Coupling parameters for a side-coupled ring resonator and a microstrip line

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作者：
Univ of Cincinnati, Cincinnati, United States [1 ]
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来源：
IEEE Trans Microwave Theory Tech | / 6卷 / 953-956期
关键词：
Approximation theory - Calculations - Circuit theory - Electric impedance - Mathematical models - Microstrip lines - Natural frequencies - Permittivity - Piecewise linear techniques - Resonators - Transmission line theory;
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摘要：
A ring resonator side coupled to a microstrip line shows two close but distinct resonance peaks. These are identified as due to even-mode (magnetic field) and odd-mode (electric field) coupling. Equivalent circuit models for both cases have been proposed and coupling parameters are calculated using piecewise, coupled-line approximations. The calculated coupling coefficients for the two cases are compared with the experimentally-measured coupling coefficients and show very good agreement with the models used.
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