4 research outputs found
Design guidelines for the SPICE parameters of waveform-selective metasurfaces varying with the incident pulse width at a constant oscillation frequency
In this study, we numerically demonstrate how the response of recently
reported circuit-based metasurfaces is characterized by their circuit
parameters. These metasurfaces, which include a set of four diodes as a full
wave rectifier, are capable of sensing different waves even at the same
frequency in response to the incident waveform, or more specifically the pulse
width. This study reveals the relationship between the electromagnetic response
of such waveform-selective metasurfaces and the SPICE parameters of the diodes
used. First, we show that reducing a parasitic capacitive component of the
diodes is important for realization of waveform-selective metasurfaces in a
higher frequency regime. Second, we report that the operating power level is
closely related to the saturation current and the breakdown voltage of the
diodes. Moreover, the operating power range is found to be broadened by
introducing an additional resistor into the inside of the diode bridge. Our
study is expected to provide design guidelines for circuit-based
waveform-selective metasurfaces to select/fabricate optimal diodes and enhance
the waveform-selective performance at the target frequency and power level.Comment: 9 pages, 9 figure
Inkjet printed intelligent reflecting surface for indoor applications
Abstract 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 environments. The IRS is fabricated using conductive silver ink printed on paper with a specific nanoparticle arrangement, yielding a cost‐effective paper‐based IRS that can easily be mass‐produced. Full‐wave numerical simulation results were consistent with measurement results, demonstrating the IRS's ability to reflect incident waves into a desired nonspecular direction based on the inkjet‐printed design and materials
Design and analysis for the SPICE parameters of waveform-selective metasurfaces varying with the incident pulse width at a constant oscillation frequency
Abstract In this study, we numerically demonstrate how the response of recently reported circuit-based metasurfaces is characterized by their circuit parameters. These metasurfaces, which include a set of four diodes as a full wave rectifier, are capable of sensing different waves even at the same frequency in response to the incident waveform, or more specifically the pulse width. This study reveals the relationship between the electromagnetic response of such waveform-selective metasurfaces and the SPICE parameters of the diodes used. In particular, we draw conclusions about how the SPICE parameters are related to (1) the high-frequency operation, (2) input power requirement and (3) dynamic range of waveform-selective metasurfaces with supporting simulation results. First, we show that reducing a parasitic capacitive component of the diodes is important for realization of the waveform-selective metasurfaces in a higher frequency regime. Second, we report that the operating power level is closely related to the saturation current and the breakdown voltage of the diodes. Moreover, the operating power range is found to be broadened by introducing an additional resistor into the inside of the diode bridge. Our study is expected to provide design guidelines for circuit-based waveform-selective metasurfaces to select/fabricate optimal diodes and enhance the waveform-selective performance at the target frequency and power level. Our results are usefully exploited to ensure the selectivity based on the pulse duration of the incident wave in a range of potential applications including electromagnetic interference, wireless power transfer, antenna design, wireless communications, and sensing