Therefore, it is of interest to determine the likelihood of a significant departure from this pattern. This is especially true of a microwave power transmission system where power density levels outside the main lobe must be maintained below acceptable exposure levels (reference 9). To make this determination one needs a statistical description of the variation about the mean pattern obtained above. Analyses have shown (references 18, 20) that the magnitude of the electric field at the receiver has a statistical distribution of the form of a modified Rayleigh or Rician distribution. Making suitable adjustments to make these results directly applicable to the case at hand (Appendix I), the electric field magnitude has a distribution described by
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