Q. At a frequency of 1 GHz and transmitter receiver distance of 30 mi, which is the most efficient device for energy transfer:
Solution:
An antenna is an array of conductors , electrically connected to the receiver or transmitter. Antennas can be designed to transmit and receive radio waves in all horizontal directions equally, or preferentially in a particular direction .An antenna may include components not connected to the transmitter, parabolic reflectors, horns, or parasitic elements, which serve to direct the radio waves into a beam or other desired radiation pattern . so for high frequency and long distance antenna is used
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