Reactive near-field antenna measurement
AssigneeEmscan Corporation
InventorsRuska PATTON, Kasra PAYANDEHJOO
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Abstract
A method of calibrating or correcting near field or far field data from a scanner board array of integrated measuring probes that are electronically switched to capture near-field data from an antenna-under-test (AUT) and having a board output includes the steps of coupling a calibrating probe with one of the measuring probes, measuring the power through the measuring probe and the calibrating probe and isolating the effect of the RF path from the measuring probe to the board output by removing the effect of the calibrating probe, and repeating for each measuring probe. Also disclosed are methods for correcting for scattering effects and loading effects on the AUT.
Claims10
A method of calibrating a scanner comprising an scanner board array of integrated measuring probes that are electronically switched to capture near-field data from an AUT and having a board output , comprising the steps of:
- (a) coupling a calibrating probe with one of the measuring probes;
- (b) measuring the power through the measuring probe and the calibrating probe and isolating the effect of the RF path from the measuring probe to the board output by removing the effect of the calibrating probe;
- (c) repeating steps (a) and (b) for each measuring probe;
- (d) creating a calibration file for the array comprising a correction for each measurement probe RF path.
A method of correcting the output of a scanner comprising an scanner board array of integrated measuring probes that are electronically switched to capture near-field data from an AUT to account for the scattering effect of the scanner, wherein said correction is calculated by comparing the H-field distribution measurements actually obtained from the scanner with results obtained from a software simulation.
A method of correcting the output of a scanner comprising an scanner board array of integrated measuring probes that are electronically switched to capture near-field data from an AUT to account for the loading effect of a measuring probe on the AUT, wherein the correction is calculated by comparing the measurements actually obtained from the scanner with results obtained from empirical testing in an anechoic chamber,
An antenna measurement device comprising an array of integrated probes that are electronically switched to capture near-field data in proximity of an AUT, wherein the device comprises a processor adapted to transform near-field data to the far-field using a far field transformation method, and to implement the calibration or correction steps of any one of claims 1 to 10.
Dependencies are inferred from the claim text.