A waveguide orthomode transducer for 385-500 GHz

A. Navarrini, Christopher Groppi, G. Chattopadhyay

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

3 Scopus citations

Abstract

We describe the design, construction, and performance of a waveguide Orthomode Transducer (OMT) for the 385-500 GHz band. The OMT is based on a symmetric backward coupling structure and has a square waveguide input (0.56x0.56 mm2) and two single-mode waveguide outputs: a standard WR2.2 waveguide (0.56x0.28 mm2) and an oval waveguide with full-radius corners. The OMT is rescaled from a lower frequency design that was developed for the 3 mm band; it was optimized using a commercial 3D electromagnetic simulator. The OMT consists of two mechanical blocks in split-block configuration that were fabricated using conventional CNC milling machine. A first prototype copper alloy OMT employing standard UG387 flanges at all ports was fabricated and tested. From 385 to 500 GHz the measured input reflection coefficient was less than -10 dB, the isolation between the outputs was less than -25 dB, the cross polarization was less than -10 dB, and the transmission was ≈-2 dB at room temperature for both polarization channels. The effects of misalignment errors in the OMT performance were studied using electromagnetic simulation. A second OMT version utilizing custom made mini-flanges and much shorter waveguides was designed and will be tested soon. This novel OMT is more tolerant to misalignment errors of the block halves and is expected to have much improved performance over the first prototype.

Original languageEnglish (US)
Title of host publication21st International Symposium on Space Terahertz Technology 2010, ISSTT 2010
Pages281-290
Number of pages10
StatePublished - Dec 1 2010
Event21st International Symposium on Space Terahertz Technology 2010, ISSTT 2010 - Oxford, United Kingdom
Duration: Mar 23 2010Mar 25 2010

Publication series

Name21st International Symposium on Space Terahertz Technology 2010, ISSTT 2010

Other

Other21st International Symposium on Space Terahertz Technology 2010, ISSTT 2010
CountryUnited Kingdom
CityOxford
Period3/23/103/25/10

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Space and Planetary Science
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Radiation

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    Navarrini, A., Groppi, C., & Chattopadhyay, G. (2010). A waveguide orthomode transducer for 385-500 GHz. In 21st International Symposium on Space Terahertz Technology 2010, ISSTT 2010 (pp. 281-290). (21st International Symposium on Space Terahertz Technology 2010, ISSTT 2010).