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A directional coupler is a passive device used in radio technology. The purpose of a directional coupler is to couple electromagnetic power to be used in another circuit.

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A directional coupler is a passive device used in radio technology. The purpose of a directional coupler is to couple electromagnetic power to be used in another circuit.

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Changan Sun has written:

'Vibration analysis of an optical fiber coupler'

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They must be powered to boost the signal. If they are not powered they are "passive" and will consume some of the signal.

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