LAUSR

In this work, a gain-enhanced Vivaldi antenna is proposed, which is integrated with the transceiver on a printed circuit board. The gain and the radiation pattern are improved with the addition of the optimization strips in front of the flare without extending the antenna width. Finally, conventional and gain-enhanced Vivaldi antennas are fabricated and applied to the through-wall radar(TWR) system. According to the measurement results, the gain of the proposed antenna is 3 dB higher than that of the conventional antenna in the operating frequency range from 4 to 6 GHz. Meanwhile, the gain fluctuation is more stable and the beamwidth is narrower. The testing results of different scenarios illustrate that the TWR with the gain-enhanced antenna possessed farther detection distance and higher angular resolution compared with the system using a conventional antenna. The characteristics of the high integration and miniaturization make the TWR system suitable for individuals in handheld or wearable applications.