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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:
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Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

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Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
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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:
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Reconstruction of Signal using Interpolation01:10

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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
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Dispersion-engineered broadband frequency-selective rasorber without external lossy loads.

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    This study introduces a novel broadband frequency selective rasorber (FSR) design that eliminates the need for external lossy materials. By engineering spoof surface plasmon polaritons (SSPPs), the new FSR achieves high absorption and a tunable transmission band, overcoming limitations of conventional designs.

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    Area of Science:

    • Electromagnetics and Metamaterials
    • Applied Physics

    Background:

    • Conventional frequency selective rasorbers (FSRs) utilize frequency selective surfaces (FSS) combined with lossy layers.
    • External lossy materials in FSRs limit bandwidth, increase complexity, and reduce design flexibility.

    Purpose of the Study:

    • To develop a broadband FSR design free from external lossy media loading.
    • To explore the use of dispersion engineering of spoof surface plasmon polaritons (SSPPs) for FSR applications.

    Main Methods:

    • Dispersion engineering of SSPPs in a nested structure.
    • Tailoring fundamental and higher-order mode dispersion characteristics.
    • Fabrication and experimental testing of the designed FSR sample.

    Main Results:

    • The proposed FSR achieves over 80% absorptivity in two distinct frequency bands (6.85-10.55 GHz and 21.88-29.1 GHz).
    • A tunable -1 dB transmission band is achieved from 13.5 to 18.5 GHz.
    • The design successfully eliminates the reliance on external lossy loads.

    Conclusions:

    • A novel FSR design based on SSPP dispersion engineering is presented.
    • This approach offers a new paradigm for FSR design, overcoming limitations of conventional methods.
    • The findings provide valuable insights for future FSR development with enhanced performance and design flexibility.