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Related Concept Videos

Active Filters01:25

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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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Design Example01:23

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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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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
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Magnetically programmable surface acoustic wave filters: device concept and predictive modeling.

Michael K Steinbauer1,2,3, Peter Flauger1,2, Matthias Küß4

  • 1University of Vienna, Faculty of Physics, Physics of Functional Materials, Vienna, Austria.

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Summary
This summary is machine-generated.

This study introduces a novel device for filtering surface acoustic wave (SAW) signals by controlling its internal magnetic state. The device demonstrates significant SAW transmission changes, paving the way for advanced signal processing applications.

Keywords:
EngineeringMaterials scienceNanoscience and technologyPhysics

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Surface acoustic wave (SAW) devices are crucial for signal processing.
  • Magnetostrictive materials offer potential for tunable SAW filtering.
  • Controlling magnetic states for SAW modulation is an active research area.

Purpose of the Study:

  • To propose and simulate a novel device for selective SAW attenuation.
  • To investigate the magnetoelastic interaction between SAW and spin waves (SWs) in Co/Ni islets.
  • To demonstrate SAW filtering by programming the internal magnetic state of the device.

Main Methods:

  • Micromagnetic simulations were performed to model the magnetoelastic interaction.
  • Rayleigh SAW mode and spin waves (SWs) in Co/Ni islets on LiTaO3 substrate were studied.
  • Finite-difference numerical calculations were used, extending prior analytical solutions.

Main Results:

  • A significant shift in SW dispersion was observed due to stray-field interactions between islets with perpendicular magnetic anisotropy.
  • The efficiency of magnetoelastic interaction was shown to change significantly with magnetic alignment.
  • Predicted SAW transmission changes of 52.0 dB/mm at 3.8 GHz were achieved based on the device's magnetic state.

Conclusions:

  • The proposed device enables selective SAW attenuation by programming its internal magnetic state, offering an alternative to external magnetic field control.
  • The findings highlight the potential for developing advanced tunable SAW filters for scientific and industrial applications.
  • The simulation methodology is extended for efficient modeling of complex magnetization patterns in such devices.