Departures from Plane-Wave-Like Coupling to a Maverick Missile in the Radiating Near-Field Region of a Horn Antenna
VOSS SCIENTIFIC LLC ALBUQUERQUE NM
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The HPM susceptibility testing often requires irradiating test objects at the highest fluences possible. For aperture antennas, the highest fluences are generally found in the radiating near-field region. For valid effects testing, the energy coupled to the object interior must accurately replicate that which would occur in a true weapon environment plane-wave illumination. Some believe that valid testing requires object placement at distances from the aperture exceeding 2 D squaredlambda Dantenna effective diameter. Many also believe testing at farther away than 2 D squaredlambda guarantees plane-wave-like coupling conditions. Neither view is correct. Testing in the reactive field region lambda from the aperture is generally invalid due to dominance of reactive coupling. For testing in the radiating near field, determination of validity is less trivial. An investigation was performed quantifying deviations from plane-wave coupling. For testing in the radiating near field, determination of validity is less trivial. An investigation was performed quantifying deviations from plane-wave coupling in the radiating near field, for head-on illumination of a Maverick missile in the 1-4 GHz range. The measurements, using an instrumented Maverick missile in an anechoic chamber, and supported by theory, indicate conditions for which testing the Maverick missile accurately simulates plane-wave coupling.
- Radiofrequency Wave Propagation