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19
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Introduction
Current research interests include antenna theory and designs, radiation pattern synthesis and reconfigurable intelligent surfaces.
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Publications
Publications (19)
Reconfigurable intelligent surfaces (RISs) suffer from high switch costs and complex switch integration with electromagnetic (EM) structures. In this article, we propose solutions to both of the abovementioned problems by screen printing of low-cost vanadium-dioxide (VO2) switches. The VO2 ink has been prepared in-house and batches of switches have...
The upcoming sixth-generation (6G) communication system is set to operate in the Sub-THz band, which could provide substantially higher communication capacity. Meanwhile, the fifth-generation (5G) systems have already started to operate in the millimeter-wave (mm-Wave) bands. Therefore, dual-band antennas, which can operate for both 5G and 6G bands...
This paper presents the concept, design, channel modeling, beamforming algorithm, prototype fabrication, and experimental measurement of an electromagnetically reconfigurable fluid antenna system (ER-FAS), in which each FAS array element features electromagnetic (EM) reconfigurability. Unlike most existing FAS works that investigate spatial reconfi...
Reconfigurable intelligent surface (RIS) with 1-bit phase resolution suffers from high side lobe levels (SLLs) in the near field and pronounced quantization lobe levels (QLLs) in the far field, which is detrimental for the quality of wireless communication. RIS design is further challenging in the mm-wave bands, where typically large bandwidths are...
The integration of reconfigurable intelligent surfaces (RIS) and artificial noise (AN) significantly enhances physical layer security (PLS) in wireless networks, provided that RIS's phase shifts are precisely optimized to prevent security vulner-abilities. This paper introduces a reinforcement learning (RL)-based algorithm designed to optimize the...
Mutual coupling is increasingly important in reconfigurable intelligent surface (RIS)-aided communications, particularly when RIS elements are densely integrated in applications such as holographic communications. This paper experimentally investigates the mutual coupling effect among RIS elements using a mutual coupling-aware communication model b...
Quasi-isotropic antennas that can exhibit circular polarization (CP) are in high demand for applications such as Internet of Things (IoT). These two features ensure orientation and polarization insensitive communication that avoids any disruption in service due to random deployment of IoT devices or due to dynamically varying environment. However,...
This paper investigates the mutual coupling in reconfigurable intelligent surface (RIS)-aided communication. Despite the existence of several mutual coupling-aware models for RIS-aided communication, the absence of experimental validation remains a notable gap. To fill this void, this work delves into the recently proposed mutual coupling-aware com...
Despite the growing interest in reconfigurable intelligent surfaces (RISs) for millimeter-wave (mm-wave) bands, and the considerable theoretical work reported by the communication community, there is a limited number of published works demonstrating practical implementations and experimental results. To the authors’ knowledge, no published literatu...
Despite the growing interest in reconfigurable intelligent surfaces (RISs) for millimeter-wave (mm-wave) bands, and the considerable theoretical work reported by the communication community, there is a limited number of published works demonstrating practical implementations and experimental results. To the authors' knowledge, no published literatu...
This work presents a cross-polar dual-layer chipless radio-frequency identification (RFID) tag based on a ladder-shaped resonator design. An integrated ground plane enables direct attachment to human skin without performance deterioration. Simulations show that the ladder-shaped resonator provides several advantages over traditional L-shaped and st...
Internet of Things (IoT) devices require orientation insensitive communication and a small footprint. Wireless communication should be maintained across the whole operation band, hence electrically small antennas (ESAs) with wideband radiation isotropy are also desired. This paper proposes a theoretical model based on annular ring currents to synth...
Internet of Things (IoT) applications require compact antennas with quasi-isotropic radiation patterns to maintain orientation-insensitive communication. Moreover, IoT devices have operational bandwidth requirements and they operate at multiple frequency bands. Therefore, an antenna that can maintain radiation isotropy for a wide bandwidth is promi...
