70 citations · 168 across the 17 of their papers we have counts for
17 papers
Power- and time-dependent equivalent circuit models for waveform-selective metasurfaces with varying electromagnetic responses to repeated pulses at the same frequency
Ryuho Miyamoto, Hiroki Wakatsuchi
Waveform-selective metasurfaces offer unprecedented control over electromagnetic waves on the basis of pulse width. However, existing circuit models fail to capture the power-depen…
An Experimental Validation of Reconfigurable Intelligent Surfaces Achieving Pulse Width-Modulated Singular Reflection Angles Without External Power Sources
Eisuke Omori, Kairi Takimoto, Atsuko Nagata +3
In this study, we introduce a design concept that leverages pulse width variation to enable a reconfigurable intelligent surface (RIS) and to autonomously switch reflection propert…
Experimental validation of the diverse incident angle performance of a pulse-width-dependent antenna based on a waveform-selective metasurface in a reverberation chamber
Kaito Ozawa, Hiroki Wakatsuchi
We present experimental validation results of a pulse-width-dependent antenna based on a waveform-selective metasurface that behaves differently according to the incoming waveform,…
Multipath Signal-Selective Metasurface: Passive Time-Varying Interlocking Mechanism to Vary Spatial Impedance for Signals with the Same Frequency
Kaito Tachi, Kota Suzuki, Kairi Takimoto +4
Electromagnetic (EM) multipath interference is difficult to address with passive approaches due to two physical restrictions - the shared frequency of the initial and interfering s…
Experimental and Numerical Validation of Tape-Based Metasurfaces in Guiding High-Frequency Surface Waves for Efficient Power Transfer
K. Suzuki, P. T. Dang, H. Homma +5
We present an effective method for transmitting electromagnetic waves as surface waves with a tape-based metasurface design. This design incorporates silver square patches periodic…
Metasurface-Enabled Multifunctional Single-Frequency Sensors without External Power
Masaya Tashiro, Kosuke Ide, Kosei Asano +5
IoT sensors are crucial for visualizing multidimensional and multimodal information and enabling future IT applications/services such as cyber-physical space, digital twins, autono…
Inkjet printed intelligent reflecting surface (IRS) for indoor applications
Kairi Takimoto, Kazutomo Nakamura, Peter Njogu +7
A passive, low-cost, paper-based intelligent reflecting surface (IRS) is designed to reflect a signal in a desired direction to overcome non-line-of-sight scenarios in indoor envir…
Frequency-Hopping Wave Engineering with Metasurfaces
Hiroki Takeshita, Ashif Aminulloh Fathnan, Daisuke Nita +2
Wave phenomena can be artificially engineered by scattering from metasurfaces, which aids in the design of radio-frequency and optical devices for wireless communication, sensing,…
Design guidelines for the SPICE parameters of waveform-selective metasurfaces varying with the incident pulse width at a constant oscillation frequency
Shiori Imai, Haruki Homma, Kairi Takimoto +8
In this study, we numerically demonstrate how the response of recently reported circuit-based metasurfaces is characterized by their circuit parameters. These metasurfaces, which i…
Unsynchronized Reconfigurable Intelligent Surfaces with Pulse-Width-Based Design
Ashif Aminulloh Fathnan, Kairi Takimoto, Mizuki Tanikawa +3
In this correspondence, we present a reconfigurable intelligent surface (RIS) that reflects an incident signal to the desired direction, depending on the pulse width. This unique r…
Metasurface-Inspired Maintenance-Free IoT Tags Characterised in Both Frequency and Time Domains
Masaya Tashiro, Ashif Aminulloh Fathnan, Yuta Sugiura +2
We present metasurface-inspired maintenance-free IoT tags that can be characterised not only by frequency-domain profiles but also by time-domain profiles. In particular, time-doma…
Method for Extracting the Equivalent Admittance from Time-Varying Metasurfaces and Its Application to Self-Tuned Spatiotemporal Wave Manipulation
Ashif Aminulloh Fathnan, Haruki Homma, Shinya Sugiura +1
With their self-tuned time-varying responses, waveform-selective metasurfaces embedded with nonlinear electronics have shown fascinating applications, including distinguishing diff…
Pulse-Driven Self-Reconfigurable Meta-Antennas
Daiju Ushikoshi, Riku Higashiura, Kaito Tachi +11
Wireless communications and sensing have notably advanced thanks to the recent developments in both software and hardware. Although various modulation schemes have been proposed to…
Smart Radio Environments
Gabriele Gradoni, Marco Di Renzo, Ana Diaz-Rubio +27
This Roadmap takes the reader on a journey through the research in electromagnetic wave propagation control via reconfigurable intelligent surfaces. Meta-surface modelling and desi…
Pseudo-Waveform-Selective Metasurfaces and Their Limited Performance
Tomoyuki Nakasha, Sendy Phang, Hiroki Wakatsuchi
In recent years, metasurfaces composed of lumped circuit components, including nonlinear Schottky diodes, have been reported to be capable of sensing particular electromagnetic wav…
Simplified equivalent circuit approach for designing time-domain responses of waveform-selective metasurfaces
Kosei Asano, Tomoyuki Nakasha, Hiroki Wakatsuchi
In this study, we demonstrate simplified equivalent circuit models to effectively approximate responses of recently reported waveform-selective metasurfaces that distinguish differ…
Waveform Selective Surfaces
Hiroki Wakatsuchi, Jiang Long, Daniel F. Sievenpiper
The role of frequency is very important in electromagnetics since it may significantly change how a material interacts with an incident wave if the frequency spectrum varies. Here,…