Question: The transmitting and receiving antennas in a wireless communications system are quarterwave monopole antennas with an efficiency of ( 9 7 ) / ( %

The transmitting and receiving antennas in a wireless communications system are quarterwave monopole antennas with an efficiency of

(97) / (%) .

The antennas are polarisation aligned, and are located

2

km apart. The power at the receiver is

80

dB smaller than the power at the transmitter.

1 .

a Draw a diagram of this wireless communications system. Assuming the antennas are matched to the feeding transmission line, what is the operating frequency of this communication system?

1 .

b If the feeding transmission line to both antennas is changed to a

100

ohm line, what is the power at the transmitter if the power at the receiver is

3

The transmitting and receiving antennas in a

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