For commensurate transmission line circuits constructed using a unit element, transient responses as well as resonance as a steady-state response can be obtained. Such circuits can be analyzed using the z-transform, and transient responses that vary with time can be obtained. In addition, unit elements are symmetrical and lossless circuit elements. If the phase of a unit element is nπ and the internal resistance of the power source is equal to the load resistance, resonance occurs. Resonance also occurs if the phase of a unit element is nπ + π/2 and the product of the internal resistance and the load resistance is equal to the square of the characteristic resistance of the unit element.

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