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It is shown that two degenerate modes can be excited on a microstrip ring resonator. These modes can be used to realise a double-tuned circuit bandpass filter in microstrip technique.
The resonance frequencies of a coaxial ferrite-filled cavity and the field distribution in the cavity are calculated. There are three different groups of modes to be distinguished: the limit-TEM mode, the EH and HE modes, and modes independent of the zco-ordinate, which are TM modes. The eigenvalue equation for all modes is derived and discussed.
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