Kim Sun-Woong, Choi Dong-You
IT Research Institute, Chosun University, Gwangju 61452, Korea.
Department of Information and Communication Engineering, Chosun University, Gwangju 61452, Korea.
Sensors (Basel). 2019 Jul 10;19(14):3040. doi: 10.3390/s19143040.
The single antenna used in conventional ultra-wideband radar has difficulty tracking targets over a wide range because of a relatively narrow beamwidth. Herein, we propose a beamforming antenna that can track targets over a wide range by electronically controlling the main beam of the antenna. The proposed beamforming antenna was fabricated by connecting a 1 × 4 linear array antenna and a 4 × 4 Butler matrix. The Butler matrix was fabricated in a laminated substrate using two TRF-45 substrates. Furthermore, the input Ports 1-4 generate a phase difference at regular intervals in each output port, and the output phase is fed to the array antenna. The proposed tapered-slot antenna was fabricated on a Taconic TLY substrate, and the impedance bandwidth of the antenna was achieved within a wide bandwidth of 4.32 GHz by satisfying a VSWR (Voltage Standing Wave Ratio) ≤2 within the 1.45-5.78 GHz band. Furthermore, the fabricated antenna has directional radiation patterns, which was found to be a suitable characsteristic for location tracking in a certain direction. Finally, the beamforming antenna has four beamforming angles, and to verify the performance for an indoor location tracking application of impulse-radio ultra-wideband radar, it was connected to an NVA-R661 module.
由于波束宽度相对较窄，传统超宽带雷达中使用的单个天线在大范围跟踪目标时存在困难。在此，我们提出一种波束形成天线，它可以通过电子控制天线的主波束在宽范围内跟踪目标。所提出的波束形成天线是通过连接一个1×4线性阵列天线和一个4×4巴特勒矩阵制成的。巴特勒矩阵是在使用两个TRF - 45基板的层压基板中制造的。此外，输入端口1 - 4在每个输出端口以规则间隔产生相位差，并且输出相位被馈送到阵列天线。所提出的渐变槽天线是在Taconic TLY基板上制造的，通过在1.45 - 5.78 GHz频段内满足电压驻波比（VSWR）≤2，天线在4.32 GHz的宽带宽内实现了阻抗带宽。此外，制造的天线具有定向辐射方向图，这被发现是在特定方向上进行位置跟踪的合适特性。最后，波束形成天线有四个波束形成角度，为了验证其在脉冲无线电超宽带雷达室内位置跟踪应用中的性能，将其连接到一个NVA - R661模块。
