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Related Concept Videos

Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Design Example01:23

Design Example

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

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Deep neural network-enabled dual-functional wideband absorbers.

Jing Li1,2,3,4,5, BinYi Ma1,3,4,5, Huanyang Chen2

  • 1School of Instrument and Electronics, North University of China, Taiyuan, 030051, China.

Scientific Reports
|October 25, 2024
PubMed
Summary

Researchers developed a novel dual-function terahertz metamaterial absorber using graphene and vanadium dioxide. This device offers switchable and tunable wideband perfect absorption, crucial for advanced THz applications.

Keywords:
Deep neural networks (DNN)Dual-functionDual-widebandMetamaterial absorber

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Area of Science:

  • Metamaterials
  • Terahertz (THz) Technology
  • Nanophotonics

Background:

  • Growing demand for switchable and tunable wideband perfect absorbers in THz applications like modulation, energy harvesting, and spectroscopy.
  • Existing absorbers often lack dual-functionality (switching and tuning) or broad bandwidth.
  • Metamaterials offer a promising platform for designing novel electromagnetic devices.

Purpose of the Study:

  • To present a dual-function terahertz metamaterial absorber capable of switchable and tunable wideband perfect absorption.
  • To demonstrate the device's performance using simulations supported by deep neural networks (DNN).
  • To explore potential applications in THz technology.

Main Methods:

  • Design and simulation of a terahertz metamaterial absorber incorporating graphene and vanadium dioxide (VO₂).
  • Utilizing deep neural networks (DNN) for analysis and support.
  • Investigating the absorber's response in different VO₂ phases (insulating and metallic) and varying graphene Fermi levels.

Main Results:

  • Achieved dual-wideband perfect absorption (>90%) in both insulating (9.31–9.77 THz, 61.3% fractional bandwidth) and metallic (8.44–9.75 THz, 174.6% fractional bandwidth) phases of VO₂.
  • Demonstrated continuous electrical tuning of absorption intensity (48–100%) by modulating graphene's Fermi level.
  • Exhibited polarization insensitivity to TE and TM waves across a broad incidence angle due to symmetric design.

Conclusions:

  • The proposed dual-function THz metamaterial absorber effectively achieves switchable and tunable wideband perfect absorption.
  • The design shows significant potential for diverse THz applications including switching, electromagnetic shielding, stealth technology, filtering, and sensing.
  • Integration with DNNs provides a powerful approach for analyzing and optimizing such advanced metamaterial devices.