Patent US3904991A successfully refreshed from Google Patents.
US3904991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stripline directional coupler having bent coupling arms
Assignee: Toshiba Corp
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Filing: 1974-01-31
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Granted: 1975-09-09
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Expires: 1994-01-31
Abstract
Abstract A coupled line type directional coupler comprises a first directional coupling unit including mutually insulated first and second metal strip lines having a length of lambda /4 which are crossed three-dimensionally at the center of the directional coupling unit and run parallel to each other, the first and second metal strip lines being bent substantially at a right angle and substantially at the center of the first directional coupling unit; and a second directional coupling unit including mutually insulated third and fourth metal strip lines having a length of lambda /4 which are crossed three-dimensionally at the center of the directional coupling unit and run parallel to each other, the third and fourth strip lines being bent substantially at the center of the second directional coupling unit, whereby the first and second directional coupling units are directly coupled in tandem.
Inventors
- 👤 Takimi Ishii
- 👤 Isao Suzuki
- 👤 Torao Nagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:20
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12; H01P5/16; H01P5/18; H01P5/184; H01P5/185
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
175 words
A directional coupler comprising a first directional coupling unit including mutually insulated first and second strip lines having a length of lambda /4 where lambda is the wavelength of the handled signal which are crossed at one portion and run parallel to each other at the remaining portion, the first and second strips being bent, a second directional coupling unit including mutually insulated third and fourth strip lines having a length of lambda /4 which are crossed at one portion and run parallel to each other at the other portion, the third and fourth strip lines being bent so that the respective both ends of the first and second strip lines are opposite to the respective both ends of the third and fourth strip lines, the first and second directional coupling units being directly coupled in tandem, the first and second lines being bent substantially at a right angle and crossed at the center thereof and the third and fourth strip lines being bent substantially at a right angle and crossed at the center thereof.
Claim 2
Dependent Claim
175 words
A directional coupler comprising a first directional coupling unit including mutually insulated first and second strip lines having a length of lambda /4 where lambda is the wavelength of the handled signal which are crossed at one portion and run parallel to each other at the remaining portion, the first and second strips being bent, a second directional coupling unit including mutually insulated third and fourth strip lines having a length of lambda /4 which are crossed at one portion and run parallel to each other at the other portion, the third and fourth strip lines being bent so that the respective both ends of the first and second strip lines are opposite to the respective both ends of the third and fourth strip lines, the first and second directional coupling units being directly coupled in tandem, the first and second lines being bent substantially at a right angle and crossed at the center thereof and the third and fourth strip lines being bent substantially at a right angle and crossed at the center thereof.
Claim 3
Dependent Claim
174 words
A directional coupler comprising a first directional coupling unit including mutually insulated first and second strip lines having a length of lambda /4 where lambda is the wavelength of the handled signal which are crossed at one portion and run parallel to each other at the remaining portion, the first and second strips being bent, a second directional coupling unit including mutually insulated third and fourth strip lines having a length of lambda /4 which are crossed at one portion and run parallel to each other at the other portion, the third and fourth strip lines being bent so that the respective both ends of the first and second strip lines are opposite to the respective both ends of the third and fourth strip lines, the first and second directional coupling units being directly coupled in tandem, the first and second strip lines being bent in a semi-circular shape and crossed at the center thereof and the third and fourth strip lines being bent in a semi-circular shape and crossed at the center thereof.
Claim 4
Dependent Claim
174 words
A directional coupler comprising a first directional coupling unit including mutually insulated first and second strip lines having a length of lambda /4 where lambda is the wavelength of the handled signal which are crossed at one portion and run parallel to each other at the remaining portion, the first and second strips being bent, a second directional coupling unit including mutually insulated third and fourth strip lines having a length of lambda /4 which are crossed at one portion and run parallel to each other at the other portion, the third and fourth strip lines being bent so that the respective both ends of the first and second strip lines are opposite to the respective both ends of the third and fourth strip lines, the first and second directional coupling units being directly coupled in tandem, the first and second strip lines being bent in a semi-circular shape and crossed at the center thereof and the third and fourth strip lines being bent in a semi-circular shape and crossed at the center thereof.
References Cited (Backward Citations)
US3167727A
Cited
US3737810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |