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US 4,283,697 AGranted
High frequency filter
AssigneeOki Electric Industry Co., Ltd.
InventorsYoshio Masuda, Atsushi Fukasawa, Jun Ashiwa, Takuro Sato
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AssigneeOki Electric Industry Co., Ltd.
InventorsYoshio Masuda, Atsushi Fukasawa, Jun Ashiwa, Takuro Sato
Estimating the term…
A high frequency filter for frequencies higher than the VHF band comprises a closed conductive housing, a pair of input and/or output means like an antenna provided at both the extreme ends of said housing, a plurality of resonators arranged on a straight line between said antennas, each of said resonators having an elongated inner conductor and a cylindrical dielectric body surrounding said inner conductor, one end of each of said resonators being fixed on the single plane of the housing and the other end of each of said resonators being free standing, and the length between each of the resonators being defined according to the specified coupling coefficient for the desired characteristics of the filter. The present filter utilizes the coupling effect between resonators by the displacement current relating to surface TM mode and the conductive current relating to TEM mode. Therefore, no coupling means for providing the coupling between resonators is provided.
A high frequency filter comprising a closed conductive housing, a pair of input/output means provided at both the extreme ends of said housing, a plurality of resonators mounted in said housing on a straight line between said input/output means, and one end of all of said resonators being fixed on the single conductive plane of said housing and the other end of said resonators being free standing, wherein each resonator comprises a center conductor and a dielectric body surrounding said center conductor, and wherein the outer surface of the dielectric body is substantially disposed in the air so that a displacement current on the surface of the dielectric body can flow, the separation between each of said resonators is determined according to the desired coupling coefficient for the filter, and the coupling between each resonators is effected by the displacement current relating to surface TM mode and the conductive current relating to TEM mode.
Dependencies are inferred from the claim text.