Patent US3745487A successfully refreshed from Google Patents.
US3745487A
Expired / Lapsed
US
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Microwave phase-shift devices of the o-pi type
Assignee: Thales SA
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Filing: 1971-10-18
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Granted: 1973-07-10
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Expires: 1991-10-18
Abstract
Abstract A O - pi microwave phase-shift device for operation in a wide frequency band, is provided. The device, connected to one end of a two-wire microwave propagation line, comprises a filter Fm followed by a semiconductor diode. The filter Fm is a series m-derived half-section low-pass filter derived from the half-section low-pass filter circuit equivalent to the diode end its output connections, the diode being reverse-biased.
Inventors
- 👤 R Milard
- 👤 C Hubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:56
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/18; H01P1/185
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
A microwave phase-shift device of the O- pi type, For connection to one end of a two-conductor microwave propagation line, comprising : two terminals respectively connected to said conductors at said one end ; a series m-derived half-section low-pass filter comprising a shunt arm and a series arm, said shunt arm being connected across said terminals and said series arm being connected to one of said terminals ; a half-section low-pass filter, comprising a series arm connected in series with said first mentioned series arm and a shunt arm connected between said second mentioned series arm and the other of said terminals, the capacity of said second mentioned shunt arm being that of a reversely biased diode ; and control means for selectively switching said diode from reverse to direct state and conversely.
Claim 2
Dependent Claim
133 words
A microwave phase-shift device of the O- pi type, For connection to one end of a two-conductor microwave propagation line, comprising : two terminals respectively connected to said conductors at said one end ; a series m-derived half-section low-pass filter comprising a shunt arm and a series arm, said shunt arm being connected across said terminals and said series arm being connected to one of said terminals ; a half-section low-pass filter, comprising a series arm connected in series with said first mentioned series arm and a shunt arm connected between said second mentioned series arm and the other of said terminals, the capacity of said second mentioned shunt arm being that of a reversely biased diode ; and control means for selectively switching said diode from reverse to direct state and conversely.
Claim 3
Dependent Claim
71 words
A microwave phase-shift device as claimed in claim 1, wherein said diode and the capacity in the shunt arm of said m-derived low-pass filter are in the form of respective pills having two opposite metallized faces each of said pills being connected by a first metallized face directly to a first one of said conductors and a lead, connecting the second metallized face to the second conductor of said propagation line.
Claim 4
Dependent Claim
59 words
A microwave phase-shift device as claimed in claim 2, wherein said propagation line is an element of the ''''microstrip'''' line type, said first conductor corresponding to the strip and said second conductor to the ground plane, and wherein a cylindrical conductor stud, located in an opening formed transversely through said microstrip line, connects said leads to said ground plane.
Claim 5
Dependent Claim
56 words
A microwave phase-shift device as claimed in claim 2, wherein said microwave propagation line is an element of the coaxial line type, said first conductor corresponding to the external coaxial conductor and said second conductor to the central coaxial conductor and wherein a removable sealed-capsule housing accommodates said coaxial line element and said pills and leads.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |