A standard directional coupler has 4 ports: Input (Port 1), Transmitted (Port 2), Coupled (Port 3), and Isolated (Port 4). The coupled port samples 5-30 dB of the input signal (e.g., 10 dB for common RF applications), while the isolated port minimizes reflections (<-20 dB). Models vary—some have 3 ports if isolation isn’t needed. Key […]
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