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

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2 Author(s)
Mottonen, V. ; Millimetre Wave Lab. of Finland - MilliLab, Helsinki Univ. of Technol., Espoo, Finland ; Raisanen, A.V.

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.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:52 ,  Issue: 8 )