Efficiency Optimization of Spherical Reflectors by Feed Position Adjustments

Maria Alonso-Delpino, Paul Goldsmith, Coralie Elmaleh, Theodore Reck, Goutam Chattopadhyay

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)


This letter presents a numerical study of the best performance achievable using a spherical reflector with a point feed and without any corrective element. We evaluate in detail the aperture efficiency that can be obtained with a spherical reflector with linearly polarized Gaussian beam illumination. A 100 GHz, 30 cm diameter spherical reflector from a parent sphere of 30 cm radius has been built and measured. The maximum directivity of 46.1 dB agrees closely with the predictions of electromagnetic modeling, as does the increase in the directivity by more than 3 dB resulting from moving the feed by 0.7 cm closer to the reflective surface relative to the paraxial focal point.

Original languageEnglish
Article number8030051
Pages (from-to)2865-2868
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
Publication statusPublished - 1 Jan 2017
Externally publishedYes


  • Inflatable antenna
  • millimeter wave
  • spherical reflector


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