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Determining Q using S parameter data

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2 Author(s)
Drozd, J.M. ; Dept. of Electr. & Comput. Eng., Duke Univ., Durham, NC, USA ; Joines, W.T.

A method is presented for determining frequency selectivity (Q) of a network using scattering (S) parameter data, data that is readily available from network measurements or analysis. The approach is based on a formulation for Q that uses the change in reactance of the resonant circuit with frequency. The method yields accurate Q results for both high and low Q resonators. Furthermore, the method is easy to implement and to understand. An example is given for calculating the Q of a tapped-stub resonator. Using this example, the new method is compared to the critical points (CP) method, an approach based on a Foster network type of formulation

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:44 ,  Issue: 11 )