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Analysis of Beamforming Antenna for Practical Indoor Location-Tracking Application

1
IT Research Institute, Chosun University, Gwangju 61452, Korea
2
Department of Information and Communication Engineering, Chosun University, Gwangju 61452, Korea
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(14), 3040; https://doi.org/10.3390/s19143040
Received: 18 May 2019 / Revised: 28 June 2019 / Accepted: 9 July 2019 / Published: 10 July 2019
(This article belongs to the Section Physical Sensors)

Abstract

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. View Full-Text
Keywords: beamforming antenna; Butler matrix; tapered slot antenna; indoor location tracking; IR-UWB radar beamforming antenna; Butler matrix; tapered slot antenna; indoor location tracking; IR-UWB radar
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kim, S.-W.; Choi, D.-Y. Analysis of Beamforming Antenna for Practical Indoor Location-Tracking Application. Sensors 2019, 19, 3040.

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