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Related Concept Videos

Bandpass Sampling01:17

Bandpass Sampling

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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
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Related Experiment Video

Updated: Jan 28, 2026

Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique
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Switchable Bandpass/Bandstop Filter Using Liquid Metal Alloy as Fluidic Switch.

Eiyong Park1, Minjae Lee2, Sungjoon Lim3

  • 1School of Electrical and Electronics Engineering, College of Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea. rntqkdl9@naver.com.

Sensors (Basel, Switzerland)
|March 6, 2019
PubMed
Summary

This study introduces a novel switchable filter using liquid metal (eutectic gallium-indium) as a fluidic switch. This adaptable filter can function as either a bandpass filter or a bandstop filter for versatile RF applications.

Keywords:
bandpass filter (BPF)bandstop filter (BSF)liquid metalmicro-pumpswitchable

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Electromagnetics

Background:

  • Traditional filters often lack reconfigurability, limiting their application scope.
  • Developing tunable and switchable filters is crucial for modern wireless communication systems.

Purpose of the Study:

  • To propose and demonstrate a novel switchable band-pass/band-stop filter.
  • To utilize liquid metal alloy as a fluidic switch for filter reconfiguration.

Main Methods:

  • Design of a Chebyshev response filter using a three-stage quarter-wavelength resonant structure.
  • Implementation of a fluidic switch with eutectic gallium-indium (EGaIn) in microfluidic stubs made of polydimethylsiloxane (PDMS).
  • Control of the filter's mode (band-pass or bandstop) via micro-pump and microprocessor-actuated switching between short and open stubs.

Main Results:

  • The filter operates as a bandpass filter (BPF) with a center frequency of 2.5 GHz and a 1-dB bandwidth of 1.75–3.07 GHz, exhibiting low insertion loss (0.5 dB ± 0.4 dB).
  • In bandstop filter (BSF) mode, it achieves a 15-dB bandstop bandwidth of 2.4–2.65 GHz centered at 2.5 GHz.
  • Successful switching between BPF and BSF modes was achieved using the liquid metal fluidic switch.

Conclusions:

  • The proposed liquid metal fluidic switch enables effective reconfigurability for RF filters.
  • This technology offers a promising solution for developing adaptable and versatile filtering components in microwave engineering.