CONSIDERATIONS IN EMI ANTENNA DESIGN
The antennas used in ElectroMagnetic Compatibility (EMC) testing, and, specifically, in ElectroMagnetic Interference (EMI) testing, have some significantly different considerations than antennas that are used in other industries (e.g., the communication industry). The antennas required for EMI testing require very wide bandwidths. Also, these antennas are used at very short distances from the Equipment Under Test (EUT). That is, the antennas are used in a region called the radiated near-field, or Fresnel zone. Achieving balance becomes a crucial consideration, especially at the lower frequencies (e.g., below 80 MHz). Lastly, test configuration is a limiting factor, as these antennas are used mostly in small enclosures, over metal ground planes, which puts restrictions on the size of the antennas.
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