A Novel Concept for EMC Radiated Immunity Testing using Field Generators
- Author: A. Sarwar, V. Keyser
To improve efficiencies and reduce costs in Electromagnetic Compatibility (EMC) testing, a new instrument is developed which merges antennas and amplifiers to overcome difficulties in the traditional EMC Radiated Immunity (RI) setup. A power amplifier is one of the most expensive instruments in an EMC RI test setup. In the conventional setup, according to IEC-61000-4-3, up to 6 dB of the amplifier’s rated power is lost for several reasons, e.g., internal cabling within the amplifier, the amplifier’s output combiner stage, directional couplers, and cables between the coupler and antenna itself. In this paper a novel concept is presented where active antenna arrays, amplifier stages and directional couplers are combined into one unit, termed a field generator. In this configuration, the E-field (V/m) requirement is emphasized rather than the rated power (W) of the amplifier. Although this concept is not limited to a certain field strength or frequency range, we will discuss the validation of this concept in the 1-6 GHz frequency range to generate 10V/m E-field at a 3m distance to meet the requirements specified in IEC-61000-4-3. The advantages of this concept and a few design challenges in implementation will be discussed. Simulation and measurement results will be presented.
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