Table Of Contents

Glossary

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    Last Modified: January 2, 2020

    • Anechoic chamber— A room designed to completely absorb reflections of either sound or electromagnetic waves. They are also often isolated from waves entering from their surroundings.
    • Effective isotropic radiated power (EIRP)— The power radiated by a perfectly isotropic (omni-directional) antenna that results in the same electromagnetic field strength at the measurement antenna that the antenna under test produces. If given without directional information, this is understood to be the maximum such value over all spherical angles.
    • Free-space path loss (FSPL)— The loss in signal strength of an electromagnetic wave that would result from a line-of-sight path through free space, with no obstacles nearby to cause reflection or diffraction.
    • Measurement antenna—A passive antenna used to take radiated measurement in an OTA test setup. The same antenna including the fixtures and cabling is used for the system calibration procedure and for taking measurements of an actual DUT. Also known as the probe or zenith antenna.
    • Phase array antenna— In antenna theory, a phased array is an electronically scanned array; a computer-controlled array of antennas which creates a beam of radio waves that can be electronically steered to point in different directions without moving the antennas.
    • Quiet zone (QZ)— The quiet zone of an anechoic chamber describes a spherical volume where electromagnetic waves reflected from the walls, floor, and ceiling are stated to be below a certain specified minimum.
    • Reference antenna—A passive antenna with a known gain value backed up with a calibration certificate. Also known as the calibration antenna.

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