Dielectric filter
January 15, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDistribution constant filter with suppression of TE11 resonance mode Single-block dual-passband ceramic filter useable with a transceiver Di-electric bandpass filter Ceramic block filter with co-fired coupling pins Dielectric filter having variable rectangular cross section inner conductors Dielectric filter and mounting bracket assembly Multi-stage monolithic ceramic bandstop filter with isolated filter stages Dielectric filer having a decoupling aperture between coaxial resonators Dielectric multi-line resonator including a coupling conductor line mainly inductively coupled to a resonator conductor line Multi-passband dielectric filter construction having a filter portion including at least a pair of dissimilarly-sized resonators InventorsAssigneeApplicationNo. 783074 filed on 01/15/1997US Classes:333/206, Coaxial333/134Utilizing long line elementExaminersPrimary: Ham, SeungsookAttorney, Agent or FirmForeign Patent References
International ClassesH01P 1/2/02.5/12 Foreign Application Priority Data1994-06-16 JPAbstractA dielectric filter is provided which permits one to obtain desired external coupling easily without lowering Qo of resonators. The filter comprises a dielectric block having an open end surface and a shorted end surface and provided with resonator holes. Excitation holes are formed in the block outside the resonator holes, respectively. Input/output electrodes are formed on the open end-surface. The electrodes are electrically connected with conductors formed inside the excitation holes but isolated from an outer conductor. The conductors inside the excitation holes are electrically connected with the outer conductor on the shorted end surface. The excitation holes are electromagnetically coupled to the respective adjacent resonator holes, thus providing external coupling.Other References
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