Fuminori Sakai

UWB array antenna utilizing novel electrical scanning system with tapped delay lines

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.

A UWB through-wall radar using beam scanning array antenna

A UWB through-wall radar using novel beam scanning array antenna previously proposed by the authors is described. This antenna scanning system has two new technologies. First, each antenna element is equipped with an impulse generator. Second, the time control between the antenna elements is realized by using tapped delay lines and by transmitting trigger signals. Based upon above technology, experimental UWB through-wall radar having beam scanning capability is designed and constructed. The fabricated radar has compact size and light weight and is easy to use. The measurement results show excellent space resolution as a through-wall radar.

Multi focus millimeter-wave imaging radar using inline Tx/Rx printed antennas

Multi focus imaging radar using two pair of inline Tx/Rx printed antennas has been proposed. Antipodal Fermi antennas have been employed both for Tx/Rx antennas. Basic characteristics of the proposed imaging radar including the effect of offset of Tx/Rx antennas have been discussed by experiments. Imaging of conducting rods located on styrofoam with 250mm range, and scissors and gun have been performed using frequency range of 35 GHz to 70 GHz confirming deep image region without distortion.