US4352076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Band pass filters
Assignee: Hitachi Ltd
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Filing: 1980-09-12
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Granted: 1982-09-28
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Expires: 2000-09-12
Abstract
Abstract In a band pass filter of micro strip line structure, an input conductor, an output conductor, a first open end conductor and a second open end conductor are provided. The first and the second open end conductors are located opposite to the input and the output conductors forming narrow gaps between said open end conductors and said input and output conductors. The mutual inductance between the first and the second open end conductors is adjusted by selecting the width of the gap between the first and the second open end conductors.
Inventors
- 👤 Takeshi Saitoh
- 👤 Hiroshi Hatashita
- 👤 Toshio Nagashima
- 👤 Susumu Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:34
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20354; H01P1/20381
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A band pass filter consisting of a micro strip line structure, characterized in that a first open end conductor and a second open end conductor are arranged in parallel, the length of each of said first and second open end conductors being approximately equal to one half of the wave length of the band pass frequency, and an input conductor and an output conductor are arranged opposite to the same side ends of said first and second open end conductors, respectively, forming narrow gaps between said first and second open end conductors, and said input and output conductors, respectively.
Claim 2
Dependent Claim
99 words
A band pass filter consisting of a micro strip line structure, characterized in that a first open end conductor and a second open end conductor are arranged in parallel, the length of each of said first and second open end conductors being approximately equal to one half of the wave length of the band pass frequency, and an input conductor and an output conductor are arranged opposite to the same side ends of said first and second open end conductors, respectively, forming narrow gaps between said first and second open end conductors, and said input and output conductors, respectively.
Claim 3
Dependent Claim
44 words
A band pass filter as defined in claim 1, wherein said input and output conductors are located in close proximity forming a gap therebetween the width of which is smaller than the width of the gap between said first and second open end conductors.
Claim 4
Dependent Claim
27 words
A band pass filter as defined in claim 1 or 2, wherein a third open end conductor is arranged between said first and second open end conductors.
Claim 5
Dependent Claim
23 words
A band pass filter as defined in claim 3, wherein each of said first and second open end conductors has a rectangular shape.
Claim 6
Dependent Claim
25 words
A band pass filter as defined in claim 1 or 2, wherein each of said first and second open end conductors has a rectangular shape.
References Cited (Backward Citations)
US3796970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |