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Related Concept Videos

Passive Filters01:27

Passive Filters

521
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...
521
Active Filters01:25

Active Filters

787
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:
787
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

873
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
873
Clipper Circuit01:18

Clipper Circuit

355
A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
355

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Bi-Stable Metamaterials with Intrinsic Memory for Selective Wave Filtering Based on Frequency and Amplitude.

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  • 1School of Mechanical, Aerospace, and Manufacturing Engineering, University of Connecticut, Storrs, CT, 06269, USA.

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Summary
This summary is machine-generated.

Metamaterials can control harmonic waves by switching between two stable phases. This phase transition enables tunable amplitude and frequency control, useful for advanced acoustic devices.

Keywords:
acoustic metamaterialsbistabllityharmonic wavesprogrammable materialssolitons

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Area of Science:

  • Acoustics
  • Materials Science
  • Wave Physics

Background:

  • Metamaterials offer unique wave manipulation capabilities.
  • Controlling harmonic waves based on amplitude and frequency is crucial for advanced acoustic applications.

Purpose of the Study:

  • To investigate the use of metamaterials for controlling harmonic waves.
  • To explore the mechanism of phase transition in bi-stable metamaterials for wave control.

Main Methods:

  • Analytical, numerical, and experimental investigations.
  • Programming metamaterials to support bi-stable configurations.
  • Analyzing the nucleation of transition waves (topological solitons) under harmonic excitation.

Main Results:

  • Demonstrated phase transition in metamaterials for wave control.
  • Achieved tunable control of harmonic wave amplitude and frequency.
  • Implemented a tunable low/high-pass filter using phase-changing metamaterials.
  • Observed phase transitions that preserve attenuation or transmission states, indicating memory effects.

Conclusions:

  • Bi-stable metamaterials provide a novel platform for controlling harmonic waves.
  • Phase transitions in metamaterials can be harnessed for tunable filtering and wave manipulation.
  • These metamaterials exhibit memory, enabling them to record extreme events, paving the way for advanced acoustic devices.