US3715555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circular waveguide microwave applicator
Assignee: Individual
•
Filing: 1972-04-19
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Granted: 1973-02-06
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Expires: 1992-04-19
Abstract
Abstract A circular waveguide microwave applicator is excited in either the TM01 mode or the TE11 mode by means of a hybrid input network receiving energy from a source of microwave power. The material being heated may be conveyed under gravity axially through the circular applicator and along the axis thereof, guided by a dielectric tube extending coaxially with the cylindrical side wall of the applicator. Remnant power is then conducted to terminating water loads connected to the applicator.
Inventors
- 👤 R Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:21
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/78; H01; H01P; H01P1/00; H01P1/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
A system for applying microwave energy to a product comprising: a rectangular hybrid input feed network excited in the TE10 mode and having a sum input port, a difference input port, and first and second output ports; a cylindrical waveguide applicator elongated in an axial direction and having a radius, a, large enough to propagate the circular TM01 mode and small enough to suppress higher order modes; a pair of rectangular coupling waveguides of equal transmission length and coupling respectively said first and second output ports of said hybrid tee network to diagonally opposite locations of said cylindrical waveguide to excite the same either in the TM01 mode or the TE11 mode; and means for passing a material to be treated through the axis of said cylindrical waveguide.
Claim 2
Independent Claim
128 words
A system for applying microwave energy to a product comprising: a rectangular hybrid input feed network excited in the TE10 mode and having a sum input port, a difference input port, and first and second output ports; a cylindrical waveguide applicator elongated in an axial direction and having a radius, a, large enough to propagate the circular TM01 mode and small enough to suppress higher order modes; a pair of rectangular coupling waveguides of equal transmission length and coupling respectively said first and second output ports of said hybrid tee network to diagonally opposite locations of said cylindrical waveguide to excite the same either in the TM01 mode or the TE11 mode; and means for passing a material to be treated through the axis of said cylindrical waveguide.
Claim 3
Independent Claim
128 words
A system for applying microwave energy to a product comprising: a rectangular hybrid input feed network excited in the TE10 mode and having a sum input port, a difference input port, and first and second output ports; a cylindrical waveguide applicator elongated in an axial direction and having a radius, a, large enough to propagate the circular TM01 mode and small enough to suppress higher order modes; a pair of rectangular coupling waveguides of equal transmission length and coupling respectively said first and second output ports of said hybrid tee network to diagonally opposite locations of said cylindrical waveguide to excite the same either in the TM01 mode or the TE11 mode; and means for passing a material to be treated through the axis of said cylindrical waveguide.
Claim 4
Independent Claim
128 words
A system for applying microwave energy to a product comprising: a rectangular hybrid input feed network excited in the TE10 mode and having a sum input port, a difference input port, and first and second output ports; a cylindrical waveguide applicator elongated in an axial direction and having a radius, a, large enough to propagate the circular TM01 mode and small enough to suppress higher order modes; a pair of rectangular coupling waveguides of equal transmission length and coupling respectively said first and second output ports of said hybrid tee network to diagonally opposite locations of said cylindrical waveguide to excite the same either in the TM01 mode or the TE11 mode; and means for passing a material to be treated through the axis of said cylindrical waveguide.
Claim 5
Dependent Claim
71 words
The system of claim 1 wherein the sum input port of said hybrid tee network is excited by a source of microwave energy in the TE10 mode, whereby said cylindrical waveguide is excited in the TM01 mode, and wherein said means for conveying said product includes a dielectric tube extending coaxially with the cylindrical side wall of said cylindrical waveguide for conveying the product in a neighborhood surrounding the axis thereof.
Claim 6
Dependent Claim
26 words
The system of claim 1 wherein said cylindrical waveguide further includes diametrically opposite axially elongated slots adapted to convey sheet material transverse of the axis thereof.
Claim 7
Dependent Claim
29 words
The system of claim 1 further comprising output termination waveguide means for coupling remnant microwave energy passing through said circular waveguide to a terminating load to absorb the same.
Claim 8
Dependent Claim
70 words
The systeM of claim 1 wherein said cylindrical waveguide comprises first and second endplates, said pair of rectangular coupling waveguides being located adjacent said first endplate, said system further comprising a shorting plate interposed between said first endplate and said rectangular waveguides; and means for adjusting said shorting plate axially of said cylindrical waveguide for reflecting power along said cylindrical waveguide while minimizing reflection to said source of microwave energy.
Claim 9
Dependent Claim
34 words
The system of claim 5 further comprising symmetrical tuner means in each of said rectangular coupling waveguides for matching the output impedance of said coupling waveguides to the input impedance of said cylindrical waveguide.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |