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Related Concept Videos

Passive Filters01:27

Passive Filters

452
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...
452
Active Filters01:25

Active Filters

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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

Design Example

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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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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

855
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:
855
Scaling01:26

Scaling

228
In designing and analyzing filters, resonant circuits, or circuit analysis at large, working with standard element values like 1 ohm, 1 henry, or 1 farad can be convenient before scaling these values to more realistic figures. This approach is widely utilized by not employing realistic element values in numerous examples and problems; it simplifies mastering circuit analysis through convenient component values. The complexity of calculations is thereby reduced, with the understanding that...
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Updated: May 31, 2025

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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Tunable Filters Using Defected Ground Structures at Millimeter-Wave Frequencies.

Kaushik Annam1, Birhanu Alemayehu1, Eunsung Shin1

  • 1Center of Excellence for Thin-Film Research and Surface Engineering (CETRASE), Department of Electrical and Computer Engineering, University of Dayton, Dayton, OH 45469, USA.

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|January 25, 2025
PubMed
Summary

This study integrates phase change materials (PCMs) with defected ground structures (DGS) to dynamically tune band stop filters. This approach enables significant frequency response adjustments for advanced microwave applications.

Keywords:
BST tunable filtersGeTe tunable filtersdefected ground structure (DGS)dumbbell u-slotfrequency tuninghigh-power filtersphase change material (PCM)reconfigurable devicestunable band stop filterstunable filters

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Microwave Engineering

Background:

  • Defected Ground Structures (DGS) are crucial for filtering in microwave circuits.
  • Barium Strontium Titanate (BST) thin films offer high dielectric properties for DGS design.
  • Dynamic frequency tuning remains a challenge in conventional band stop filters.

Purpose of the Study:

  • To explore the use of phase change materials (PCMs) for dynamic frequency tuning of DGS-based band stop filters.
  • To investigate the impact of BST thin films and PCM integration on filter performance.
  • To achieve significant frequency shifts and wide tuning ranges in DGS filters.

Main Methods:

  • Design of dumbbell u-slot DGS using co-planar waveguide (CPW) on BST thin film.
  • Integration of Germanium Telluride (GeTe) PCM layer for tunable electrical properties.
  • Simulation and experimental validation of filter performance and frequency tunability.

Main Results:

  • Cascaded two-unit cell DGS achieved a notch depth of -39.64 dB at 27.75 GHz.
  • Single DGS cell with PCM showed a 7.32% frequency tuning range (2.25 GHz shift).
  • Cascaded two DGS cells with PCM achieved a 12.04% tuning range (3.25 GHz shift).

Conclusions:

  • Phase change materials offer a viable method for dynamic frequency tuning of DGS band stop filters.
  • The proposed BST and PCM integrated DGS demonstrates excellent tunability and performance.
  • This technology holds promise for reconfigurable microwave and RF systems.