ISSTT Proceedings

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High performance smooth-walled feed horns for focal plane arrays

Authors:
P. Kittara, J. Leech, G. Yassin, B.K. Tan, A. Jiralucksanawong, S. Wangsuya
Abstract:
We describe the design and testing of an easy-tomachine smooth-walled horn which exhibits excellent beam circularity and low cross polarisation over a relatively large bandwidth. The design comprises three coaxial conical sections and two flare discontinuities joining the three sections together. The discontinuities generate appropriate higher order modes which combine to give a circular field distribution at the aperture. The positions and sizes of these discontinuities were calculated using a genetic algorithm. The horn was fabricated either by using the well known electroforming method or simply by a drill tool, shaped into the horn profile, and a standard mill. The measured radiation patterns or the electroformed horns show good excellent circularity and agree well with the calculated curves. They also show that the three-section horn has a substantially wider bandwidth than the conventional Potter horn. Preliminary measurements of the drilled horns patterns are also shown and compared with theory.
Categories:
Components, Optics
Year:
2008
Session:
12
Full-text:
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Page Number(s):
346-350