What is the advantage of multiple antenna in receiver in energy harvesting ?
Assume there are $3$ transmitted antennas in the A device,and $1$ received antenna in the B device,now assume A device use beamforming with $3$ antenna to transmit some signal to B device,and B device harvest $0.1W$ power from the signal.
Now if i add one more received antenna to device B,that is, there are $2$ antennas in B device now,and assume these two antennas are very closed,how much power will device B harvest now? still $0.1W$? or $0.1W\times2$ ?
I am confused about this question,because if device B still harvest $0.1W$,then what is the advantage of multiple antenna in receiver in energy harvesting ?
If device B harvest $0.1W\times2$,and this mean if i want to create power,i just use $1$ antenna to transmit 1W RF power to a receiver with $\infty$ antennas receiver,then i can get $0.1W\times \infty $ power ,but it is impossible .