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相关概念视频

Lossless Lines01:23

Lossless Lines

In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi, exhibits...
Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx and a shunt capacitance CΔx.
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

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...
Bewley Lattice Diagram01:12

Bewley Lattice Diagram

The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
Orthogonal Trajectories01:26

Orthogonal Trajectories

Orthogonal trajectories describe the geometric relationship between two families of curves that intersect each other at right angles. One illustrative case involves a family of parabolas that open sideways along the x-axis. These curves share a common shape but differ by a scaling parameter, resulting in a set of curves that all pass through the origin and widen at different rates.Determining Orthogonal TrajectoriesTo identify the orthogonal trajectories for these parabolas, the first step...
Reflective Property of Parabolas01:26

Reflective Property of Parabolas

A parabola is a basic type of conic section that results from the intersection of a plane with a double-napped cone in a direction parallel to one of the cone's sides. This U-shaped curve has a distinctive reflective property: all incoming rays parallel to its axis of symmetry are directed toward a single point, known as the focus. This property is widely utilized in optical and communication technologies that require precise signal concentration.In analytic geometry, a parabola is defined as...

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相关实验视频

Updated: Jul 15, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

一条向负折射的性路径.

J B Pendry1

  • 1Department of Physics, Blackett Laboratory, Imperial College London, London SW7 2AZ, UK.

Science (New York, N.Y.)
|November 20, 2004
PubMed
概括

引入单一的奇拉共振简化了负折射材料. 这种方法可以实现对一个极化的负折射,改善设计,并使新的研究途径成为可能.

科学领域:

  • 物理 物理学 物理
  • 材料科学 材料科学 材料科学
  • 电磁主义 电磁主义

背景情况:

  • 负折射通常需要同时具有负磁透性和电容性.
  • 这就需要在材料内产生两种不同的共振,使设备设计复杂化.

研究的目的:

  • 调查单个性共振在实现负折射方面的潜力.
  • 探索负折射材料的简化设计.

主要方法:

  • 该研究在材料中引入了一个单一的奇拉共振.
  • 分析了不同的极化所产生的折射性能.

主要成果:

  • 一个单一的性共振被发现可以诱导一个特定的偏振的负折射.
  • 与传统方法相比,这种方法简化了设计要求.

结论:

  • 单体性共振为负折射提供了一个更有效,更简单的途径.
  • 这一发现开辟了超材料和光学领域的新研究方向.

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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相关实验视频

Last Updated: Jul 15, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

The Diffusion of Passive Tracers in Laminar Shear Flow
08:01

The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018