US3851131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multimode microwave cavities for microwave heating systems
Assignee: University of Alberta
•
Filing: 1973-06-28
•
Granted: 1974-11-26
•
Expires: 1993-06-28
Abstract
Abstract The present invention pertains to a new, smaller multimode cavity which may be used as a threadline heater fed by a variety of coupling structures or it may be used to advantage as a means for coupling energy to a larger cavity. The cavity consists of four side walls and two end walls with a number of spaced metallic vanes placed within the cavity transverse to the desired electric field forming a multimode cavity having a number of small resonators which may be tuned in any conventional manner such as by simple bolt.
Inventors
- 👤 D Johnston
- 👤 W Voss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:16
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/80
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A multimode microwave applicator comprising: a cavity having two pairs of parallel side walls and parallel end walls; a coupling structure connected to a transmission line and mounted through a firsT one of said walls for providing power to said cavity; a number of spaced metallic vanes mounted within the cavity transverse to the electric field, forming resonators within said cavity; and a second one of said walls consisting of a slotted array coupled to a further cavity.
Claim 2
Dependent Claim
78 words
A multimode microwave applicator comprising: a cavity having two pairs of parallel side walls and parallel end walls; a coupling structure connected to a transmission line and mounted through a firsT one of said walls for providing power to said cavity; a number of spaced metallic vanes mounted within the cavity transverse to the electric field, forming resonators within said cavity; and a second one of said walls consisting of a slotted array coupled to a further cavity.
Claim 3
Dependent Claim
102 words
A multimode microwave applicator comprising: a cavity having two pairs of parallel side walls and parallel end walls; and a coupling structure to provide power to the cavity through one of said walls, said coupling structure including a square wave shaped conductor mounted within the cavity in spaced relationship to said one wall and connected to a coaxial transmission line to conduct power to said conductor, and, a perforated metallic plate mounted within the cavity in spaced relationship to said conductor; and a number of spaced metallic vanes mounted within the cavity transverse to the electric field forming resonators within said cavity.
Claim 4
Dependent Claim
102 words
A multimode microwave applicator comprising: a cavity having two pairs of parallel side walls and parallel end walls; and a coupling structure to provide power to the cavity through one of said walls, said coupling structure including a square wave shaped conductor mounted within the cavity in spaced relationship to said one wall and connected to a coaxial transmission line to conduct power to said conductor, and, a perforated metallic plate mounted within the cavity in spaced relationship to said conductor; and a number of spaced metallic vanes mounted within the cavity transverse to the electric field forming resonators within said cavity.
Claim 5
Dependent Claim
91 words
A multimode microwave applicator comprising: a cavity having two pairs of parallel side walls and parallel end walls; a coupling structure adapted to be connected to a transmission line, said coupling structure including a chamber mounted on one wall of said cavity with metallic vanes mounted within the chamber to form reversing sections of rectangular waveguide and openings in the walls of said waveguide to couple power to said cavity; and a number of spaced metallic vanes mounted within the cavity transverse to the electric field forming resonators within said cavity.
Claim 6
Dependent Claim
91 words
A multimode microwave applicator comprising: a cavity having two pairs of parallel side walls and parallel end walls; a coupling structure adapted to be connected to a transmission line, said coupling structure including a chamber mounted on one wall of said cavity with metallic vanes mounted within the chamber to form reversing sections of rectangular waveguide and openings in the walls of said waveguide to couple power to said cavity; and a number of spaced metallic vanes mounted within the cavity transverse to the electric field forming resonators within said cavity.
Claim 7
Dependent Claim
81 words
A multimode microwave applicator comprising: a cavity having two pairs of parallel side walls and parallel end walls; and a coupling structure to provide power to the cavity through one of said walls, said coupling structure including a square wave shaped conductor mounted within the cavity in spaced relationship to said one wall and connected to a coaxial transmission line to conduct power to said conductor, and a perforated metallic plate mounted within the cavity in spaced relationship to said conductor.
Claim 8
Dependent Claim
81 words
A multimode microwave applicator comprising: a cavity having two pairs of parallel side walls and parallel end walls; and a coupling structure to provide power to the cavity through one of said walls, said coupling structure including a square wave shaped conductor mounted within the cavity in spaced relationship to said one wall and connected to a coaxial transmission line to conduct power to said conductor, and a perforated metallic plate mounted within the cavity in spaced relationship to said conductor.
Claim 9
Dependent Claim
71 words
A multimode microwave applicator comprising: a cavity having two pairs of parallel side walls and parallel end walls; and a coupling structure adapted to be connected to a transmission line, said coupling structure having a chamber mounted on one wall of said cavity with metallic vanes mounted within the chamber to form reversing sections of rectangular waveguide and openings in the walls of said waveguide to couple power to said cavity.
Claim 10
Dependent Claim
71 words
A multimode microwave applicator comprising: a cavity having two pairs of parallel side walls and parallel end walls; and a coupling structure adapted to be connected to a transmission line, said coupling structure having a chamber mounted on one wall of said cavity with metallic vanes mounted within the chamber to form reversing sections of rectangular waveguide and openings in the walls of said waveguide to couple power to said cavity.
References Cited (Backward Citations)
US2637001A
Cited
US1910147A
Cited
US2521993A
Cited
US2931992A
Cited
US3221132A
Cited
FR1471131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |