What is directional in directional coupler

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A directional coupler’s “directional” property refers to its ability to ​​separate forward and reflected signals​​ (20-40dB isolation). It samples ​​-10dB to -30dB​​ of the main signal while introducing ​​<0.5dB insertion loss​​. The coupler uses ​​λ/4 waveguide spacing​​ and ​​50Ω/75Ω impedance matching​​ to achieve ​​90% power transfer efficiency​​, operating from ​​DC-40GHz​​. Directionality ensures accurate ​​VSWR measurements​​ […]

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