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Related Concept Videos

Passive Filters01:27

Passive Filters

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 frequency...
Induced Electric Dipoles01:28

Induced Electric Dipoles

A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
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...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
Impedance Combination01:21

Impedance Combination

Consider a string of christmas lights, each bulb symbolizing an impedance element. In this series configuration, the flow of electric current remains uniform across every component. This behavior aligns with Kirchhoff's Voltage Law (KVL), which asserts that the total impedance in such a setup equals the sum of individual impedances—akin to resistors in series. It follows that the voltage from the power source is distributed proportionally among these components, adhering to the voltage division...

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Related Experiment Video

Updated: Jul 7, 2026

Investigating the Potential of Singly Curved Thin Piezoelectric Transducers for Energy Harvesting and Structural Health Monitoring
07:02

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A piezoelectric double-mode filter using the complex-branch-type energy trapping.

H Watanabe1, K Nakamura, H Shimizu

  • 1Fukushima Nat. Coll. of Technol., Iwaki.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1992
PubMed
Summary

This study introduces a novel piezoelectric double-mode filter utilizing complex-branch energy trapping. The innovative design offers unique characteristics for efficient signal filtering in electronic devices.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Acoustics

Background:

  • Piezoelectric filters are crucial components in electronic circuits.
  • Existing trapped-energy modes have limitations in certain applications.
  • Complex-branch-type energy trapping offers a new approach to filter design.

Purpose of the Study:

  • To propose and analyze a novel piezoelectric double-mode filter.
  • To investigate the unique characteristics of complex-branch-type energy trapping.
  • To demonstrate the practical application of this filter type.

Main Methods:

  • Theoretical analysis of complex-branch dispersion curves.
  • Experimental validation using thin piezoelectric ceramic strips.
  • Characterization of symmetric and antisymmetric trapped-energy modes.

Main Results:

  • Observed unique features in trapped-energy modes, including spectral undulations.
  • Demonstrated sinusoidal displacement decay in unelectroded regions.
  • Successfully constructed double-mode filters with specific center frequency and bandwidth.

Conclusions:

  • The proposed piezoelectric double-mode filter exhibits distinct and advantageous characteristics.
  • Complex-branch energy trapping provides a viable method for filter design.
  • These filters are suitable for medium frequency applications due to their size and support ease.