Novel wide-band coplanar waveguide-to-rectangular waveguide transition

• Published in: IEEE transactions on microwave theory and techniques Vol. 52; no. 8; pp. 1836 - 1842
• Main Authors: Mottonen, V.S., Raisanen, A.V.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-08-2004; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Circuit testing; Coplanar waveguides; Electromagnetic measurements; Electromagnetic waveguides; Loss measurement; Millimeter wave circuits; Millimeter wave measurements; Optical device fabrication; Waveguide transitions; Wideband
• ISSN: 0018-9480; 1557-9670
• DOI: 10.1109/TMTT.2004.831580

A new coplanar waveguide (CPW)-to-rectangular waveguide transition is proposed for wide-band millimeter-wave applications. The transition has an in-line structure, which provides easy fabrication of the CPW circuit and waveguide block. An X-band (8.2-12.4 GHz) model has been designed and tested. Measurements of a back-to-back double transition have yielded a return loss of over 17 dB and an insertion loss of less than 0.5 dB over the full X-band. These results agree well with the simulated results obtained with a commercial electromagnetic structure simulator. In addition, this type of a transition has been designed and used for a local oscillator feed with a full F-band (90-140 GHz) coverage of a submillimeter-wave general-purpose harmonic mixer.