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A relatively simple, straightforward, self-contained derivation, sufficiently general for most engineering purposes, is given to show that passivity implies causality for the input-impedance representation of linear, single-port, time-invariant transmitting antennas.… Click to show full abstract
A relatively simple, straightforward, self-contained derivation, sufficiently general for most engineering purposes, is given to show that passivity implies causality for the input-impedance representation of linear, single-port, time-invariant transmitting antennas. The necessary and sufficient condition on the time-domain input impedance for the electrical stability of these antennas is also derived. It is shown that a series resistance-reactance representation of the input impedance of an antiresonant passive antenna has a noncausal and nonpassive time-domain resistance and reactance, even though the total time-domain input impedance satisfies the passivity, causality, and stability conditions.
Journal Title: IEEE Transactions on Antennas and Propagation
Year Published: 2022
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