High Gaussicity feedhorns for sub-/ millimeter wave applications
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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.
Robertson , D A , McKay , J E , Hunter , R I , Speirs , P J & Smith , G M 2016 , High Gaussicity feedhorns for sub-/ millimeter wave applications . in 2016 41st International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) . , 7758492 , IEEE , 41st International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2016 , Copenhagen , Denmark , 25/09/16 . DOI: 10.1109/IRMMW-THz.2016.7758492conference
2016 41st International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)
© 2016, IEEE. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at ieeexplore.ieee.org / https://doi.org/10.1109/IRMMW-THz.2016.7758492
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