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Related Concept Videos

Passive Filters01:27

Passive Filters

956
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...
956
Active Filters01:25

Active Filters

1.3K
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:
1.3K

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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A Dual-Layer Frequency Selective Surfaces with Tunable Transmission and Fixed Absorption Bands.

Zhiming Zhang1, Qingyang Wang1, Qiyuan Wang1

  • 1School of Information Engineering, Wuhan University of Technology, Wuhan 430070, China.

Materials (Basel, Switzerland)
|September 27, 2025
PubMed
Summary

This study introduces dual-layer frequency selective surfaces (FSSs) offering tunable L-band transmission and high-performance absorption. The design dynamically controls frequency division for versatile electromagnetic applications.

Keywords:
absorptionfrequency selective surfacetunable transmission

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Area of Science:

  • Electromagnetics and Metamaterials
  • Microwave Engineering
  • Applied Physics

Background:

  • Frequency selective surfaces (FSSs) are crucial for controlling electromagnetic wave propagation.
  • Existing FSS designs often lack dynamic tunability and multi-functional capabilities.
  • The need for advanced FSS with integrated transmission and absorption is growing in wireless communications.

Purpose of the Study:

  • To present a novel dual-layer FSS with integrated frequency division control.
  • To achieve a tunable transmission window in the L-band and high absorption in a higher frequency band.
  • To validate the design through simulations and measurements.

Main Methods:

  • A dual-layer FSS architecture was designed and fabricated.
  • The bottom FSS layer uses gradient gap square-ring elements with varactor diodes for tunable L-band transmission (1.26-1.9 GHz).
  • The top FSS layer employs a square-ring-cross-slot topology for absorption (5.56-5.72 GHz), utilizing bottom layer reflection and dielectric losses.

Main Results:

  • The L-band transmission window was successfully tuned from 1.26 GHz to 1.9 GHz with varactor modulation.
  • Insertion loss within the transmission window remained below 1.41 dB.
  • The structure achieved a peak absorption of approximately -30 dB in the 5.56-5.72 GHz band.

Conclusions:

  • The proposed dual-layer FSS effectively demonstrates frequency division control with tunable transmission and high absorption.
  • Measurement results closely agree with simulations, validating the design's performance.
  • This FSS offers a promising solution for advanced electromagnetic applications requiring frequency agility and absorption.