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In this paper, we present a newly developed UWB array antenna adopting a novel electrical scanning system. This antenna was realized by introducing two new technologies. First, each antenna element is equipped with an impulse generator. Second, the phase control between the antenna elements is realized by tapped lines and transmitting trigger signals. An experimental UWB array antenna with 16 elements has been designed and fabricated. The measurement results showed excellent performance of the antenna. Thus, it is expected that this UWB antenna system will contribute to performance improvement, compact size and cost reduction of UWB radar systems such as obstacle detectors and anticollision sensors.

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