The static distributed capacitances between two arms of dipole antennas are calculated by a finite‐difference method. An equivalent circuit for dipole antennas is proposed. A corresponding time‐domain approach for solving the voltage and current of this circuit is given. Some phenomena occurring in the transmitting procedure are discussed. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 27: 165–168, 2000.

In this paper, a new explanation on the radiation mechanisms of slow and fast traveling waves is presented. The effective radiation sections that give rise to the far-field radiation of the traveling-wave structure are found and studied for the cases of slow and fast waves, respectively. A composite right/left-handed transmission line that can support both of the slow and fast waves in left-and righthanded regions is employed as an example. Based on the uniform linesource assumption, an ideal model of traveling-wave current with the same dispersion behavior as that of the CRLH structure is proposed and used to demonstrate the radiations of slow and fast waves in physical sense. This new understanding of the radiation mechanism of traveling-wave structures is useful to the applications of travelingwave antennas.

Distributed circuit parameter extraction from field result of non-uniform transmission line provides circuit designers an efficient way to predict the effect of non-uniform structures. The motivation of this paper is to study the efficiency and applicability of the extracted distributed circuit parameters. These parameters are extracted from the FDTD results in this paper and are used to construct an equivalent circuit. Exciting the circuit with Gaussian pulse and using the equivalent circuit method, the transmitted and reflected pulse waveforms on the circuit can be obtained. By comparing these waveforms and the corresponding frequency domain S parameters with those obtained directly from FDTD, the applicable scope of the extracted circuit parameters can be studied.

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