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Related Concept Videos

Sound Waves: Resonance01:14

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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:
Resonance in an AC Circuit01:26

Resonance in an AC Circuit

The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...
Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Concept of Resonance and its Characteristics01:19

Concept of Resonance and its Characteristics

If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not immune...
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:

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Related Experiment Video

Updated: Jul 7, 2026

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
06:51

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

Published on: August 21, 2018

Phase-shifted surface-acoustic-wave resonator.

B Kantor1, S Zehavi, J Salzman

  • 1Dept. of Electr. Eng., Technion-Israel, Haifa.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

Researchers studied surface-acoustic-wave (SAW) intensity in phase-shifted resonators. A pi/2 shift enables highly confined SAW modes, experimentally verified in lithium niobate, achieving a concentration factor of ~10.

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Surface-acoustic-wave (SAW) devices are crucial for signal processing.
  • Understanding SAW intensity distribution is key for device optimization.
  • Phase-shifted resonators offer unique wave-confining properties.

Purpose of the Study:

  • To investigate the spatial distribution of SAW intensity in phase-shifted transducer-resonators.
  • To determine if phase shifts can enhance SAW confinement.
  • To experimentally validate theoretical predictions of SAW confinement.

Main Methods:

  • Utilized a coupled-mode analysis to model the phase-shifted resonator.
  • Performed experimental measurements of SAW intensity.
  • Employed lithium niobate (LiNbO3) substrates for resonator fabrication.

Main Results:

  • A coupled-mode analysis predicted highly confined SAW modes in pi/2 shifted resonators.
  • Experimental verification confirmed the excitation of confined modes in a LiNbO3 pi/2 shifted resonator.
  • A concentration factor of approximately 10 was achieved for SAW intensity.

Conclusions:

  • Phase-shifted resonators, specifically with a pi/2 shift, can effectively confine SAW intensity.
  • Experimental results support the theoretical prediction of enhanced SAW confinement.
  • The findings are significant for developing advanced SAW devices with improved performance.