Figure 1. The coupling coefficient q. of a circular aperture as a function of the diameter d/X. Shown are the results of two different theoretical treatments (Koch and Koi big, 1968) Figure 2. E-—field distribution in circular and square apertures (a < 0.1 X) excited by an E -field (a) E. field sampled along x-axis (b) E. field sampled along y-axis (Butler et al., 1978)
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