Synthesis Method Of The Cassegrain Type
Unsymmetrical Antennas
Author(s)
R. Dufrêne, W. Kołosowski, E. Sędek & A. Jeziorski
Abstract
A new method for the synthesis of the Cassegrain type unsymmetrical dualreflector
antennas is presented. The algorithm of synthesis is based on a scheme
similar that which is used for designing reflector cosecant antennas. The \“open
Cassegrain” antenna is used as the basic prototype. The calculations solve
differential equations by means of the Runge-Kutta method.
Keywords: Cassegrain antenna, offset reflector antenna.
1 Introduction
The synthesis of unsymmetrical dual-reflector antennas is one of the most
important problems in the antenna theory. It is formulated in the following
manner: having a horn with an axial symmetrical radiation pattern G(ϕ) we must
obtain a geometry of the sub-reflector and reflector of the unsymmetrical antenna
that will give a desired aperture field distribution E(ρ).
This problem has been studied by many authors, but the results obtained by
them are very complicated [1, 2].
The proposed solution of synthesis problem for the unsymmetrical dualreflector
antennas consists of three main stages:
1. Calculation of the function ρ(ϕ) for main cross-section (aperture is crossed
at point ρ by sending the ray from the source under the angle ϕ, as in Fig.1);
2. Calculation of the main cross-section of the antenna;
3. Calculation of the sub-reflector and reflector surfaces.
It follows from above that the method of synthesis described here is based on
the well-known idea of synthesis of the cosecant reflector antenna. From the
point of view of the design considerations, this synthesis problem is solved by
Keywords
Cassegrain antenna, offset reflector antenna.
Related Book
Other papers in this volume
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