Radio frequency power measurement
AssigneeRacal Instruments Wireless Solutions Limited
InventorsIan Michael Rose, Nigel Kenneth Webb, Christopher John Ward
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Abstract
An unknown RF power is converted to a voltage by a detector (11). The voltage is converted to a number by a digitiser (12). A separate and fixed RF power reference (14) drives a second detector (15), whose voltage output is also converted to a number by the digitiser (12). The RF detectors are thermally coupled. Temperature variations in the RF power to voltage characteristic of the detector (11) are corrected by measuring the RF power reference (14) via the detector (15).
Claims8
A RF power measurement system comprising,
- a first detector for converting RF power to be measured to a first measurement signal,
- a reference source of RF power,
- a second detector, thermally coupled to said first detector, for converting RF power produced by said reference source to a second measurement signal, and
- processing means for numerically applying a predetermined correction factor to said first and second measurement signals obtained at the same temperature to derive a value of said RF power to be measured.
A method for measuring RF power comprising the steps of:
- using a first detector to convert RF power to be measured to a first measurement signal;
- using a second detector, thermally coupled to said first detector, to convert RF power produced by a reference source to a second measurement signal,
- and processing said first and second measurement signals obtained at the same temperature by numerically applying a predetermined correction factor to said first and second measurement signals to derive a value of said RF power to be measured.
Dependencies are inferred from the claim text.