Microwave power sensors
AssigneeMarconi Instruments Limited
InventorsPaul A. McAllister, Thomas G. McConnell, Frederick R. Weston
Life of this patent
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Abstract
A microwave power sensor utilizing a semiconductor power absorption element which is mounted on a fin-line structure within a waveguide channel. In order to check calibration of the sensor, a coaxial line is used to feed a relatively low frequency reference signal to the power sensor. The power element is positioned between the input port of the waveguide and a coaxial line input port at which the reference signal is applied. The use of a precise and accurate reference signal enables the power sensor to be used for microwave measurements.
Claims13
A microwave power sensor including
- a waveguide section;
- power absorption means having two power elements located within said waveguide section, said power absorption means absorbing microwave power applied thereto;
- a fin line structure located within said waveguide section, said power absorption means being mounted on said structure for coupling to a source of incident microwave power;
- and
- means for applying a reference power signal at a sub-microwave frequency to the absorption means via a transmission line having a predetermined characteristic impedance, the two power elements of said power absorption means being connected effectively in series to receive said microwave power and effectively in parallel to receive said reference power signal.
A microwave power sensor including
- a waveguide section;
- a power absorption device located within said waveguide section, said power absorption device absorbing microwave power applied thereto;
- a fin line structure on which said power absorption device is mounted for coupling to a source of incident microwave power;
- means for applying a reference power signal at a sub-microwave frequency to said power absorption device, said means including a transmission line comprising a dielectric substrate having a planar conductor mounted thereon and a coaxial cable connected to said planar conductor for receiving said reference power signal;
- and
- a d.c. decoupling capacitor connected between said coaxial cable and said power absorption device.
Dependencies are inferred from the claim text.