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While some test equipment characteristics such as power amplifier harmonics are obviously a limiting factor, the broadband characteristics of antennas, directional couplers, power meters and isotropic field probes can hardly be considered a limitation for most applications. However, when used with power amplifiers exhibiting significant harmonic distortion in Immunity test systems, the broadband characteristics of these devices can result in measurement uncertainty and unacceptable errors.
In an effort to cover the relatively broad frequency ranges mandated by most modern EMC immunity standards, some amplifier vendors have resorted to combining two amplifier modules within a common enclosure. These so called dual-band amplifiers use frequency band switching to achieve an overall broader frequency band than either amplifier module could cover by itself. This application note will highlight both the benefits and drawbacks of this technique.
