Shadow loss

In telecommunication, the term shadow loss has the following meanings:

The attenuation caused to a radio signal by obstructions in the propagation path.
In a reflector antenna, the relative reduction in the effective aperture of the antenna caused by the masking effect of other antenna parts, such as a feed horn or a secondary reflector, which parts obstruct the radiation path.

References

This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).

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