US3754273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrugated waveguide
Assignee: Mitsubishi Electric Corp
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Filing: 1971-10-15
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Granted: 1973-08-21
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Expires: 1991-10-15
Abstract
Abstract The disclosed circular waveguide is provided on the inner wall surface with corrugated slots each having a width abruptly changed from a smaller value on that portion near to the axis of the waveguide to a larger value on the remaining portion of the slot. Also an electromagnetic horn is disclosed including such slots.
Inventors
- 👤 Y Takeichi
- 👤 T Hashimoto
- 👤 F Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:09
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/02; H01Q13/0208; H01P; H01P3/00; H01P3/12; H01P3/127
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
A section of waveguide comprising cylindrical wall means defining a section of a closed geometric figure, a plurality of annular metallic plates attached to the inner surface of said wall means at predetermined equal intervals along and perpendicularly to the axis of the waveguide to define between them a plurality of slots with the inner surface of said wall means defining the bottom of said slots, said plates having central openings aligned with one another, each of said slots having a width which varies in the direction of the depth thereof for causing said corrugated slots to have capacitive susceptances within a wide frequency band.
Claim 2
Dependent Claim
105 words
A section of waveguide comprising cylindrical wall means defining a section of a closed geometric figure, a plurality of annular metallic plates attached to the inner surface of said wall means at predetermined equal intervals along and perpendicularly to the axis of the waveguide to define between them a plurality of slots with the inner surface of said wall means defining the bottom of said slots, said plates having central openings aligned with one another, each of said slots having a width which varies in the direction of the depth thereof for causing said corrugated slots to have capacitive susceptances within a wide frequency band.
Claim 3
Dependent Claim
17 words
A section of waveguide as claimed in claim 1 having one end portion formed into a horn.
Claim 4
Dependent Claim
27 words
A section of waveguide as claimed in claim 1 wherein each of said slots has a width which varies stepwise transversely of the axis of the waveguide.
Claim 5
Dependent Claim
17 words
A section of waveguide as claimed in claim 3 having one end portion formed into a horn.
Claim 6
Dependent Claim
50 words
A section of waveguide as claimed in claim 1 wherein each of said slots has a widTh which varies stepwise from a smaller value at that portion thereof near the axis of the waveguide to a larger value at that portion thereof near the inner wall surface of the waveguide.
Claim 7
Dependent Claim
17 words
A section of waveguide as claimed in claim 5 having one end portion formed into a horn.
References Cited (Backward Citations)
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US3631502A
Cited
US3527976A
Cited
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Cited
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Cited
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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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |