Selecting Sampling Interval in the Improved Spectral Domain Method to Simulate Microstrip Circuits

─ In this paper, we investigate the spectral method that calculates the S-parameters for microstrip circuits and antennas. A sampling interval selection criterion is proposed. The scheme for low-loss cases is specially discussed. Several examples are employed to demonstrate the engineering applications of the spectral domain method and its results are compared with previously published and measured results. Index Terms Microstrip circuits, sampling interval, and spectral domain method.

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