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相关概念视频

Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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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...
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Properties of the z-Transform I

The z-transform is a fundamental tool in digital signal processing, enabling the analysis of discrete-time systems through its various properties. It is an invaluable tool for analyzing discrete-time systems, offering a range of properties that simplify complex signal manipulations. One fundamental property is linearity. For any two discrete-time signals, the z-transform of their linear combination equals the same linear combination of their individual z-transforms. This property is essential...
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相关实验视频

Updated: Jun 14, 2026

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实时可编程的特拉赫兹多功能波面工程的超表面.

Feng Lan1,2,3, Luyang Wang1, Hongxin Zeng4

  • 1Sichuan THz Communication Technology Engineering Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China.

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|August 7, 2023
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概括

研究人员使用化 (GaN) 开发了一种可重新配置的超表面,用于敏捷的特拉赫兹 (THz) 波面控制. 这项技术可以为未来的THz通信和传感系统提供快速光束形成和广角覆盖.

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科学领域:

  • 特拉赫兹 (THz) 技术的使用.
  • 超材料是指一种超材料.
  • 半导体器件是指半导体器件.

背景情况:

  • 太赫兹 (THz) 技术对于未来的通信和传感至关重要.
  • 敏捷工程的THz波线前沿是该领域的一个关键挑战.

研究的目的:

  • 描述一个可重新配置的元表面,用于精确的THz波浪前线控制.
  • 为了展示该设备在光束扫描,多光束生成和分散散射方面的功能.

主要方法:

  • 使用基于化 (GaN) 的超表面与数组子数组架构.
  • 采用1位数字编码序列用于次波长间隔阵列控制.
  • 在0.34 THz附近的频率上运行.

主要成果:

  • 实现了几乎任意的波浪前线控制.
  • 在70GHz带宽中展示了广角光束扫描 (1度精度).
  • 展示了多光束和分散波线生成,切换速度高达100MHz.

结论:

  • 开发的超表面使得THz波面的快速重新配置成为可能.
  • 这项技术促进了传感和成像的光束形成和广角扩散散射.
  • 该设备有可能推进THz传感,成像和网络应用.