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Characterization of Asymmetric Coplanar Waveguide DiscontinuitiesA general technique to characterize asymmetric coplanar waveguide (CPW) discontinuities with air bridges where both the fundamental coplanar and slotline modes may be excited together is presented. First, the CPW discontinuity without air bridges is analyzed using the space-domain integral equation (SDIE) approach. Second, the parameters (phase, amplitude, and wavelength) of the coplanar and slotline modes are extracted from an amplitude modulated-like standing wave existing in the CPW feeding lines. Then a 2n x 2n generalized scattering matrix of the n-port discontinuity without air bridges is derived which includes the occurring mode conversion. Finally, this generalized scattering matrix is reduced to an n x n matrix by enforcing suitable conditions at the ports which correspond to the excited slotline mode. For the purpose of illustration, the method is applied to a shielded asymmetric short-end CPW shunt stub, the scattering parameters of which are compared with those of a symmetric one. Experiments are performed on both discontinuities and the results are in good agreement with theoretical data. The advantages of using air bridges in CPW circuits as opposed to bond wires are also discussed.
Document ID
20000064906
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dib, Nihad I.
(Michigan Univ. Ann Arbor, MI United States)
Katehi, Linda P. B.
(Michigan Univ. Ann Arbor, MI United States)
Gupta, Minoo
(Texas Instruments, Inc. Dallas, TX United States)
Ponchak, George E.
(NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
August 19, 2013
Publication Date
September 1, 1993
Publication Information
Publication: IEEE Transactions on Microwave Theory and Techniques
Publisher: Institute for Electrical and Electronic Engineers
Volume: 41
Issue: 9
Subject Category
Communications And Radar
Funding Number(s)
PROJECT: RTOP 632-6E-51
OTHER: NSF ECS-86-57951
Distribution Limits
Public
Copyright
Other

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