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Related Concept Videos

Transfer function and Bode Plots-II01:23

Transfer function and Bode Plots-II

328
In the standard form, the transfer function is shown in constant gain, poles/zeros at origin, simple poles/zeros, and quadratic poles/zeros; each contributing uniquely to the system's overall response. The term represents the magnitude of the simple zero:
328
Pole and System Stability01:24

Pole and System Stability

268
The transfer function is a fundamental concept representing the ratio of two polynomials. The numerator and denominator encapsulate the system's dynamics. The zeros and poles of this transfer function are critical in determining the system's behavior and stability.
Simple poles are unique roots of the denominator polynomial. Each simple pole corresponds to a distinct solution to the system's characteristic equation, typically resulting in exponential decay terms in the system's...
268
Frequency-Domain Interpretation of PD Control01:24

Frequency-Domain Interpretation of PD Control

102
Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
The proportional control gain, combined with the...
102
Bode Plots Construction01:24

Bode Plots Construction

688
The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):
688
Construction of Root Locus01:15

Construction of Root Locus

108
The construction of a root locus involves several key steps to analyze and visualize the behavior of a system's poles with varying gain. The number of branches in the root locus equals the number of closed-loop poles and is symmetrical about the real axis.
For positive gain values, the root locus exists on the real axis to the left of an odd number of finite open-loop poles or zeros. The root locus starts at the open-loop poles and traces the paths of the closed-loop poles as the gain...
108
Control System Problem01:21

Control System Problem

110
In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function.
When forming a closed-loop system, issues can arise if the poles cross into the unstable region, leading to potential...
110

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Updated: Jun 18, 2025

Extraction of the EPP Component from the Surface EMG
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Band-Stop Frequency-Selective Surface (FSS) with Elliptic Response Designed by the Extracted Pole Technique.

José R Montejo-Garai1, Juan E Page1, Gerardo Perez-Palomino1

  • 1Group of Applied Electromagnetics (GEA), Information Processing and Telecommunications Center, Universidad Politécnica de Madrid, 28040 Madrid, Spain.

Sensors (Basel, Switzerland)
|July 27, 2024
PubMed
Summary

This study presents an advanced design for Frequency-Selective Surfaces (FSSs) with precise elliptic band-stop responses. The validated method ensures accurate control over transmission zeros and attenuation for equiripple rejection filters.

Keywords:
band-stopextracted polefrequency-selective surface (FSS)spatial filtertransmission zerounit cell

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Area of Science:

  • Electromagnetics and Applied Physics
  • Metamaterials and Nanophotonics

Background:

  • Frequency-Selective Surfaces (FSSs) are crucial for controlling electromagnetic wave propagation.
  • Designing FSSs with specific band-stop responses, especially equiripple characteristics, presents significant challenges.
  • Existing methods may lack precise control over transmission zeros and attenuation levels.

Purpose of the Study:

  • To develop and validate an advanced synthesis design process for FSSs.
  • To achieve precise control over elliptic band-stop responses, including transmission zero placement and attenuation levels.
  • To enable the design of high-performance FSS filters meeting stringent specifications.

Main Methods:

  • Utilized the Generalized Chebyshev Function and extracted pole technique for systematic design.
  • Extracted lumped LC values from resonator circuits and impedance inverters.
  • Developed equivalent dipole and transmission line models for electromagnetic design.
  • Analyzed the impact of higher-order modes on the FSS electrical response.

Main Results:

  • Designed a fourth-order band-stop filter with a 3 GHz bandwidth centered at 30 GHz and 50 dB attenuation.
  • Investigated three implementations, including two in vacuum and one on a dielectric substrate.
  • Successfully manufactured and measured the dielectric substrate implementation, validating the design process.

Conclusions:

  • The developed synthesis design process effectively enables the creation of FSSs with desired elliptic band-stop responses.
  • The method provides precise control over filter characteristics, including equiripple behavior.
  • Experimental validation confirms the accuracy and applicability of the proposed design procedure for practical FSS filters.