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Related Concept Videos

Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
299
Parallel RLC Circuits01:14

Parallel RLC Circuits

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Street lamps equipped with RLC surge protectors are an excellent example of applying circuit analysis in practical scenarios. These surge protectors safeguard the lamp's components against sudden voltage spikes.
A simplified parallel RLC circuit model with a DC input source generating a step response is employed in this context. When the switch is turned on, Kirchhoff's current law is applied, leading to a second-order differential equation.
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Series RLC Circuit without Source01:21

Series RLC Circuit without Source

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Within the field of electrical circuits, source-free RLC circuits present an intriguing domain. These circuits comprise a series arrangement of a resistor, inductor, and capacitor, operating independently of external energy sources. Their initiation hinges upon utilizing the initial energy stored within the capacitor and inductor to instigate their functionality. Their mathematical equation, a second-order differential equation, sets these circuits apart. This equation captures how the...
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RLC Series Circuits: Introduction01:25

RLC Series Circuits: Introduction

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Consider an RLC series circuit consisting of a resistor, an inductor, and a capacitor connected to an AC voltage source. A current, which varies sinusoidally over time, flows through the circuit, and this can be expressed by the following equation:  
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RLC Series Circuits01:30

RLC Series Circuits

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An RLC series circuit comprises an inductor, a resistor, and a charged capacitor connected in series. When the circuit is closed, the capacitor begins to discharge through the resistor and inductor by transferring energy from the electric field to the magnetic field. Here, the resistor connected to the circuit causes energy losses; therefore, on the complete discharge of the capacitor, the magnetic field energy acquired by the inductor is less than the original electric field energy of the...
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Parallel Resonance01:23

Parallel Resonance

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
255

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Updated: Aug 25, 2025

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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Wideband RCS Reduction by Single-Layer Phase Gradient Modulated Surface.

Yousef Azizi1, Mohammad Soleimani1, Seyed-Hasan Sedighy2

  • 1Department of Electrical Engineering, Iran University of Science & Technology, Tehran 1684613114, Iran.

Sensors (Basel, Switzerland)
|October 14, 2022
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Summary

This study presents a novel single-layer modulated surface (MS) for broadband radar cross-section reduction (RCSR). The design utilizes sinusoidal gap modulations for enhanced bandwidth, validated through simulations and measurements.

Keywords:
modulated surfacephase gradientradar cross section reduction

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Area of Science:

  • Electromagnetics and Applied Physics
  • Materials Science and Engineering

Background:

  • Radar cross-section reduction (RCSR) is crucial for stealth technology.
  • Existing RCSR solutions often involve complex, multi-layered structures.
  • Broadband performance remains a significant challenge in RCSR design.

Purpose of the Study:

  • To design and fabricate a simple, single-layer broadband modulated surface (MS) for effective radar cross-section reduction (RCSR).
  • To investigate the impact of sinusoidal modulation gap sizes on RCSR performance.
  • To validate the proposed design through comprehensive simulations and experimental measurements.

Main Methods:

  • Design of a single-layer MS with square patch (SP) unit cells featuring varying sinusoidal gap sizes.
  • Utilizing a genetic algorithm (GA) for performance optimization.
  • Fabrication of the MS on a RO4003C substrate.
  • Experimental validation using mono- and bi-static measurements for TM and TE polarizations at oblique incidences.

Main Results:

  • Achieved broadband RCSR over a 97% frequency range (11.3-32.3 GHz).
  • Demonstrated effective phase gradient generation through modulated gap sizes, enhancing bandwidth.
  • Exhibited good agreement between simulated and measured results, confirming design validity.

Conclusions:

  • The proposed unpretentious, single-layer MS effectively achieves broadband radar cross-section reduction.
  • Sinusoidal modulation of gap sizes is a viable technique for enhancing RCSR bandwidth.
  • The design criteria and fabrication method are validated by experimental results.