#403: Measuring a Directional Coupler with a SV4401A VNA
This video shows the process of setting up, calibrating and using a SV4401A Vector Network Analyzer to characterize the Return Loss (Reflection Coefficient), VSWR, Mainline Loss (Transmission Coeff), Coupling Ratio and Directivity of a Mini-Circuit ZFDC-20-5+ directional coupler over a 100kHz to 2GHz frequency range. 00:00 Introduction 00:28 Review of Measurements of a Directional Coupler 02:14 Specifications of the Mini Circuit ZFDC-20-5+ 03:53 Setup VNA Frequency Range 04:17 Calibration Considerations 05:17 Calibration Process 07:00 Setup for Return Loss (reflection coefficient S11) and SWR 08:25 Validate the test terminations 09:52 Making the S11/Return Loss/SWR measurements 11:34 Mainline Loss Measurements 13:05 Measuring Coupling Ratio 14:18 Setup for Directivity with Reference trace 15:39 Marker setup 17:20 Directivity Calculation 18:23 Wrap-up

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