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Voltage-current sensor with high matching directivity

  • US 6,449,568 B1
  • Filed: 02/27/1998
  • Issued: 09/10/2002
  • Est. Priority Date: 02/27/1998
  • Status: Expired due to Term
First Claim
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1. A method of deriving current, voltage and phase information for current and voltage components of an RF power wave, at a selected operating frequency selected within a range of radio frequencies, for each of a plurality of calibrating radio frequencies within said range, comprising:

  • obtaining voltage and current pickup signals under a set of conditions of (a) open circuit load, (b) short circuit load, (c) fixed known impedance load, and (d) said voltage or current being applied at a precise input level to a known load from an RF calibration source for obtaining associated voltage and current signal values;

    computing and storing correction coefficients based on the voltage and current signals obtained under said conditions (a) to (d); and

    at said selected operating frequency, applying said stored correction coefficients to said voltage and current pickup signals to obtain one or more of a corrected voltage value, a corrected current value, and a corrected load impedance value.

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