Modern Design Techniques of Cassegrainian Antennas

Abstract

A short review on the modern design techniques of Cassegrainian antennas having high efficiency is presented. Attention is focussed on the following techniques: (a) Cassegrainian antenna with far-field feed, (b) Casegrainian antenna with near-field feed, (c) geometrical optics technique for shaping subreflector and reflector, (d) diffraction method for shaping subreflector and reflector, (e) use of dielectric guiding structure (dielguide).

Relative merits and demerits of the techniques are discussed. Design procedure and formulae illustrating the techniques are given.

Indexing Terms:

• Microwave Antennas
• Reflector-Type Antennas
• High-Efficiency Antennas
• Feed Design

Additional information

Notes on contributors

G. S. Sanyal

SANYAL, G S (Prof.): BSc (Hons.), MSc: Worked for two years with AIR and proceeded to England in 1945 and studied for two separate; Diploma courses of Marconi College. Was trained as an Apprentice in Marconi's Wireless Telegraph Co., England and later worked with Pye Limited. Joined IIT, Kharagpur in the E & ECE Department as Assistant Professor (1954) and later became Professor (1962) and Head of the ECE Department (1966).

Received personal invitation from the Academy of Sciences, USSR, for attending the International Conference on Physics of Ferromagnetic Phenomena in 1966. Worked at several Universities in the USA in the field of Electro-magnetics as a Visiting Scientist during 1960–61 and 1975–76.

Professor Sanyal has carried out research in the field of microwave ferromagnetics, scattering, antennas and phased arrays, and published over 25 papers. He has built up a school of Research in the field of Electromagnetics, Microwaves and Antennas at IIT, Kharagpur and also served as a member of various Expert Committees set up by the Government. At present, he is Head of the Centre for Research and Training in Radar and Communication, IIT, Kharagpur.

Prof. Sanyal is FIE, FNA, MIETE. Received Ram Lal Wadhwa Gold Medal—1976 of IETE. Appointed Honorary Editor for JIETE in the area of ‘Electromagnetics including antennas, propagation and microwaves.'

B. Sen

SEN, B: (b. 1945 Dec. 2). He obtained BSc (Hon. in Physics) in 1965 from Calcutta University, BTech (Hons) in Electronics and Electrical Communication in Engg. in 1968 from IIT, Kharagpur, and MTech in Microwave and Radar Engineering in 1970 from IIT, Kharagpur. From Dec. 1970 to March 1974, he was a Research Scholar in the Deptt. of Electronics & Electrical Communication Engg., IIT, Kharagpur; the field of research was the antenna synthesis of a line source and a circular aperture. Since April 1974, he is a Lecturer of Radar and Communication Centre, IIT, Kharagpur, and engaged in the research and developments of various microwave antennas and related fields.