The value of ao is 3.832, giving Fj = 0.838. Thus, 83.8% of the power is in the main lobe. The author [8] has derived a more general version of Equations 5a and 5b, which can be applied to the tapered beams under consideration here. For n = 1, 2, 3,..., the fraction of power that falls within non-dimensional radius u is given by: As before, the fraction of power in the main lobe can be found by setting u equal to aO, the position of the first zero of Jn, giving: The results are summarized in Table 1. Finding the fraction of power in the main lobe of the "ideal" case is slightly more difficult, since the first minimum is not at 7f*rr\ intf»ncitv 'TTir* Inrutinn nf thn firct minimum wac torl nnmf»rir»a11w Tf io
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