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相关概念视频

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
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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.
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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.
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Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band
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紧的四端口MIMO天线使用双极化补丁和有缺陷的地面结构用于物联网设备.

Dat Tran-Huy1, Cuong Do-Manh1, Hung Pham-Duy1

  • 1Faculty of Electrical and Electronic Engineering, PHENIKAA University, Hanoi 12116, Vietnam.

Sensors (Basel, Switzerland)
|July 30, 2025
PubMed
概括

本研究介绍了用于物联网 (IoT) 设备的紧型四端口多输入多输出 (MIMO) 天线. 该设计使用双极化散热器和有缺陷的地面结构,以在小尺寸中实现高性能.

关键词:
存款保证金 (DGS) 是一种存款保证金.这就是"MIMO MIMO".紧紧的 紧的 紧的双极化补丁是双极化的补丁.

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科学领域:

  • 电气工程 电气工程
  • 天线理论天线理论
  • 无线通信无线通信

背景情况:

  • 物联网 (IoT) 设备需要越来越紧的天线.
  • 缩放传统的单极化天线,以实现多端口操作,导致更大的尺寸.
  • 物联网中的高通道容量需要像MIMO这样的多端口天线系统.

研究的目的:

  • 为物联网应用开发一个紧的四端口多输入多输出 (MIMO) 天线.
  • 为了在减少天线足迹的情况下实现多端口运行和高通道容量.
  • 为了最大限度地减少天线元件之间的相互合,以改善隔离.

主要方法:

  • 使用双极化散热器而不是单极化元件来减少尺寸.
  • 整合了一个I形有缺陷的地面结构 (DGS),以减轻相互合.
  • 设计和测量了一个具有特定尺寸的四端口MIMO天线在5.5GHz.

主要成果:

  • 在5.5 GHz实现了0.92 λ×0.73 λ×0.03 λ的紧天线尺寸.
  • 获得了大约2.2%的操作带宽.
  • 已证明隔离度优于20dB,峰值增益超过6.0dBi.

结论:

  • 拟议的双极化散热器和DGS方法可以为物联网提供紧,高性能的MIMO天线.
  • 该设计有效地减少了相互合,增强了端口之间的隔离.
  • 该方法具有可扩展性,适用于未来无线系统的大型MIMO阵列.