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Is it possible to calculate the properties of two coupled transmission lines, which form a directional coupler, with a view to calculate the properties of a directional coupler?

April 26, 2017CALCULATE Coupled coupler directional form possible properties transmission view

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Is it possible to calculate the properties of two coupled transmission lines, which form a directional coupler, with a view to calculate the properties of a directional coupler?

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• Answer:When there are two coupled transmission lines, there is not a single characteristic impedance Zo, but instead an even-mode impedance Zeven and an odd-mode impedance Zodd. An odd-mode impedance is calculated when the two lines are driven out of phase and an even-mode impedance when they are driven in phase. Versions of atlc from 4.0.0 onwards are able to calculate an even-mode impedance Zeven and an odd-mode impedance Zodd Also calculated are the common mode impedance Zcomm and the differential mode impedance Zdiff.