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2D metamaterial Luneburg lens for enhancing the RCS of chipless dielectric resonator tags

: Zhao, Yixiong; Weidenmüller, Jens; Bögel, Gerd vom; Grabmaier, Anton; Alhaj Abbas, Ali; Solbach, Klaus; Jiménez-Sáez, Alejandro; Schüßler, Martin; Jacoby, Rolf


Institute of Electrical and Electronics Engineers -IEEE-:
Second International Workshop on Mobile Terahertz Systems, IWMTS 2019 : 1-3 July 2019, Bad Neuenahr, Germany
Piscataway, NJ: IEEE, 2019
ISBN: 978-1-7281-1271-8
ISBN: 978-1-7281-1270-1
ISBN: 978-1-7281-1272-5
6 S.
International Workshop on Mobile Terahertz Systems (IWMTS) <2, 2019, Bad Neuenahr>
Deutsche Forschungsgemeinschaft DFG
287022738; MARIE
TRR 196: Mobile Material-Charakterisierung und -Ortung durch Elektromagnetische Abtastung: Teilprojekt C09: RFID-Tags zur Sub-mm-Lokalisierung und Teilprojekt S04: Passives Sub-mm Lokalisierungs-System
Fraunhofer IMS ()
chipless RFID; dielectric resonator (DR); Luneburg lens; metamaterial; radar cross section (RCS); sub-THz RFID

In this paper, a 2D Luneburg lens is proposed to improve the Radar Cross Section (RCS) of dielectric resonator (DR) tags, which would be used for an indoor localization system at THz frequencies where the low RCS of the tag makes the detection against clutter signals difficult. A Luneburg lens made of PTFE is fabricated using milling technique based on metamaterial concept, and characterized using a Vector Network Analyzer (VNA). Three ceramic resonators with different resonance frequencies are placed at different positions in the lens focal area to test the performance of the lens. To prove the concept, the simulation and measurement have been performed at scaled frequencies in the 4.5-7 GHz range. The RCS improvement is found to depend on the lens dimensions and frequencies of operation. A Luneburg lens with a height of 35 mm and a diameter of 66 mm boosts the RCS by 18 dB at 6.2 GHz.