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#158: Directional Coupler Basics & how to sweep SWR of an antenna | Return Loss | VSWR
w2aew
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#196: How a Directional Coupler in an SWR meter works
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Example based on Directional Coupler
Engineering Funda
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2kW Directional Coupler for LDMOS Amlifiers
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Even-odd mode analysis of 90 degree coupler/Branch line coupler by Dr. Niraj Kumar VIT Chennai
RF Design Basics