An extensive set of curves for the aperture admittance of a waveguide-fed axial slot on a coated metal cylinder is presented for both an underdense plasma and a Teflon coating. Examination of these curves shows that a slot on a cylinder with aKaof 2 to 3 has about the same aperture admittance as the identical slot opening onto a flat ground plane.
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Croswell et al. (1972) studied this question.
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