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Substrate-Integrated-Waveguide Circulators Suitable for Millimeter-Wave Integration

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2 Author(s)
D'Orazio, W. ; COMDEV Inc, Cambridge, Ont. ; Ke Wu

Over the years, many millimeter-wave circulator techniques have been presented, such as nonradiative dielectric and fin-line circulators. Although excellent results have been demonstrated in the literature, their proliferation in commercial devices has been hindered by complex assembly cost. This paper presents a study of substrate-integrated millimeter-wave degree-2 circulators. Although the substrate integrated-circuits technique may be applied to virtually any planar transmission medium, the one adopted in this paper is the substrate integrated waveguide (SIW). Two design configurations are possible: a planar one that is suitable for thin substrate materials and a turnstile one for thicker substrate materials. The turnstile circulator is ideal for systems where the conductor losses associated with the thin SIW cannot be tolerated. The design methodology adopted in this paper is to characterize the complex gyrator circuit as a preamble to design. This is done via a commercial finite-element package

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:54 ,  Issue: 10 )

Date of Publication:

Oct. 2006

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