Patent US4293830A successfully refreshed from Google Patents.
US4293830A
Expired / Lapsed
US
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Microstrip delay line compensated for thermal phase variations
Assignee: Telecom Italia SpA
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Filing: 1979-10-23
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Granted: 1981-10-06
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Expires: 1999-10-23
Abstract
Abstract A delay line for microwaves, whose transfer function is subject to phase variations with changes in ambient temperature, is connected in cascade with a transmission line whose phase varies in the opposite sense. The transmission line, which may be integrated with the associated delay line in a common microstrip structure, is of such length as to maintain the overall phase shift substantially constant within a certain temperature range.
Inventors
- 👤 Luciano Accatino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:00
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A method of transmitting microwaves along a signal path with a substantially temperature-independent phase shift within a predetermined temperature range, comprising the steps of cascading a microstrip delay line having a first thermal coefficient of dielectric-constant variation with a microstrip transmission line having a second thermal coefficient of dielectric-constant variation of a sign opposite that of said first thermal coefficient, and making said transmission line of a length substantially compensating for thermal phase variations of said delay line within said predetermined temperature range.
Claim 2
Independent Claim
83 words
A method of transmitting microwaves along a signal path with a substantially temperature-independent phase shift within a predetermined temperature range, comprising the steps of cascading a microstrip delay line having a first thermal coefficient of dielectric-constant variation with a microstrip transmission line having a second thermal coefficient of dielectric-constant variation of a sign opposite that of said first thermal coefficient, and making said transmission line of a length substantially compensating for thermal phase variations of said delay line within said predetermined temperature range.
Claim 3
Independent Claim
90 words
A device for transmitting microwaves between an input terminal and an output terminal with a substantially temperature-independent phase shift within a predetermined temperature range, comprising a microstrip delay line connected to said input terminal and a microstrip transmission line connected in cascade with said delay line to said output terminal, said delay line and said transmission line having thermal coefficients of dielectric-constant variation which are of mutually opposite sign, said transmission line having a length substantially compensating for thermal phase variations of said delay line within said predetermined temperature range.
Claim 4
Independent Claim
90 words
A device for transmitting microwaves between an input terminal and an output terminal with a substantially temperature-independent phase shift within a predetermined temperature range, comprising a microstrip delay line connected to said input terminal and a microstrip transmission line connected in cascade with said delay line to said output terminal, said delay line and said transmission line having thermal coefficients of dielectric-constant variation which are of mutually opposite sign, said transmission line having a length substantially compensating for thermal phase variations of said delay line within said predetermined temperature range.
Claim 5
Dependent Claim
21 words
A device as defined in claim 2 wherein said delay line and said transmission line are structurally integrated with each other.
Claim 6
Dependent Claim
16 words
A device as defined in claim 2 or 3 wherein said delay line incorporates filter means.
Claim 7
Dependent Claim
23 words
A device as defined in claim 4 wherein said delay line and said transmission line comprise substrates of quartz and of titanate, respectively.
References Cited (Backward Citations)
US2779004A
Cited
US3617955A
Cited
US3886484A
Cited
US4019161A
Cited
US4059815A
Cited
US4112398A
Cited
US4208640A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |