Patent US3466964A successfully refreshed from Google Patents.
Patent US3729692A successfully refreshed from Google Patents.
US3729692A
Expired / Lapsed
US
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Microwave circulator circuits
Assignee: Hitachi Ltd
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Filing: 1971-07-08
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Granted: 1973-04-24
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Expires: 1991-07-08
Abstract
Abstract The microwave circulator circuit comprises two circulators of the same characteristic each having three terminals and three 3dB directional couplers each having four terminals. Three pairs of terminals, each pair consisting of corresponding ones of the terminals of the two circulators, are connected with the three pairs of terminals, each pair consisting of two terminals of particular one of the four-terminal couplers so as to form a sixterminal composite circulator.
Inventors
- 👤 M Tanaka
- 👤 A Honda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:47
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/32; H01P1/38; H01P1/383; H01P1/387; G; G01; G01S; G01S7/00; G01S7/02; G01S7/03; G01S7/034
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
A microwave circulator circuit comprising two circulators of the same characteristic each having three terminals, the corresponding ones of said terminals of respective said circulators forming three pairs of terminals, three 3dB directional couplers each having four terminals, the two terminals of each pair of said three pairs of terminals being connected respectively with two terminals of relevant ones of said directional couplers, the remaining six terminals of said directional couplers being input and output terminals.
Claim 2
Dependent Claim
76 words
A microwave circulator circuit comprising two circulators of the same characteristic each having three terminals, the corresponding ones of said terminals of respective said circulators forming three pairs of terminals, three 3dB directional couplers each having four terminals, the two terminals of each pair of said three pairs of terminals being connected respectively with two terminals of relevant ones of said directional couplers, the remaining six terminals of said directional couplers being input and output terminals.
Claim 3
Dependent Claim
38 words
A microwave circulator circuit as claimed in claim 1, wherein each of said directional couplers consists of a rat race having four terminals and a quadrature-phase shifter connected with one of the four terminals of said rat race.
Claim 4
Dependent Claim
22 words
A microwave circulator circuit as claimed in claim 1, wherein both said circulators and said directional couplers are constructed with microstrip lines.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |