Microwave directional coupler and detector module
AssigneeGeneral Electric Company
InventorRudolph A. Dehn
Life of this patent
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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.
Claims9
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.
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.
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.
Dependencies are inferred from the claim text.