A Miniaturized Broadband 1-Bit Coding Reconfigurable Intelligent Surface for NLOS UE Localization and Uplink Communication
Khagendra Joshi, Deepak Kumar Sahoo, Kamalesh Kumar K, Debidas Kundu, Vivek A. Bohara, and Amalendu Patnaik

TL;DR
This paper introduces a compact broadband 1-bit coding RIS with a miniaturized unit cell, demonstrating its effectiveness for NLOS UE localization and uplink communication in LTE frameworks.
Contribution
The work presents a novel miniaturized broadband 1-bit coding metasurface RIS with stable phase response and demonstrates its application in NLOS localization and uplink communication.
Findings
Achieved phase difference of 180° ± 30° over 4.85-6.05 GHz.
Constructed a 16×10 element RIS prototype validated by experiments.
Demonstrated RIS capability for NLOS UE localization and robust uplink communication.
Abstract
In this paper, a broadband 1-bit coding metasurface-based reconfigurable intelligent surface (RIS) is presented. The unit cell of the metasurface consists of a wide dipole modified with interdigital capacitors and loaded with an SMP 1340-040LF PIN diode. The proposed element offers cell miniaturization and a stable angular response. A phase difference of 180 30 is achieved for a frequency range of 4.85-6.05 GHz between the ON and OFF states for the normal incidence of the TE polarized wave, whereas it provides a fairly stable response with reflection loss of less than 3 dB and phase difference of 180 50 for oblique incidence up to 45. The RF is isolated from the DC on the bias lines using properly designed butterfly-shaped radial stubs. Using this unit cell, a prototype with an array of 16 10 elements is constructed. A…
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