Passive Horn Antennas (AH series) The AH series Horn antennas are passive antennas and can be used for emissions and immunity testing. These antennas are constructed using light-weight aluminum with a corrosion-resistant conductive coating for indoor or outdoor use. Each antenna is individually calibrated. The calibration data and certificate will be shipped with each antenna.
The high gain reduces input power requirements to generate high electromagnetic field levels for immunity testing. High gain also increases antenna sensitivity to low-level signals. Active Horn Antennas (AHA series) The active horn antennas have a built preamplifier in series with the antenna output. During EMC emission testing, it is imperative to maintain the signal level above the noise floor for accurate emissions measurement.
In a typical setup, a receiving antenna is connected to a preamplifier that is located next to the spectrum analyzer. The output of the preamplifier is then fed to the spectrum analyzer. In this arrangement, the location of the preamplifier is far from the antenna, the interconnecting cable is long. A combination of factors such as a long cable, increasing cable loss (especially for frequencies above 700 MHz), and high antenna factors can reduce the signal. Therefore, these signals may not visible above the noise floor of the receiver. The built-in preamplifier increases the signal the noise ratio by amplifying signal at the antenna output.
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