什么是天线效率？

erad is Radiation Efficiency
eref is Reflection Efficiency
Rrad is Radiation resistance
RL is load resistance

Total efficiency e=eref*erad eref reflection efficiency is the power loss caused by the impedance mismatch between the antenna input and the generatorerad Radiation eff for an electrically small antenna is the relation of the power radiated from the antenna to the power accepted by the antenna from the generator erad =Rrad/(Rrad+RL)

天线的效率是指在无源时的效率，而手机的效率是指在有源时的效率