How many ports does a directional coupler have
A standard directional coupler has 4 ports: INPUT (accepts 1-100W signals), OUTPUT (through port with <0.5dB insertion loss), COUPLED (extracts -10 to -30dB of input power), and ISOLATED (terminated with 50Ω load achieving >20dB isolation). High-performance models operate from DC-40GHz with directivity >30dB. The coupling factor (e.g., 10/20/30dB) remains stable within ±0.5dB across 85% bandwidth. […]
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