The propagation of a second type of TEM mode in a slotted coaxial line is analyzed. The characteristic impedance of the slotted line is evaluated by means of variational expressions giving upper and lower bounds to the true value. A two term approximation to the charge distribution and a one term approximation to potential distribution give results accurate to within +-2 per cent. Curves of characteristic impedance against angular slot width are presented.
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R.E. Collin (1956) studied this question.
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