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Abstract
A method has been devised to derive the coupling coefficient between two infinitely long perfectly conducting surface-wave antennas such as disc-on-rod antennas. This method is based on the Lorentz reciprocity theorem and on the equivalence principle. The theoretical derivation of a general expression for the coupling coefficient as well as numerical results for disc-on-rod antennas are presented in this paper. Results based on this method have been found to be in good agreement with those obtained from an analysis of element interaction in a broadside array of traveling-wave end-fire antennas.