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The resonance frequencies and the fields of a microstrip double-ring resonator are discussed. It is shown that no pure even or odd mode can be excited on the resonator. Therefore it is concluded that the rnicrostrip double-ring resonator principally cannot be used to measure the phase velocities of the even and the odd modes on a coupled microstrip line.
Microwave Theory and Techniques, IEEE Transactions on (Volume:23 , Issue: 5 )
Date of Publication: May 1975