1.

For the above directional coupler a coupling factor in dB is:

A. \(10\,{\log _{10}}\frac{{{P_1}}}{{{P_4}}}\)
B. \(10\,{\log _{10}}\frac{{{P_1}}}{{{P_2}}}\)
C. \(10\,{\log _{10}}\frac{{{P_2}}}{{{P_4}}}\)
D. \(10\,{\log _{10}}\frac{{{P_1}}}{{{P_3}}}\)
Answer» B. \(10\,{\log _{10}}\frac{{{P_1}}}{{{P_2}}}\)


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