Described are tunable high temperature superconducting band-pass and band-reject filters having broad tuning frequency range without performance deterioration, as well as high temperature superconducting filter circuits for use therein.

 
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< Magnetic ferrite microwave resonator frequency adjuster and tunable filter

< Filter circuit and a superconducting filter circuit

> Filter device having spiral resonators connected by a linear section

> Ferroelectric devices and method relating thereto
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