A New Method of Designing Circularly Symmetric Shaped Dual Reflector Antennas Using Distorted Conics. (16th December 2014)

• Record Type: Journal Article
• Authors: Zaman, Mohammad Asif; Matin, Md. Abdul
• Other Names: Gonzalo Ramon Academic Editor.
• Is Part Of: International journal of microwave science and technology. Volume 2014(2014)
• Publication Date: 2014-12-16
• Subjects: Radio frequency -- Periodicals; Microwave circuits -- Periodicals; Radiofréquences; Circuits pour micro-ondes; Microwave circuits; Radio frequency; Periodicals; Electronic journals; 621.3813
• DOI: 10.1155/2014/849194
• Languages: English
• ISSNs: 1687-5826

Abstract

Abstract : A new method of designing circularly symmetric shaped dual reflector antennas using distorted conics is presented. The surface of the shaped subreflector is expressed using a new set of equations employing differential geometry. The proposed equations require only a small number of parameters to accurately describe practical shaped subreflector surfaces. A geometrical optics (GO) based method is used to synthesize the shaped main reflector surface corresponding to the shaped subreflector. Using the proposed method, a shaped Cassegrain dual reflector system is designed. The field scattered from the subreflector is calculated using uniform geometrical theory of diffraction (UTD). Finally, a numerical example is provided showing how a shaped subreflector produces more uniform illumination over the main reflector aperture compared to an unshaped subreflector.