Layered transmission line filter with a capacitively coupled electrode in a layer opposing stripline resonators
AssigneeNGK Insulators, Ltd.
InventorsTakami Hirai, Shinsuke Yano
Life of this patent
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Abstract
A compact stripline filter for use in a high frequency circuit for a portable telephone, for example, including an internal ground electrode. The filter includes first resonator having a first main surface, a first ground electrode disposed in an opposed facing relationship to the entire surface of the first main surface of the first resonator, a first dielectric layer interposed between the first main surface of the first resonator and the first ground electrode, and a first internal ground electrode formed in the first dielectric layer and disposed in an opposed facing relationship to a portion of the first main surface of the first resonator.
Claims15
A transmission line filter, comprising:
- a dielectric body;
- a first ground electrode provided on an outer surface of said dielectric body;
- a first resonator disposed in said dielectric body, having an end portion short-circuited to said first ground electrode, an open-circuited end portion, and first and second opposite main surfaces;
- a second resonator disposed in said dielectric body and being inductively coupled to said first resonator, said second resonator having an end portion short-circuited to said first ground electrode, an open-circuited end portion, and first and second opposite main surfaces;
- a first coupling adjusting electrode having a main surface and being disposed in said dielectric body such that said main surface of said first coupling adjusting electrode opposes a portion of said first main surface of said first resonator and a portion of said first main surface of said second resonator.
A transmission line filter, comprising:
- a dielectric body;
- a first ground electrode provided on a first outer surface portion of said dielectric body;
- a first resonator disposed in said dielectric body, having an end portion electrically short-circuited to said first ground electrode, an open-circuited end portion, and a first main surface;
- a second resonator disposed in said dielectric body, being substantially parallel to said first resonator and inductively coupled to said first resonator, said second resonator having an end portion electrically short-circuited to said first ground electrode, an open-circuited end portion, and a first main surface;
- a first coupling adjusting electrode having a main surface and being disposed in said dielectric body such that said main surface of said first coupling adjusting electrode opposes a portion of said first main surface of said first resonator and a portion of said first main surface of said second resonator;
- and
- an internal ground electrode electrically short-circuited to said first ground electrode, disposed in said dielectric body, said internal ground electrode having a main surface which opposes said first resonator at said open-circuited end portion thereof and said second resonator at said open-circuited end portion thereof.
Dependencies are inferred from the claim text.