When you say static capacitance [per unit length] and static inductance [per unit length] of a transmission line, what do you mean by the word 'static'? Do you mean constant capacitance per unit length, or do you mean something else?
Dear Thomas Cuff, my doubt is for the analysis of the time-harmonic electromagnetic field, how can we take electrostatic behavior like inductance and capacitance into account. As the field behavior is completely different and wavelength is comparable with the physical dimension of the device, is it sufficient by considering capacitance per unit length or inductance per unit length? Whether we can calculate the field correctly by this approach.