US5014024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bandpass filter and method of trimming response characteristics thereof
Assignee: Niterra Co Ltd
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Filing: 1990-07-27
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Granted: 1991-05-07
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Expires: 2010-07-27
Abstract
Abstract A bandpass filter is disclosed which comprises a pair of opposing, first and second dielectric substrates each having an outer surface provided with a ground conductor, and a conducting resonator member provided between the first and second dielectric substrates and including a plurality of parallel resonator fingers each having an open circuit end and a base end electrically connected to said ground conductor, characterized in that a part of the ground conductor is removed to form an opening therein between adjacent two fingers, thereby to increase the bandwidth of frequency to which the filter responds.
Inventors
- 👤 Hiroyuki Shimizu
- 👤 Kenji Ito
- 👤 Naomasa Wakita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:34
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20336; H01P1/20345
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A bandpass filter comprising a pair of opposing, first and second dielectric substrates each having an outer surface provided with a ground conductor, and conducting resonator means provided between said first and second dielectric substrates and including a plurality of parallel resonator fingers each having an open circuit end and a base end electrically connected to said ground conductor, characterized in that a part of said ground conductor is removed to form an opening therein between adjacent two fingers, thereby to increase the bandwidth of frequency to which said filter responds.
Claim 2
Dependent Claim
91 words
A bandpass filter comprising a pair of opposing, first and second dielectric substrates each having an outer surface provided with a ground conductor, and conducting resonator means provided between said first and second dielectric substrates and including a plurality of parallel resonator fingers each having an open circuit end and a base end electrically connected to said ground conductor, characterized in that a part of said ground conductor is removed to form an opening therein between adjacent two fingers, thereby to increase the bandwidth of frequency to which said filter responds.
Claim 3
Dependent Claim
61 words
A bandpass filter according to claim 1, wherein said resonator means has three resonator fingers including two, side resonator fingers and an intermediate resonator finger disposed between said side resonator fingers and wherein said opening is formed adjacent to the open circuit end of said intermediate resonator finger on at least one of the both sides of said intermediate resonator finger.
Claim 4
Dependent Claim
17 words
A bandpass filter according to claim 2, wherein said resonator fingers are arranged in a interdigital form.
Claim 5
Independent Claim
95 words
A method of trimming the response characteristics of a bandpass filter comprising a pair of opposing, first and second dielectric substrates each having an outer surface provided with a ground conductor, and conducting resonator means provided between said first and second dielectric substrates and including a plurality of parallel resonator fingers each having an open circuit end and a base end electrically connected to said ground conductor, characterized by the step of removing a portion of said ground conductor between adjacent two resonator fingers to increase the bandwidth of frequency to which said filter responds.
Claim 6
Independent Claim
95 words
A method of trimming the response characteristics of a bandpass filter comprising a pair of opposing, first and second dielectric substrates each having an outer surface provided with a ground conductor, and conducting resonator means provided between said first and second dielectric substrates and including a plurality of parallel resonator fingers each having an open circuit end and a base end electrically connected to said ground conductor, characterized by the step of removing a portion of said ground conductor between adjacent two resonator fingers to increase the bandwidth of frequency to which said filter responds.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |