EP0506476A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Dielectric filter having coupling electrodes for connecting resonator electrodes, and method of adjusting frequency characteristic of the filter
Assignee: NGK Insulators Ltd
•
Filing: 1992-03-27
•
Granted: —
•
Expires: 2012-03-27
Abstract
Abstract A tri-plate type dielectric filter having a dielectric substrate (24, 30, 32), a plurality of resonator electrodes (18) embedded in the substrate, and coupling electrodes (22, 26) formed within the dielectric substrate, for electrically connecting the resonator electrodes, so as to provide capacitors (36, 38) each between adjacent ones of the resonator electrodes. The resonator electrodes may take the form of parallel elongate strips each providing a stripline type λ/4 or λ/2 TEM mode resonance circuit. One end of each strip is exposed on an outer surface of the substrate (30, 32). This end of each strip is trimmed to adjust the resonance frequency of the resonance circuit.
Inventors
- 👤 Takami Hirai
- 👤 Shinsuke Yano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 14:54
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20336; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24777; Y10T428/24802; Y10T428/24917
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
63 words
A tri-plate type dielectric filter having a dielectric substrate (24; 30, 32; 44, 46, 48, 50) and a plurality of resonator electrodes (18) embedded in said substrate, characterized in that coupling electrodes (22, 26) are formed within said dielectric substrate, for electrically connecting said plurality of resonator electrodes, so as to provide capacitors (36, 38) each between adjacent ones of said resonator electrodes.
Claim 2
Dependent Claim
52 words
A tri-plate type dielectric filter according to claim 1, wherein a ground conductor (14, 14a) is provided on a first outer surface of said dielectric substrate (24; 30, 32; 44, 46, 48, 50), and said plurality of resonator electrodes (18) have short-circuited first ends connected to each other by said ground conductor.
Claim 3
Dependent Claim
35 words
A tri-plate type dielectric filter according to claim 2, wherein said plurality of resonator electrodes (18) consist of a plurality of elongate strips, respectively, said elongate strips being formed substantially in parallel with each other.
Claim 4
Dependent Claim
46 words
A tri-plate type dielectric filter according to claim 2, wherein each of said resonator electrodes (18) has a second end opposite to said short-circuit first end thereof, said coupling electrodes (22, 26) including coupling electrodes (22) formed integrally with said second ends of said resonator electrodes.
Claim 5
Dependent Claim
31 words
A tri-plate type dielectric filter according to claim 4, wherein said coupling electrodes (22, 26) include a coupling electrode (26) for connecting said two outermost electrodes of said resonator electrodes (18).
Claim 6
Dependent Claim
50 words
A tri-plate type dielectric filter according to claim 2, wherein each of said resonator electrodes (18) provides a stripline type λ/4 or λ/2 TEM mode resonance circuit, and has a second end which is exposed on a second outer surface of said dielectric substrate (30, 32; 44, 46, 48, 50).
Claim 7
Dependent Claim
57 words
A tri-plate type dielectric filter according to claim 6, wherein said coupling electrodes (22) correspond to said resonator electrodes (18), respectively, said exposed second end of each said resonator electrodes (18) being spaced from a corresponding one of said coupling electrodes (22), in a direction of thickness of said dielectric substrate (30, 32; 44, 46, 48, 50).
Claim 8
Dependent Claim
96 words
A tri-plate type dielectric filter according to claim 6, wherein said ground conductor (14, 14a) includes a top and a bottom conductive films (14) formed on opposite top and bottom surfaces as said first outer surface of said dielectric substrate (44, 46, 48, 50), respectively, and a plurality of conductive strips (14a) formed on a side surface as said second outer surface of said dielectric substrate, so as to electrically connect said top and bottom conductive films (14), such that said second ends of said resonator electrodes (18) are electrically insulated from said conductive strips (14a).
Claim 9
Dependent Claim
45 words
A method of adjusting a frequency characteristic of a tri-plate type dielectric filter as defined in claim 6, characterized by comprising the step of trimming said second end of each said resonator electrodes (18), to thereby adjust a resonance frequency of the corresponding resonance circuit.
References Cited (Backward Citations)
US3512110A
Cited
US4418324A
Cited
US4673902A
Cited
EP0346672A2
Cited
US4963843A
Cited
EP0414619A2
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.