A resonator for use in a radio frequency filter including a substantially planar resonant portion that is substantially elliptical in plan. The resonant portion is mounted on a dielectric substrate. The resonator is configured to operate in at least a mode in which resonance occurs with a radial current and with substantially no current along the edge of the resonant portion. A filter comprising a plurality of the resonators is also disclosed.

 
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< High temperature superconducting tunable filter

< Resonator, filter, duplexer, composite filter device, transmission-reception device, and communication device

> Method and apparatus for minimizing intermodulation with an asymmetric resonator

> Low-temperature high-frequency amplifying apparatus and wireless apparatus
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