Analysis and modeling of multi-mode effects in coplanar waveguide bends Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/gm80hz87s

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  • A novel method for modeling bends in coplanar waveguides (CPWs) is described. The CPW can be viewed as a pair of parallel coupled quasi-slot lines. Bends in the CPW are modeled as a non-uniform coupled line system in terms of their even- and odd- mode characteristics. This modeling approach is general and can be applied for bends with different angles and other similar discontinuities in the CPW. The salient feature of the model is the simplified illustration of frequency dependent effects in the bend. Right-angle, 45 degree, and mitered right-angle bends in the CPW are analyzed, and models are developed for each bend structure. The procedure for extracting the modal scattering matrix from the model is presented. To demonstrate the accuracy of the model, modal transmission coefficients obtained from the model are compared with full-wave electromagnetic simulations. Good agreement between the model and full-wave simulation results over a wide frequency range is demonstrated. The transfer of energy between even and odd modes in the bend is investigated and the effect of the physical properties of the CPW on mode conversion is analyzed in detail. Mode conversion at discontinuities like the bend in CPWs cause non-ideal behavior in the two-port (even-mode) measurements of such circuits. Theoretical prediction of the measured response is discussed along with the predicted response for transmission coefficient from model and full-wave simulations. Comparison between the measurements of a right-angle bend and the corresponding model results shows good agreement. Implementation of the model in SPICE is also discussed.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-05-18T16:48:50Z (GMT) No. of bitstreams: 1 SenguttuvanRajarajan2004.pdf: 9529800 bytes, checksum: f24a4c51af785fbdf7c09ce4987ab57f (MD5)
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