Compact duplexing for a 680-GHz radar using a waveguide orthomode transducer

Leal Sevillano, Carlos Alberto and Cooper, Ken B. and Decrossas, Emmanuel and Dengler, Robert J. and Ruiz Cruz, Jorge A. and Montejo Garai, José R. and Chattopadhyay, Goutam and Rebollar Machain, Jesús María (2014). Compact duplexing for a 680-GHz radar using a waveguide orthomode transducer. "IEEE Transactions on Microwave Theory and Techniques", v. 62 (n. 11); pp. 2833-2842. ISSN 0018-9480. https://doi.org/10.1109/TMTT.2014.2359636.

Description

Title: Compact duplexing for a 680-GHz radar using a waveguide orthomode transducer
Author/s:
  • Leal Sevillano, Carlos Alberto
  • Cooper, Ken B.
  • Decrossas, Emmanuel
  • Dengler, Robert J.
  • Ruiz Cruz, Jorge A.
  • Montejo Garai, José R.
  • Chattopadhyay, Goutam
  • Rebollar Machain, Jesús María
Item Type: Article
Título de Revista/Publicación: IEEE Transactions on Microwave Theory and Techniques
Date: November 2014
Volume: 62
Subjects:
Freetext Keywords: Duplexer, orthomode transducer, terahertz radar
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Señales, Sistemas y Radiocomunicaciones
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

A compact 680-GHz waveguide orthomode transducer (OMT) and circular horn combination has been designed, tested, and characterized in a radar transceiver's duplexer. The duplexing capability is implemented by a hybrid waveguide quasi optical solution, combining a linear polarization OMT and an external grating polarizer. Isolation between the OMT's orthogonal ports' flanges was measured with a vector network analyzer to exceed 33 dB over a >10% bandwidth between 630 and 710 GHz. Calibrated Y-factor measurements using a mixer attached to the OMT ports reveal losses through the transmit and receive paths that sum to an average of 4.7 dB of two-way loss over 660-690 GHz. This is consistent with radar sensitivity measurements comparing the new OMT/horn with a quasi-optical wire grid beam splitter. Moreover, the radar performance assessment validates the OMT as a suitable compact substitute of the wire grid for the JPL's short-range 680-GHz imaging radar.

More information

Item ID: 36061
DC Identifier: http://oa.upm.es/36061/
OAI Identifier: oai:oa.upm.es:36061
DOI: 10.1109/TMTT.2014.2359636
Official URL: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=true&arnumber=6919342
Deposited by: Memoria Investigacion
Deposited on: 01 Jul 2015 18:12
Last Modified: 01 Jul 2015 18:12
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