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相关概念视频

Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

370
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...
370
Design Example01:23

Design Example

325
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...
325
Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

194
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...
194
Active Filters01:25

Active Filters

819
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
819

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相关实验视频

Updated: Jun 27, 2025

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
15:25

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一个过可重新配置的智能表面,用于无干扰的无线通信.

Jing Cheng Liang1,2, Lei Zhang1,2, Zhangjie Luo3,4

  • 1State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, 210096, China.

Nature communications
|May 7, 2024
PubMed
概括

这项研究引入了一种新的过可重新配置智能表面 (RIS),可以精确控制信号频率和相位. 这项创新通过允许选择性信号传输和减少干扰来增强无线通信.

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科学领域:

  • 电磁学 电磁学 电磁学 电磁学
  • 无线通信无线通信
  • 超材料是指一种超材料.

背景情况:

  • 可重新配置的智能表面 (RIS) 为无线通信提供了对电磁波的先进控制.
  • 现有的RIS设计的频率选择性很差,限制了它们在拥挤的频谱环境中的使用.

研究的目的:

  • 开发一个具有尖的频率选择性和2位相位转移能力的过RIS.
  • 为了能够灵活地操纵信号传播,并增强无线系统的抗干扰能力.

主要方法:

  • 一个过RIS原型的设计,制造和测量.
  • 使用散射参数和光束转向现象进行验证.
  • 无线通信实验以证明功能.

主要成果:

  • 过RIS具有强烈的频率选择性,在狭窄带内发送信号,同时拒绝带外信号.
  • 证明了2位数字相位转移,用于灵活的信号操纵.
  • 通过实验测量验证了高质量因子和相位转移特征.

结论:

  • 过RIS有效地执行无线信号操纵与反干扰功能.
  • 这项技术在推进下一代无线通信系统方面具有重大潜力.