What are Quadrature Hybrids?

What are Quadrature Hybrid Couplers?

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- everything RF

Feb 21, 2019

Quadrature Hybrid is another name for a 90° Hybrid Coupler. They are four port devices that split an input signal equally between two output ports with a 90 degree phase difference between them. As seen in the diagram below, an input signal is fed from port A, we get equal amplitude signals at ports C & D with 90° phase difference. Port B is isolated.