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相关概念视频

Design Example01:23

Design Example

316
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...
316
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
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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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Electromagnetic Fields01:30

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Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
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相关实验视频

Updated: Jun 5, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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对于多通道电磁控制的多频振幅可编程元表面.

Rui Yuan Wu1,2, Shi He1,2, Jun Wei Wu1,2

  • 1Institute of Electromagnetic Space, Southeast University, Nanjing 210096, China.

Nanophotonics (Berlin, Germany)
|December 5, 2024
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概括

这项研究介绍了一种可编程多频振幅 (MFAP) 的超表面,用于先进的电磁数据操纵. 这种可编程的超表面能够独立地实时控制跨多个频道的振幅信号.

关键词:
控制幅度的控制幅度.多频多频的频率.可编程的地表变量.

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Last Updated: Jun 5, 2025

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科学领域:

  • 电磁学 电磁学 电磁学 电磁学
  • 材料科学 材料科学 材料科学

背景情况:

  • 传统的超表面对电磁波 (EM) 提供有限的实时控制.
  • 数字和可编程的超表面提供了信息和物理之间的增强协作.
  • 复杂的实时控制是需要先进的EM波操纵.

研究的目的:

  • 提出一种新的多频振幅可编程 (MFAP) 地表.
  • 为了在多个频道中实现反射幅度 (高/低) 的同时独立编码.
  • 为了证明灵活的多功能EM操作与频率.

主要方法:

  • 多频振幅可编程 (MFAP) 超表面的设计.
  • 使用正方形分割环元原子与瓦拉克特二极管进行振幅控制.
  • 在金属结构上切换变频器以修改每个频道的振幅代码.

主要成果:

  • 在多个频道中实现了同时和独立的振幅编码 (高/低).
  • 证明了独特的振幅编码,可以控制反射系数和辐射模式.
  • 通过模拟和测量双通道原型的验证MFAP超表面功能.

结论:

  • 拟议的MFAP超表面通过复杂的空间编码提供精确的EM功率操纵.
  • 能够实现创新的通信系统,通过单独的信号传输跨通道.
  • 通过结合频道来实现先进的EM数据处理来促进多位传输.