相关实验视频
Updated: Aug 12, 2026

08:21
Wideband Optical Detector of Ultrasound for Medical Imaging Applications
Published on: May 11, 2014
11.4K
频率方向式超宽带准真实时间延迟光束变频器,用于集成传感和通信
Mian Wang1, Wenxin Zhang1, Zeyu Ren1
1Department of Electronic Engineering, Beijing National Research Center for Information Science and Technology, Tsinghua University, Beijing, China.
Nature communications
|August 14, 2025
概括
本研究介绍了一种光子准真实时间延迟束形态方法,用于超宽带相位阵列天线 (PAA). 它可以实现无眼操作,并为下一代雷达和无线系统提供集成的传感/通信.
科学领域:
- 光子学 是一个光子学.
- 天线工程天线工程
- 信号处理 信号处理
背景情况:
- 超宽带 (UWB) 波束成形对于先进的雷达和通信系统至关重要.
- 传统的基于相位变换器的相位阵列天线 (PAA) 面临着由于光束视而导致瞬时带宽的限制.
- 光子实时延迟 (TTD) 波束造型器是有希望的,但复杂的,阻碍了实际使用.
研究的目的:
- 为UWBPAAs开发一种新的光子束成形方法.
- 为了克服现有的TTD光束造型器和基于相变器的PAA的局限性.
- 为了使线性频率调制 (LFM) 波形能够实现无光束成形和连续转向.
主要方法:
- 采用了一种频率方向的光子准TTD光束成形技术.
- 这种方法利用多频阵列和光子微波混合阵列来消除传统的延迟线.
- 建造和测试了16元线性和4x4平面PAA的原型.
主要成果:
- 拟议的方法实现了对LFM波形的无光束成形和连续光束转向.
- 通过16元线性和4x4平面PAA在Ku频段展示了6GHz即时带宽.
- 综合传感 (具有2.6 x 3.0厘米分辨率的ISAR成像) 和通信 (4.8Gbps无线传输) 功能被成功展示.
结论:
- 为UWB光子PAA建立了一个紧,坚固和可扩展的架构.
- 这项技术为未来的综合雷达和通信系统铺平了道路.
- 该方法在束形应用中提供了无限空间分辨率的潜力.
相关概念视频
Cut-off Frequency of BJT
Cut-off frequencies in Bipolar Junction Transistors (BJTs) mark the transition between the signal's pass band and stop band, influencing their performance in amplifying or attenuating frequencies. These frequencies are crucial for designing BJTs to meet specific operational requirements in electronic circuits.
Alpha Cut-Off Frequency: Pertinent to the common-base configuration, the alpha cut-off frequency defines the upper-frequency limit at which the current gain, alpha, remains stable. As...
Alpha Cut-Off Frequency: Pertinent to the common-base configuration, the alpha cut-off frequency defines the upper-frequency limit at which the current gain, alpha, remains stable. As...
Properties of Fourier Transform I
The application of Fourier Transform properties in radio broadcasting is multifaceted, enabling significant advancements in the way signals are transmitted and received. Key areas where these properties are utilized include simultaneous multi-channel transmission, audio clip speed adjustments, live broadcast delays for different time zones, audio frequency adjustments, and signal demodulation.
In radio broadcasting, multiple audio signals often need to be transmitted simultaneously. The Fourier...
In radio broadcasting, multiple audio signals often need to be transmitted simultaneously. The Fourier...
Properties of Fourier Transform II
The Fourier Transform (FT) is an essential mathematical tool in signal processing, transforming a time-domain signal into its frequency-domain representation. This transformation elucidates the relationship between time and frequency domains through several properties, each revealing unique aspects of signal behavior.
The Frequency Shifting property of Fourier Transforms highlights that a shift in the frequency domain corresponds to a phase shift in the time domain. Mathematically, if x(t) has...
The Frequency Shifting property of Fourier Transforms highlights that a shift in the frequency domain corresponds to a phase shift in the time domain. Mathematically, if x(t) has...
Time and frequency -Domain Interpretation of Phase-lead Control
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
Time and frequency -Domain Interpretation of Phase-lag Control
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...
Electronic Distance Measuring Instruments
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

