Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

146
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
146
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

158
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
158
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

246
Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
246

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Bioinspired "liquid-solid" biphasic dressing with exudate-gating transport, defense-attack antibacterial activity, and anti-adhesion property for exuding infected wound therapy.

Bioactive materials·2026
Same author

Dual-function polarization-selective metagrating for electromagnetic wave control.

Optics express·2025
Same author

Corrigendum to: Janus metagrating for tailoring direction-dependent wavefronts.

Nanophotonics (Berlin, Germany)·2025
Same author

1D Nanofiber-2D Nanosheet Assembled 3D Bioinspired Dressings for Treating Exuding Infected Wounds.

ACS applied materials & interfaces·2025
Same author

Reconfigurable leaky Fourier surfaces for customized beamforming and scanning.

Optics express·2025
Same author

Janus metagrating for tailoring direction-dependent wavefronts.

Nanophotonics (Berlin, Germany)·2025

Related Experiment Video

Updated: Oct 5, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

6.4K

Broadband tunable metasurface platform enabled by dynamic phase compensation.

Chunsheng Guan, Rui Feng, Badreddine Ratni

    Optics Letters
    |February 1, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a reconfigurable metasurface that dynamically compensates for chromatic aberrations in microwave systems. This breakthrough enables aberration-free beam bending and hologram imaging for advanced communication and sensing applications.

    More Related Videos

    Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
    15:25

    Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

    Published on: February 4, 2018

    6.3K
    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
    08:39

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

    Published on: January 28, 2019

    9.9K

    Related Experiment Videos

    Last Updated: Oct 5, 2025

    Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
    09:33

    Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

    Published on: June 7, 2019

    6.4K
    Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
    15:25

    Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

    Published on: February 4, 2018

    6.3K
    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
    08:39

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

    Published on: January 28, 2019

    9.9K

    Area of Science:

    • Metasurfaces and metamaterials
    • Electromagnetics and wave phenomena
    • Microwave engineering

    Background:

    • Broadband metasurfaces are crucial for imaging and communication but suffer from chromatic aberrations.
    • Chromatic aberrations limit the performance of metasurface devices across a wide frequency band.
    • Dynamic phase control is needed to overcome these limitations.

    Purpose of the Study:

    • To propose a method for alleviating chromatic aberrations in the microwave region.
    • To demonstrate dynamic phase compensation using a reconfigurable metasurface.
    • To enable aberration-free functionalities for broadband applications.

    Main Methods:

    • Implementing meta-atoms with varactor diodes for electronic manipulation of dispersion characteristics.
    • Utilizing dynamic phase compensation to correct dispersion-induced phase distortions.
    • Fabricating a prototype and performing near-field measurements for validation.

    Main Results:

    • Achieved dynamic electronic control over meta-atom dispersion.
    • Demonstrated aberration-free beam bending and hologram imaging.
    • Experimental results showed good agreement with simulation predictions.

    Conclusions:

    • The proposed reconfigurable metasurface effectively compensates for chromatic aberrations.
    • This active metasurface platform enables broadband, aberration-free functionalities.
    • The technology is promising for wireless power transfer, sensors, and advanced antenna systems.