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Related Concept Videos

Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

421
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.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
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Radial System Protection01:23

Radial System Protection

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Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...
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State Space Representation01:27

State Space Representation

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The frequency-domain technique, commonly used in analyzing and designing feedback control systems, is effective for linear, time-invariant systems. However, it falls short when dealing with nonlinear, time-varying, and multiple-input multiple-output systems. The time-domain or state-space approach addresses these limitations by utilizing state variables to construct simultaneous, first-order differential equations, known as state equations, for an nth-order system.
Consider an RLC circuit, a...
289
Node Analysis for AC Circuits01:14

Node Analysis for AC Circuits

375
Consider an angioplasty system featuring a catheter equipped with a turbine, a critical tool for removing plaque deposits from coronary arteries. This intricate medical device operates using a circuit model reminiscent of a dual-node RLC circuit powered by a current-controlled voltage source.
To unravel the complexities of this system, nodal analysis is employed, a powerful technique founded on Kirchhoff's current law (KCL), which remains valid for phasors. AC circuits can effectively be...
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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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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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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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RCS control method for phased array based on scattering mode cancellation network.

Chan Bai, Shuai Zhang, Zixuan Song

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    A novel method precisely controls radar cross-section (RCS) in phased arrays by canceling scattering modes. This technique optimizes scattering patterns while maintaining essential radiation performance, validated experimentally.

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    Area of Science:

    • Electromagnetics and Antennas
    • Metamaterials and Applied Electromagnetics

    Background:

    • Phased arrays are crucial in modern radar and communication systems.
    • Controlling the radar cross-section (RCS) is vital for stealth applications and reducing interference.
    • Existing methods often compromise radiation efficiency or lack precise scattering control.

    Purpose of the Study:

    • To propose a novel RCS control method for phased arrays based on a scattering mode cancellation network.
    • To achieve precise scattering regulation while preserving the array's radiation performance.
    • To enable arbitrary scattering pattern optimization and rapid RCS prediction.

    Main Methods:

    • Derivation of analytical relationships between load resistance, phase delay, antenna mode scattering field (AMSF), and structural mode scattering field (SMSF).
    • Rapid prediction of AMSF using derived formulas, avoiding computationally expensive full-wave simulations.
    • Synthesis of the total scattering field by combining SMSF and modulated AMSF for precise scattering cancellation.
    • Design of an impedance matching network to ensure port matching and maintain radiation performance.

    Main Results:

    • The proposed method precisely controls the RCS to target values at specific incidence angles or angular domains.
    • Demonstrated significant RCS reduction: -60 dBsm at normal incidence, -50 dBsm at oblique incidence.
    • Achieved RCS below -40 dBsm across the entire angular domain for an 8-element linear array.
    • Experimental validation confirmed numerical results, showing preserved radiation performance.

    Conclusions:

    • The scattering mode cancellation network offers an effective approach for precise RCS control in phased arrays.
    • The method successfully balances scattering reduction with the preservation of radiation characteristics.
    • Validated through fabrication and experimentation, the technique shows practical applicability for stealth and interference management.