tryto plz help me solve this or guide me:?

A four port directional coupler is splitting 4:1 ratio and excessive loss (-10log (P3 + P2) / P1) equals 2.0 db.thecoupler directivity is 40 dB (1) What role will the input power to each port (2) calculate the loss to exploit their formula is-10log (P3/P2)

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Simulation of a directional coupler using a beam propagation method (FEAB)

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