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相关概念视频

Design Example01:23

Design Example

330
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...
330
Cascaded Op Amps01:16

Cascaded Op Amps

636
Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
636
Bewley Lattice Diagram01:12

Bewley Lattice Diagram

659
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.
659
Bandpass Sampling01:17

Bandpass Sampling

183
In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
183
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

778
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.
778

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相关实验视频

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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多层博洛米特结构,用于高效的宽带通信信号接收.

Anna V Bogatskaya1,2, Nikolay V Klenov1,3,4, Alexander M Popov1,2

  • 1Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia.

Nanomaterials (Basel, Switzerland)
|January 22, 2024
PubMed
概括
此摘要是机器生成的。

这项研究表明多层元材料如何提高博洛米特对宽带电磁信号的灵敏度. 这些结构作为共振器格子,扩大频段,以有效吸收能量.

关键词:
在等离子体中吸收电磁辐射的吸收.博洛米特 (bolometer) 是一个测量仪.电介电共振器的电介电共振器宽带通信 宽带通信

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科学领域:

  • 物理 物理学 物理
  • 材料科学 材料科学 材料科学
  • 电气工程 电气工程

背景情况:

  • 在导电板后面的介电共振器增强了波罗米特在共振频率附近的灵敏度.
  • 超材料为操纵电磁波提供了新的方法.

研究的目的:

  • 为了证明多层博洛米特超材料的宽带电磁信号接收能力.
  • 为了研究使用交替导电和介电层来增强能量吸收.

主要方法:

  • 实验性制造和多层博洛米特元材料的表征.
  • 在结构中的电磁波吸收的数值建模和模拟.
  • 实验数据与数值结果的比较.

主要成果:

  • 多层结构作为共振器的网格,显著扩大有效的吸收频率带.
  • 介电和半导体层的参数决定了特定的频段.
  • 数字建模显示与实验结果有很好的定性一致.

结论:

  • 多层玻利米度元材料有效地接收宽带电磁信号.
  • 这种方法增强了波力测系统中电磁信号的共振吸收.
  • 这项研究验证并扩展了对共振吸收技术的先前工作.