Abstract

Microstrip transmission lines used in microwave integrated circuits are dispersive. The dispersion of the lines is fully characterized by the frequency-dependent normalized phase velocity VP which is equal to the ratio of guide wavelength λ g to free-space wavelength λ 0 . An approximate equation is given for the normalized phase velocity VP and for the frequency-dependent line impedance Z for standard microstrip transmission lines. Comparison with available experimental data and computed data shows that the error of the approximation is less than 3 percent for microstrip transmission lines commonly used in engineering applications.

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