g86
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Look at the linear array of two antennas below. first element is a power divider and its output ports are connected to antennas. Power divider S-para are given below the figure.
<figure>
port 1(input) =<port 2and 3 --- [connected to antennas 1 and 2]
</figure>
(S11=0, S22=-6dB, S33= -6 dB and S32=-6dB)[no isolation R]
Normally we use equal and unequal power dividers for antenna arrays. When the antenna is transmitting and the input port of power divider is fully matched, power will appear at antennas and will be radiated. But at receiving mode the input impedance at output ports are not matched (we know for a equal power divider S22 or S33= -6 dB) so all power will not appear at port 1.
My question is how we can apply "Theory of reciprocity for these arrays". Are they really good radiators and bad receivers.
I am more confused when amplitude taparings are there in a large planer array.
:!: :idea: :?:
<figure>
port 1(input) =<port 2and 3 --- [connected to antennas 1 and 2]
</figure>
(S11=0, S22=-6dB, S33= -6 dB and S32=-6dB)[no isolation R]
Normally we use equal and unequal power dividers for antenna arrays. When the antenna is transmitting and the input port of power divider is fully matched, power will appear at antennas and will be radiated. But at receiving mode the input impedance at output ports are not matched (we know for a equal power divider S22 or S33= -6 dB) so all power will not appear at port 1.
My question is how we can apply "Theory of reciprocity for these arrays". Are they really good radiators and bad receivers.
I am more confused when amplitude taparings are there in a large planer array.
:!: :idea: :?: