US4211911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave directional coupler and detector module
Assignee: General Electric Co
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Filing: 1979-01-16
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Granted: 1980-07-08
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Expires: 1999-01-16
Abstract
Abstract A module board comprised of a microstrip transmission line, terminating resistors and detectors is mounted over two coupling apertures spaced one quarter guide wavelength along a rectangular waveguide. The microstrip line has a length of five quarters of a wavelength as measured in the secondary line system. Output signals representing forward and reflected power flow in the waveguide are developed by the two detectors. This power sensor is low cost and compact and is suitable for a microwave oven.
Inventors
- 👤 Rudolph A. Dehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:07
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/70; H05B6/707; G; G01; G01R; G01R1/00; G01R1/20; G01R1/24; G01R21/00; G01R21/10; G01R21/12; H05B6/6447; H05B6/66; H05B6/68; H05B6/688; H05B6/705; Y; Y02; Y02B; Y02B40/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
152 words
A directional coupler and detector in combination with wavewguide through which microwave energy propagates from a source to a load and vice versa and which has a pair of coupling apertures in one wall that are spaced apart in the direction of wave propagation one quarter wavelength as measured in the waveguide system; said directional coupler and detector comprising a secondary transverse electromagnetic (TEM) transmission line intersecting said apertures which has a length of five quarters of a wavelength or an integral number of wavelengths longer as measured in the secondary line system between the intersections with said apertures, a portion of the microwave energy being coupled through said apertures into the secondary line; a terminating resistance at either end of said secondary transmission line, and a diode detector and series bypass capacitor connected across each resistance for developing output signals respectively indicative of forward and reflected power flow in the waveguide.
Claim 2
Dependent Claim
152 words
A directional coupler and detector in combination with wavewguide through which microwave energy propagates from a source to a load and vice versa and which has a pair of coupling apertures in one wall that are spaced apart in the direction of wave propagation one quarter wavelength as measured in the waveguide system; said directional coupler and detector comprising a secondary transverse electromagnetic (TEM) transmission line intersecting said apertures which has a length of five quarters of a wavelength or an integral number of wavelengths longer as measured in the secondary line system between the intersections with said apertures, a portion of the microwave energy being coupled through said apertures into the secondary line; a terminating resistance at either end of said secondary transmission line, and a diode detector and series bypass capacitor connected across each resistance for developing output signals respectively indicative of forward and reflected power flow in the waveguide.
Claim 3
Dependent Claim
25 words
The combination of claim 1 wherein said secondary transmission line is a microstrip line on a dielectric substrate board which is secured to the waveguide.
Claim 4
Dependent Claim
39 words
The combination of claim 1 wherein said secondary transmission line, terminating resistances and bypass capacitors are printed circuit components on a dielectric substrate board which is secured to the waveguide, the diode detectors also being mounted on said board.
Claim 5
Dependent Claim
143 words
A directional coupler and detector module in combination with rectangular waveguide through which microwave energy propagates from a source to a load and vice versa and which has a pair of coupling apertures in one wall that are spaced apart in the direction of wave propagation one quarter wavelength as measured in the waveguide system; said directional coupler and detector module comprising a secondary serpentine microstrip transmission line on a substrate board which crosses said apertures and which has a length of five quarters of a wavelength as measured in the secondary line system between the intersections with said apertures, a portion of the microwave energy being coupled through said apertures into the microstrip line; and means on said board at both ends of said microstrip line for developing separate dc output signals indicative of forward and reflected power flow in the waveguide.
Claim 6
Dependent Claim
143 words
A directional coupler and detector module in combination with rectangular waveguide through which microwave energy propagates from a source to a load and vice versa and which has a pair of coupling apertures in one wall that are spaced apart in the direction of wave propagation one quarter wavelength as measured in the waveguide system; said directional coupler and detector module comprising a secondary serpentine microstrip transmission line on a substrate board which crosses said apertures and which has a length of five quarters of a wavelength as measured in the secondary line system between the intersections with said apertures, a portion of the microwave energy being coupled through said apertures into the microstrip line; and means on said board at both ends of said microstrip line for developing separate dc output signals indicative of forward and reflected power flow in the waveguide.
Claim 7
Dependent Claim
62 words
The combination of claim 4 wherein the last-mentioned means comprises terminating resistors deposited on the board at either end of said microstrip line, opposing metallizations on the board to serve as two rf bypass capacitors, and diode detectors connected between each end of said microstrip line and an associated metallization which further has an output lead for one of said dc signals.
Claim 8
Dependent Claim
145 words
In a microwave oven having a source of microwave energy and rectangular waveguide through which wave energy propagates to and from an oven cavity and which has a pair of coupling apertures in one wall that are spaced apart in the direction of wave propagation one quarter wavelength as measured in the waveguide system, the combination with said rectangular waveguide of a directional coupler and detector module; said directional coupler and detector comprising a secondary transverse electromagnetic (TEM) transmission line intersecting said apertures which has a length of five quarters of a wavelength as measured in the secondary line system between the intersections with said apertures, a portion of the wave energy being coupled through said apertures into the secondary line; and means at each end of said secondary line for developing output signals indicative of the forward and reflected power flow in the waveguide.
Claim 9
Dependent Claim
145 words
In a microwave oven having a source of microwave energy and rectangular waveguide through which wave energy propagates to and from an oven cavity and which has a pair of coupling apertures in one wall that are spaced apart in the direction of wave propagation one quarter wavelength as measured in the waveguide system, the combination with said rectangular waveguide of a directional coupler and detector module; said directional coupler and detector comprising a secondary transverse electromagnetic (TEM) transmission line intersecting said apertures which has a length of five quarters of a wavelength as measured in the secondary line system between the intersections with said apertures, a portion of the wave energy being coupled through said apertures into the secondary line; and means at each end of said secondary line for developing output signals indicative of the forward and reflected power flow in the waveguide.
Claim 10
Dependent Claim
25 words
The combination of claim 6 wherein said secondary transmission line is a serpentine microstrip line on a substrate board which is secured to the waveguide.
Claim 11
Dependent Claim
63 words
The combination of claim 7 wherein the last-mentioned means comprises terminating resistors deposited on said board at each end of said microstrip line, opposing metallizations on said board to serve as two rf bypass capacitors, and two diode detectors each connected between an end of said microstrip line and an associated metallization which further has an output lead for a corresponding output signal.
Claim 12
Dependent Claim
81 words
The combination of claim 6 wherein the last-mentioned means comprises a terminating resistor at each end of said secondary transmission line, and a diode detector and series rf bypass capacitor connected across each resistor for developing dc output signals indicative of forward and reflected power flow in the waveguide, said secondary line and terminating resistors and bypass capacitors being printed circuit components on a substrate board which is secured to the waveguide, the diode detectors also being mounted on said board.
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) | 1983-07-08 | 1984-01-07 | 1984-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-08 | 1988-01-07 | 1988-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-08 | 1992-01-07 | 1992-07-08 | $7700.00 | Window Closed / Lapsed |