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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...
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:
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Echo01:06

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...
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:
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:

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Observation of Nonlinear Harmonic Generation of Bulk Modes in SAW Devices.

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Measurement and FEM/BEM simulation of transverse effects in SAW resonators on lithium tantalate.

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Fabrication and Characterization of Superconducting Resonators
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Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

A SAW resonator with two-dimensional reflectors.

Marc Solal1, Julien Gratier, Taeho Kook

  • 1TriQuint Semiconductor, Apopka, FL, USA. marc.solal@tqs.com

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|December 31, 2009
PubMed
Summary

Researchers developed a new surface acoustic wave (SAW) resonator using phononic crystals. This novel design significantly enhances the resonator

Area of Science:

  • Materials Science
  • Acoustics
  • Nanotechnology

Background:

  • Leaky surface acoustic wave (SAW) resonators suffer energy loss through acoustic radiation into bus-bars.
  • Phononic crystals offer potential solutions for wave confinement and reflection.
  • Existing SAW resonator technology faces limitations in performance, particularly with narrow apertures.

Purpose of the Study:

  • To propose and experimentally validate a novel SAW resonator design incorporating a 2-D phononic crystal reflector grating.
  • To investigate the impact of reflector arrangements and geometries on resonator performance.
  • To address acoustic energy leakage and parasitic effects in narrow-aperture SAW resonators.

Main Methods:

  • Fabrication of a new SAW resonator device by superimposing a regular resonator with a 2-D periodic reflector grating.

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
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Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

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Fabrication and Characterization of Superconducting Resonators
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
09:46

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

Published on: August 8, 2025

  • Experimental comparison of various reflector arrangements and geometries using 48 degrees rotated Y-cut lithium tantalate.
  • Manufacturing and testing of a narrow-aperture (7.5 lambda) resonator in the 900 MHz range.

    • Main Results:

    • The new device achieved a resonance Q factor of 1100, a significant improvement over the standard technology's Q of 575 for a narrow-aperture resonator.
    • The proposed design drastically reduced parasitic effects in the admittance above the resonance frequency, particularly noticeable in narrow-aperture devices.
    • Performance characteristics, other than the Q factor, remained undegraded in the new device.

    Conclusions:

    • The integration of a 2-D phononic crystal reflector grating with SAW resonators is a feasible and effective approach to mitigate acoustic energy loss.
    • This novel design significantly enhances the quality factor (Q) and reduces parasitic effects, especially in miniaturized resonators.
    • The study demonstrates a promising pathway for developing high-performance SAW devices for various applications.