Advertisement

The Design of Potter Horns for THz Applications Using a Genetic Algorithm

  • P. Kittara
  • A. Jiralucksanawong
  • G. Yassin
  • S. Wangsuya
  • J. Leech
Article

Abstract

We describe the design and performance of Potter horns at millimetre and submillimetre wavelength employing a novel software package that we have developed, using Genetic Algorithm. The horn is easy to fabricate and exhibits excellent beam circularity and low cross polarization over a 15% bandwidth which is sufficient for many applications. Excitation of the required higher order modes is done by either a step or a flare discontinuity at the horn throat. In each case we provide design curves that give the optimum parameters of the horn geometry as a function of frequency and beamwidth. The range of values provided covers the parameters required for the design of horns for telescope feeds and various other instruments. The design curves show clearly that the flare-step performance is superior to the traditional groove-step Potter horn. The simulations for designing these horns were carried out at millimetre and submillimetre wavelengths but the results can be scaled to lower or higher frequencies. A key component in the design method is the optimization software that searches for the correct magnitude and location of the flare discontinuities. We have developed a software package based on the combination of modal matching, a genetic algorithm (GA) and downhill simplex optimization. The genetic code is first used to locate the proximity of the global minimum. The set of parameters obtained are then used as a starting point for the simplex method, which refines the parameters to the required accuracy.

Keywords

Potter horn Horn antenna Genetic algorithm 

Notes

Acknowledgements

This work has been supported by Thailand Research Fund and the UK STFC.

References

  1. 1.
    P. Potter, A new horn antenna with suppressed sidelobes and equal beamwidths, Microwave J. 6, 71–78 (1963).Google Scholar
  2. 2.
    H. Pickett, J. Hardy, and J. Farhoomand, Characterisation of a dual mode horn for submillimetre wavelengths, IEEE Trans. Microwave Theory Tech. MTT32(8), 936–937 (1984).CrossRefADSGoogle Scholar
  3. 3.
    P. Kittara et al., A 700-GHz SIS antipodal finline mixer fed by a Pickett-Potter Horn-Reflector antenna, IEEE Trans. Microwave Theory Tech. 52(10) 2352–2360 (2004), Oct.CrossRefGoogle Scholar
  4. 4.
    S. B. Cohn, Flare angle changes in a horn as a mean of pattern control, Microwave J. 41–46 (1970), Oct.Google Scholar
  5. 5.
    A. Olver, P. Clarricoats, A. Kishk, and A. Shafai, Microwave Horns and Feeds. (Bookcraft, Bath, 1994).Google Scholar
  6. 6.
    P. Kittara, PhD Thesis. Cambridge University (2002).Google Scholar
  7. 7.
    C. Granet, G. L., James, R. Bolton, and G. Moorey, A smooth-walled spline-profile horn as an alternative to the corrugated horn for wide band millimeter-wave applications, IEEE Trans. Antenna Propagat. 52(3), 848–854 (2004).CrossRefGoogle Scholar
  8. 8.
    R. L. Haupt, and S. E. Haupt, Practical Genetic Algorithms. (Wiley-Interscience Publication, 1998).Google Scholar
  9. 9.
    G. Yassin, P. Kittara, A. Jiralucksanawong, S. Wangsuya, J. Leech, and M. E. Jones, “A High Performance Horn for Large Format Focal Plane Arrays” To appear in the Proceeding of the 18th Int. Symposium Space Terahertz Technology, Pasadena, USA, 2007.Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • P. Kittara
    • 1
  • A. Jiralucksanawong
    • 1
  • G. Yassin
    • 2
  • S. Wangsuya
    • 1
  • J. Leech
    • 2
  1. 1.Physics DepartmentMahidol UniversityBangkokThailand
  2. 2.Department of PhysicsUniversity of OxfordOxfordUK

Personalised recommendations