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plz help me! A question about power amplifier and antennas!

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lily1981216

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I need to design a power amplifier driving an antenna which is modeled as a load resistor with 50Ω impedance.And the EIRP should ≤-45dbm.and I wonder what the relationship formula among the gain of amplifier,the loss power of load resistor and the EIRP?thanks!
 

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