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Related Concept Videos

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:
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...
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:
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...
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...
Active Filters01:25

Active Filters

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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Related Experiment Video

Updated: Jul 7, 2026

Fabrication and Characterization of Superconducting Resonators
10:26

Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

A SAW resonator filter using longitudinal and transverse modes.

G Martin1, B Wall

  • 1Inst. fuer Festkoerper- und Werkstofforschung, Dresden.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 6, 2008
PubMed
Summary

This study introduces a novel Surface Acoustic Wave (SAW) resonator filter design utilizing both transverse and longitudinal modes. The innovative approach enables the creation of advanced four-pole filters without complex cascading or parallel connections.

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Acoustics

Background:

  • Surface Acoustic Wave (SAW) devices are crucial for signal filtering.
  • Traditional SAW filters often require complex configurations like cascading or parallel connections.
  • Utilizing longitudinal modes in SAW resonators offers potential for simplified filter designs.

Purpose of the Study:

  • To present a novel Surface Acoustic Wave (SAW) resonator filter design.
  • To demonstrate a method for constructing four-pole filters without cascading or parallel connections.
  • To suppress unwanted longitudinal modes through transducer design.

Main Methods:

  • Design of a SAW resonator filter incorporating both transverse and longitudinal modes.
  • Development of unsymmetrical withdrawing weighting for input and output transducers.
  • Application of an iterative procedure to determine transducer weighting for mode suppression.
  • Experimental fabrication and measurement of the proposed filter device.

Main Results:

  • Successful construction of a four-pole SAW resonator filter.
  • Demonstration of filter performance without cascading or parallel connections.
  • Effective suppression of neighboring disturbing longitudinal modes.
  • Validation of the design principle through experimental measurements.

Conclusions:

  • The presented design principle is effective for creating advanced SAW resonator filters.
  • Unsymmetrical transducer weighting is key to suppressing longitudinal modes.
  • This approach simplifies filter construction and potentially improves performance.