US 5,311,159 AGranted

Bandpass type filter having tri-plate line resonators

AssigneeTDK Corporation

InventorsTaro Miura, Tadao Fujii, Shinya Nakai

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Abstract

A tri-plate line is constructed from a resonance element formed by intervening dielectrics between one pair of ground conductors (6). The length of the line is adjusted to about 1/4 wave-length. Then, a bandpass filter is formed by combining a plurality of resonators (5) of which one end is grounded. Each of the resonators (5) is separated by separators (9) so that waveguide mode propagation in the tri-plate line is prevented from occurring. A plurality of the tri-plate lines are piled up. The electromagnetic coupling of the resonators in different layers with each other are conducted by means of coupling means (7) formed in the dielectric and the ground conductor. The resonators disposed at both ends are coupled with input/output terminals (1,2), respectively.

Claims34

Dependent claims

A bandpass type filter having a plurality of unit lamination structures in a piled structure, each of the plurality of unit lamination structures incorporates a first dielectric substrate provided with a bottom face to which a first ground conductor is attached, a circuit pattern face formed on a first top face of the first dielectric substrate, and a second dielectric substrate contacted to the first dielectric substrate via said circuit pattern face and provided with a second top face on which a second ground conductor is attached on,

said circuit pattern face having at least one resonance element formed therein with one end of the resonance element grounded to said first and second ground conductors, said filter comprising:
a coupling means for electromagnetically coupling between two resonance elements disposed in different unit lamination structures, said means being formed in corresponding dielectric substrates between said two resonance elements;
each of the unit lamination structures having a separator for electromagnetically separating said at least one resonance element therein and
first and second input/output terminals coupled with the circuit pattern face, said terminals being formed to couple with an external circuit.

1 more element

A bandpass type filter, comprising:

a plurality of unit lamination structures in a piled structure, each of the plurality of unit lamination structures including a first dielectric substrate provided with a bottom face on which a first ground conductor is formed, a second dielectric substrate having a second bottom face contacting a first top face of the first dielectric substrate and a second top face on which a second ground conductor is attached, and a circuit pattern formed between the first top face of the first dielectric substrate and the second bottom face of the second dielectric substrate, wherein
the circuit pattern has a plurality of resonance elements formed therein at predetermined intervals with one end of each of the resonance elements grounded to said first and second ground conductors;
a coupling means for electromagnetically coupling between two resonance elements each located in a different unit lamination structure, said means being formed in corresponding dielectric substrates between the two resonance elements to be coupled;
each of the unit lamination structures having a separator means for electromagnetically separating said plurality of resonance elements therein;
and
first and second input/output terminals coupled with the circuit pattern, said terminals being formed to couple with an external circuit.

3 more elements

Dependencies are inferred from the claim text.