When 10 mW power is incident at port 1 of the directional coupler shown in Fig. the power meter at port 4 reads 10 W. When the same power is incident at port 2, the meter reads 10 nW. What are the coupling loss and directivity?

When 10 mW power is incident at port 1 of the directional coupler show

1.	When 10 mW power is incident at port 1 of the directional coupler shown in Fig. the power meter at port 4 reads 10 W. When the same power is incident at port 2, the meter reads 10 nW. What are the coupling loss and directivity?
A.	40 dB; 20 dB
B.	30 dB; 40 dB
C.	30 dB; 30 dB
D.	20 dB; 30 dB
Answer» D. 20 dB; 30 dB

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When 10 mW power is incident at port 1 of the directional coupler shown in Fig. the power meter at port 4 reads 10 W. When the same power is incident at port 2, the meter reads 10 nW. What are the coupling loss and directivity?

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