A Design Optimization Framework for Multi-Band Body-of-Revolution Antenna Feeds – Application to Prime-Focus Dual-Band Ku/X Coaxial Feed

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Authors
  1. Choinière, É.
  2. Morin, G.A.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
The development of software radios has brought about a need for multi-band antenna feeds for use in the radio-frequency front-ends of satellite ground terminals. To provide the tools necessary for the design of such feeds, we have developed the Framework for Antenna Design and Optimization (FADO), a computer-based antenna design optimization framework based on the combination of custom-designed synthesis and analysis software, a commercial body of-revolution electromagnetics simulation tool (AKBOR2, by Kishk Consulting), a high frequency reflector modelling tool (Grasp, by TICRA), and a global optimizer (glbfast, part of the Tomlab optimization suite). The capabilities of this new design tool are demonstrated through the design of a compact dual-band Ku/X coaxial antenna feed for a 4.6-m single reflector antenna. A compact dual-band feed was designed by combining a dielectric-filled circular waveguide ending in a tapered dielectric rod, which launches the Ku-band waves, and a coaxial aperture launching the X-band waves. The use of a high dielectric constant material (Εr= 9.8) within the Ku-band's circular waveguide resulted in a fairly compact dual-band feed design aperture with an outer diameter of 2.8 cm. Directly integrating both the feed scattering parameters and the secondary beam characteristics within a global optimization loop, this dual-band Ku/X coaxial antenna feed was designed and optimized using FADO. Proper reflector illumination was achieved

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Keywords
Multi-band antennas;Body of revolution;Design optimization;Satellite Ground Terminal;Antenna feed;Global optimization
Report Number
DRDC-OTTAWA-TM-2005-216 — Technical Memorandum
Date of publication
01 Dec 2005
Number of Pages
44
DSTKIM No
CA026984
CANDIS No
524996
Format(s):
CD ROM

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