Patent US5065117A successfully refreshed from Google Patents.
US5065117A
Expired / Lapsed
US
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Microwave circuit
Assignee: Sharp Corp
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Filing: 1990-06-05
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Granted: 1991-11-12
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Expires: 2010-06-05
Abstract
Abstract Disclosed is a microwave circuit suitable made into a monolithic microwave integrated circuit (MMIC). This microwave circuit includes a main line comprising a distributed constant line formed on a major surface of a substrate, and a stub connected in parallel with the main line in which lines the characteristics admittance varies discontinuously. Because of the discontinuous variation of the characteristic admittance of the stub, the phase of the characteristic admittance is changed, so that the stub length can be reduced.
Inventors
- 👤 Toshihiko Yoshimasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:28
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/02; H03; H03H; H03H7/00; H03H7/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
A microwave filter circuit having a noise removing frequency band, said filter circuit comprising a substrate; a distributed constant main line being formed on a surface of said substrate and having a characteristic admittance which varies discontinuously at at least one point; a distributed constant stub line being formed on said surface of said substrate and having a characteristic admittance which varies discontinuously at at least one point; one end of said stub line being connected to a selected point on said main line at which the characteristic admittance of the main line varies discontinuously; and another terminal end of said stub line being ungrounded, the characteristic admittance of said stub line at said terminal end being larger than the characteristic admittance of said stub line at said one end thereof.
Claim 2
Dependent Claim
131 words
A microwave filter circuit having a noise removing frequency band, said filter circuit comprising a substrate; a distributed constant main line being formed on a surface of said substrate and having a characteristic admittance which varies discontinuously at at least one point; a distributed constant stub line being formed on said surface of said substrate and having a characteristic admittance which varies discontinuously at at least one point; one end of said stub line being connected to a selected point on said main line at which the characteristic admittance of the main line varies discontinuously; and another terminal end of said stub line being ungrounded, the characteristic admittance of said stub line at said terminal end being larger than the characteristic admittance of said stub line at said one end thereof.
Claim 3
Dependent Claim
25 words
A microwave filter circuit according to claim 1 and further including a capacitor connected between said selected point on said main line and a ground.
Claim 4
Dependent Claim
19 words
A microwave filter circuit according to claim 1 wherein said circuit is formed as a monolithic microwave integrated circuit.
References Cited (Backward Citations)
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Cited
US4525680A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |