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Related Concept Videos

Active Filters01:25

Active Filters

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:
Passive Filters01:27

Passive Filters

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 frequency...

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Related Experiment Video

Updated: May 8, 2026

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
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Tunable High-Performance Metamaterial Filters Based on Novel SRR Architectures.

Lingxi Qu1, Liya Zheng1, Ruopeng Liu2

  • 1School of Materials, Shenzhen Campus of Sun Yat-Sen University, Shenzhen, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 7, 2026
PubMed
Summary

Novel metamaterial filters offer high transmittance and low reflection using ultra-thin ceramic substrates. These tunable passband filters demonstrate efficient electromagnetic wave transmission for advanced applications.

Keywords:
3D printingbandpass filterselectromagnetic filtering mechanismsmetamaterials

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Area of Science:

  • Materials Science
  • Electromagnetism
  • Applied Physics

Background:

  • Metamaterials possess unique electromagnetic properties and lightweight characteristics, making them suitable for applications demanding high electromagnetic interference resistance and maneuverability.
  • Existing metamaterial filters often face limitations in tunability, thickness, or efficiency.

Purpose of the Study:

  • To design and fabricate novel tunable passband metamaterial filters with ultra-thin ceramic substrates.
  • To investigate the electromagnetic wave transmission and filtering mechanisms of these metamaterials.
  • To assess the potential of these metamaterials for precise signal transmission and enhanced mobility in lightweight systems.

Main Methods:

  • Combines simulation and experimental approaches for metamaterial filter design and fabrication.
  • Utilizes ultra-thin ceramic substrates for reduced thickness and weight.
  • Analyzes filtering mechanisms, including capacitive gain and capacitive-inductive impedance matching.

Main Results:

  • Four novel tunable passband metamaterial filters were successfully designed and fabricated.
  • The SM-2 model achieved over 97% electromagnetic wave transmittance and less than 0.017% surface reflectance at resonance.
  • The SM-2 model maintained a relative thickness of 0.06 λL, and SM-1 showed a passband coverage of nearly 70% through unit cell geometry adjustments.
  • Two distinct filtering mechanisms were identified, enabling efficient, low-loss electromagnetic energy transmission.

Conclusions:

  • The developed metamaterial filters exhibit excellent performance in terms of transmittance, reflectance, and thickness.
  • The tunable nature and identified filtering mechanisms highlight their potential for advanced electromagnetic filtering systems.
  • These metamaterials are promising for applications requiring precise signal transmission and enhanced mobility in lightweight systems.