Sensor and Simulation Notes Note 53 December 2007
نویسنده
چکیده
The 4:1 equal-delay transformer/balun integral to some impulse radiating antenna (IRA) designs is analyzed including the effects of non-commensurate constituent transmission lines. Specifically, we develop a 2-port Thévenin equivalent source representation of the feed structure that is compatible with most numerical simulations. It is shown that the non-commensurate nature of the balun manifests itself in quasi-periodic frequency-domain ripple in the power transfer of the balun as well as excitation of the common mode. A representative, practical IRA is analyzed by combining the analytically-derived 2-port Thévenin equivalent source with a commercial finite element analysis in order to include many details of the radiating structure. Despite the anomalous behavior of the non-commensurate balun, the impulse radiating antenna is shown to produce almost no significant common mode radiation even when the electrical lengths of the constituent transmission lines are significantly non-commensurate.
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