By means of conformal transformations, the electrostatic energy of a charge
d N-regular polygon-multifin transmission line is achieved first. The elect
rostatic force exerted on each side of the outer wall is computed by using
the principle of virtual work. Regarding the properties of the field, the e
lectrostatic force exerted on each side of the inner fin could be calculate
d. The dependent variable and invariant quantities are analyzed as the cros
s section of the line undergoes a geometric equiform conversion. The cases
for the triangular line, the square line and the hexagonal line are taken a
s typical examples. (C) 2001 Elsevier Science B.V. All rights reserved.