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Practical Antenna Handbook 5/e, 5th Edition by George W. Hippisley, Joseph J. Carr

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CHAPTER 5Antenna Arrays and Array Gain

Multiple antennas or antenna elements fed from a common source of radiofrequency (RF) energy are collectively called an array. (Similarly, multiple antennas feeding a single receiver input also form an array.) The received signal at any distant point from an array of transmitting antennas is a combination of the signals from all the fed elements. Because each signal arriving at the receiving antenna has traveled a unique distance and its drive signal may have been phase-shifted with respect to others, the received signal is the vectorial combination of the contributions from all the elements of the array.

Arrays are of interest because they make it possible, for a given transmitter power, to increase received ...

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