Com-Power AC-220 Manual - Page 13

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Theory of Operation

3.1 Theory of Operation

Distributed by: Reliant EMC LLC, +1 408 916‐5750, [email protected], www.reliantemc.com

This chapter explains the following:

Overview

Theory of Operation

This section describes the theory of operation of the AC-220 Combilog

antenna.

Broadband antennas allow measurement of signals over a wide frequency

range. These antennas do not require any tuning or balun switching

during measurement. It is very useful for sweep measurement over the

frequency range of operation. Models AC-220 Combilog Antennas is a

broadband antenna that operate in the frequency range of 30 MHz to 2000

MHz.

Before the Combilog antennas are used for measurement they have to be

calibrated. Typically antenna calibration is performed in an open field test

site( OATS). During calibration a known field strength (dBuV/m) is

generated around the antenna at each frequency (30 MHz -2000 MHz).

The difference between field strength (dBuV) received by the antenna and

known field strength generated ( dBuV) is the antenna factor (dB) for that

frequency. During EMC testing the antenna factor for the frequency of

interest is added back to reading on the EMI meter or spectrum analyzer

to measure field strength.

dBuV/m (field strength) = dBuV (output measured) + Antenna Factor

3-1

AC-220 Combilog Antenna