error is independent of the antenna far-field integration operation and the fast calculation of the far field of the deformed dual-reflector antenna is realized by constructing an error matrix containing the main and subreflector deformation information.A case study of a 2.2 m antenna validates the correctness of the proposed method.
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