Strip transmission line study

A TEM transmission line having a circular or rectangular center conductor placed between two parallel plates or inside a rectangular tube, has been used in the construction of a number of uhf antennas and ¿ wave filters. The characteristic impedance of the class of transmission lines, of which the above-mentioned are particular examples, can be theoretically calculated by a number of methods. A review of the theoretical methods using the above transmission lines as examples will be given. Comparison between theoretical and measured results will be given to show the usefulness of the different theoretical methods.