Adaptive Microwave Power Transmission System Design The high-power microwave beam from the transmitting antenna is electronically steered and phase controlled through the use of an active retrodirective array [4]. Illis beam control system realizes the quadratic phase distribution at various distances between antennas automatically, providing beam focusing at the center of the receiving antenna. In order to change the beam angular size at various distances, it is necessary to add a controlled phase shifter to each radiation module. There is tuning of the "additional" phase distribution that maintains the system’s characteristics at various positions of the antennas. It is rather difficult to change the amplitude distribution (the antenna illumination taper) electronically and to keep the microwave generators highly efficient, so we assume that the amplitude distribution remains unchanged. Two questions are considered below: A: Assume that the amplitude distribution is chosen. How should one change the "additional" phase distribution in order to maintain both the peak power density at the receiving antenna and the power intercepted by the rectenna (the power received) at various distances between antennas?
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