A design method of an offset trireflector antenna whose main reflector is of an offset parabola type with high efficiency and low cross polarization characteristics
✍ Scribed by Katsuhiko Aoki; Shigeru Makino; Masanori Masuda; Shuji Urasaki
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 272 KB
- Volume
- 83
- Category
- Article
- ISSN
- 8756-6621
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✦ Synopsis
A design method is developed for a high efficiency and low cross polarization offset tri-reflector antenna made of an offset parabolic main reflector and two shaped reflectors. In this method, the main reflector is an offset parabola while the #2 reflector corresponding to a subreflector and the #1 reflector as the focussing reflector are shaped by a method using reflector shaping functions. Further, the reflector system is selected as an initial value such that a low cross polarization characteristic is obtained after reflector shaping. As a method for determination of such initial values, a new reflector configuration transformation method is developed. Those design methods are applied to an offset tri-reflector antenna with an aperture diameter of 250 wavelengths. Validity of the design is confirmed by a numerical calculation.