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DETERMINATION OF CAPACITANCE FOR VARIOUS TWINLINE GEOMETRIES IN SEA WATER USING ANALOG TECHNIQUES,
NAVAL UNDERWATER ORDNANCE STATION NEWPORT R I
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New methods for determining transmission line characteristics would certainly be welcomed, especially if it were possible to eliminate the expensive electrical equipment, long samples of line, pick-up, etc., which are necessary for fast, simple, and accurate results. One method is investigated which can be applied in measuring the capacitance of a particular transmission line, a miniature twin-line, in sea water. Electrical measurements were made as a means of comparing the results obtained by the analog technique with that computed from the electrical data. The calculation is presented of line capacitance for the oval twin-line in sea water, using conformal mapping together with a SchwartzChristoffel Transformation to facilitate the field plots and arrive at an accurate value of capacitance. An attempt is made to compare various ovals with a cirdular cross section in order to determine what effect the different configurations ave on the capacitance of the circuit. Finally, with the wire size and dielectric cross sectional area held constant, the cross section is varied until an optimum proportioning exists for minimum capacitance. Author
APPROVED FOR PUBLIC RELEASE