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Related Concept Videos

Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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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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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Updated: Mar 12, 2026

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Controlling electromagnetic scattering with wire metamaterial resonators.

Dmitry S Filonov, Alexander S Shalin, Ivan Iorsh

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |November 10, 2016
    PubMed
    Summary

    Metamaterials reshape electromagnetic properties of scattering dipoles by hybridizing resonance with Fabry-Perot modes. This enables controlled scattering suppression and super-scattering, with applications across electromagnetic spectrum.

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    Area of Science:

    • Electromagnetism and Materials Science
    • Metamaterials and Wave Phenomena

    Background:

    • Antenna and scatterer properties are highly sensitive to their electromagnetic environment.
    • Metamaterials offer precise control over electromagnetic states and wave phenomena.
    • Artificial materials can be engineered to tailor electromagnetic characteristics.

    Purpose of the Study:

    • To analyze the electromagnetic properties of scattering dipoles within a wire medium metamaterial.
    • To investigate the influence of metamaterial geometry, dipole arrangement, and radiation frequency on scattering.
    • To demonstrate controlled scattering suppression and super-scattering using metamaterials.

    Main Methods:

    • Numerical simulations and experimental analysis were conducted.
    • Scattering dipoles were embedded within a wire medium metamaterial.
    • Studies focused on the GHz spectral range, exploring metamaterial geometry and dipole placement.

    Main Results:

    • Dipole resonance was shown to hybridize with Fabry-Perot modes of the metamaterial.
    • Complete reshaping of electromagnetic properties was achieved.
    • Experimental observation of controlled scattering suppression and super-scattering regimes.

    Conclusions:

    • Metamaterials can effectively govern wave phenomena and tailor scattering characteristics.
    • The hybridization of dipole resonance and metamaterial modes is key to property reshaping.
    • The demonstrated approach is scalable to optical and infrared spectral ranges.