Enhanced field strength is best understood by considering the simple case of a direct and a reflected plane-wave signal interfering with each other. Enhancement occurs at all points in space where direct and reflected wave fronts differ in phase by multiples of 2tt. A HSP exists when an arrangement of reflecting surfaces supports multiple reflections allowing a standing wave (resonance) field to build up. The phase relationship between direct and reflected monochromatic (fQ) signals will be influenced by the size and shape of the enclosure, by the presence and location of objects and persons, and by the position of the test point. A practical resonator stores electromagnetic energy at the resonance frequency f and, simultaneously, suffers a power loss Pf from conduction, dielectric, and diffraction effects. Two dimensionless factors can be defined to describe the resonance case. They are the quality- or Q-factor, and the coupling coefficient, q = energy available to sustain a resonance field total energy available (SX.) One speaks of a resonance when With respect to a field strength maximum Eq of a resonance within habitable space, we assume the following: 1) Only part of the penetrated energy SX^ is coupled to support a resonance field which yields for (12) that 2) Any local maximum E of the resonance field is enhanced by the quality factor Q over the field energy qE^ = q^ qE , which excites the resonance. 3) The field strength is distributed around the resonance frequency f according to where the frequency is normalized to a = 2Q(fo - ff)/fr in multiples of the resonance halfwidth ff/2Q with reference to the SPS frequency fQ.
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