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Related Concept Videos

Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
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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:
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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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Characteristics of Series Resonant Circuit01:24

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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:
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Concept of Resonance and its Characteristics01:19

Concept of Resonance and its Characteristics

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If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
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Design Example01:23

Design Example

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Related Experiment Video

Updated: Feb 18, 2026

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Low-Frequency Model for Radio-Frequency Absorbers.

J Randa1

  • 1National Institute of Standards and Technology, Boulder, CO 80303.

Journal of Research of the National Institute of Standards and Technology
|November 21, 2017
PubMed
Summary
This summary is machine-generated.

A new simple model accurately characterizes low-frequency radio-frequency absorber behavior. This model aids in analyzing absorber-lined chambers and predicting shielded enclosure performance.

Keywords:
EMC modellingEMI/EMCabsorber modellingabsorbing wallsanechoic chambers

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Area of Science:

  • Electromagnetics
  • Materials Science

Background:

  • Radio-frequency (RF) absorbers are crucial for controlling electromagnetic wave propagation.
  • Accurate characterization of RF absorbers at low frequencies presents significant challenges.
  • Existing models may not fully capture the complex behavior of absorbers in this range.

Purpose of the Study:

  • To develop a simple, effective model for characterizing RF absorbers at low frequencies.
  • To provide a tool for analyzing absorber-lined chambers and shielded enclosures.
  • To determine effective constitutive parameters for lossy material slabs.

Main Methods:

  • Representing the RF absorber as a flat, homogeneous, isotropic slab of lossy material.
  • Utilizing effective constitutive parameters to describe the material's behavior.
  • Fitting the model to measured data to determine these parameters.

Main Results:

  • The developed model provides excellent fits to measured data in considered applications.
  • Effective constitutive parameters were successfully determined for the lossy material slab.
  • The model demonstrates strong predictive capability for low-frequency RF absorber behavior.

Conclusions:

  • The simple model effectively characterizes low-frequency RF absorber performance.
  • This model is suitable for the analysis of absorber-lined chambers.
  • It can also predict the low-frequency performance of partially loaded shielded enclosures.