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Related Concept Videos

Frequency Response of a Circuit01:20

Frequency Response of a Circuit

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Inductive circuits present intriguing challenges in electrical engineering, particularly during the transition from the time domain to the frequency domain. This transformation involves converting inductors into impedances and utilizing phasor representation.
The transfer function is pivotal in characterizing how these circuits react to various frequencies, facilitating a profound understanding of their behavior. An essential parameter is the time constant, signifying the...
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Frequency Response of Op Amp Circuits01:20

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Operational amplifiers (op-amp) are used in signal conditioning, filtering, or for performing mathematical operations such as addition, subtraction, integration, and differentiation. The frequency response of an op-amp is an important aspect that describes how the gain of the amplifier varies with frequency.
Frequency Response and Gain:
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Frequency-dependent Selection01:21

Frequency-dependent Selection

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Related Experiment Video

Updated: Jan 4, 2026

Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
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Origami-Inspired Frequency Selective Surface with Fixed Frequency Response under Folding.

Deanna Sessions1, Alexander Cook2, Kazuko Fuchi3,4

  • 1Department of Electrical Engineering, Pennsylvania State University, University Park, PA 16801, USA.

Sensors (Basel, Switzerland)
|November 8, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a novel origami-based spatial filter that maintains consistent X-band frequency filtering despite physical reconfiguration. This innovation addresses challenges in reconfigurable filter design for improved signal processing.

Keywords:
Archimedean spiralMiura-oricircular polarizationdirect writefrequency selective surfacesorigami

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Area of Science:

  • Electromagnetics
  • Materials Science
  • Mechanical Engineering

Background:

  • Electromagnetic signal filtering is crucial for enhancing signal-to-noise ratios in various devices.
  • Maintaining filter performance during significant shape changes is difficult due to geometric dependencies.

Purpose of the Study:

  • To present an origami-based, reconfigurable spatial X-band filter with consistent frequency filtering capabilities.
  • To provide design guidelines for physically reconfigurable filters with sustained performance.

Main Methods:

  • Utilized direct-write additive manufacturing to print metallic Archimedean spiral elements in a lattice on a substrate.
  • Designed a lattice structure to maintain a target stop-band frequency through multiple fold angles.
  • Conducted combined design, modeling, fabrication, and experimental characterization.

Main Results:

  • Developed a reconfigurable spatial X-band filter using origami principles.
  • Demonstrated consistent frequency filtering performance across various fold angles.
  • Established a frequency selective surface acting as a stop-band filter.

Conclusions:

  • The developed origami-based filter successfully maintains consistent frequency filtering during reconfiguration.
  • The study provides valuable guidelines for designing future physically reconfigurable filters.
  • This approach offers a pathway to robust filter performance in dynamic systems.