High Gaussicity feedhorns for sub-/ millimeter wave applications

Duncan A. Robertson, Johannes E. McKay, Robert I. Hunter, Peter J. Speirs, Graham M. Smith

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)
1 Downloads (Pure)

Abstract

In feedhorn design, the power coupling to the fundamental free-space LG00 mode, or Gaussicity, is a good proxy for high performance, particularly the sidelobe and cross-polar levels and the near-field behavior. Gaussicity can be maximized by ensuring that the first few horn modes reach the aperture with the appropriate phase and amplitude relationship. We present two feedhorn designs for which the Gaussicity was maximized in order to achieve high performance. The first is a 94 GHz corrugated horn with a tanh-linear profile, manufactured by electroforming, which achieves a Gaussicity of 99.92% at band center and sidelobes at the -60 dB level. The second is a 340 GHz smooth-walled spline horn which achieves a Gaussicity of >99.2% over a 10% bandwidth, sidelobes below -30 dB and excellent near-field behavior. This design has been successfully fabricated in E-plane split block suitable for low volume manufacture, for example for imaging arrays.

Original languageEnglish
Title of host publication2016 41st International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)
PublisherIEEE
Number of pages2
ISBN (Electronic)9781467384858
DOIs
Publication statusPublished - 28 Nov 2016
Event41st International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2016 - Copenhagen, Denmark
Duration: 25 Sept 201630 Sept 2016
Conference number: 41
http://www.irmmw-thz2016.org/

Conference

Conference41st International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2016
Abbreviated titleIRMMW-THZ
Country/TerritoryDenmark
CityCopenhagen
Period25/09/1630/09/16
Internet address

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