摘要
高速矩形脉冲信号特有的纳秒级脉冲上升时间及极宽的频谱对射频同轴电缆的快速脉冲响应性能提出了极高的要求。通过对快速脉冲响应技术在高频低损耗射频同轴电缆中实现途径的研究发现,从减小对高速矩形脉冲信号幅值、脉冲上升时间、频谱带宽的影响出发,导体选择整体金属管结构和低电阻率材料,绝缘选择低介电常数和介质损耗材料,可降低电缆传输损耗频率特性影响;导体和绝缘材料选择各向同性的线性材料,可降低电缆传输相移特性影响。由此制作了试样电缆,经试验验证该电缆相比常规高频低损耗电缆缩短了高速矩形脉冲信号上升时间延迟近55%(仅为14 ns),实现了快速脉冲响应。因受电缆现有结构和材料所限,在确保高速矩形脉冲经电缆传输后所包含的高/低频分量比例不变的同时未能减少脉冲信号幅值的降低,对此可在电缆输出端增设脉冲放大器进行补偿。
The unique nanosecond pulse rise time and extremely wide frequency spectrum of high-speed rectangular pulse signals pose extremely high requirements for the fast pulse response performance of radio frequency(RF)coaxial cables.Through the study of the implementation path of fast pulse response technology in highfrequency and low-loss RF coaxial cables,it is found that starting from reducing the impact on the amplitude,pulse rise time,and spectral bandwidth of high-speed rectangular pulse signals,selecting a solid metal tube structure and low resistivity materials for conductor,and selecting low dielectric constant and dielectric loss materials for insulation can reduce the influence of transmission frequency losses characteristics;selecting isotropic linear materials for conductor and insulation materials can reduce the influence of transmission phase shift characteristics.A sample cable is thus produced,and it is experimentally verified that the cable shortened the rise time delay of high-speed rectangular pulse signals by nearly 55%(only 14ns)compared to conventional high-frequency low-loss cables,achieving fast pulse response.Due to the limitations of the existing structure and materials of the cable,while ensuring that the proportion of high/low frequency components contained in the high-speed rectangular pulse transmitted through the cable remains unchanged,the amplitude reduction of the pulse signal cannot be reduced.To compensate for this,apulse amplifier can be added at the cable output end.
作者
王海玉
肖怀远
WANG Haiyu;XIAO Huaiyuan(The 23rd Research Institute,CETC,Shanghai 201900,China)
出处
《光纤与电缆及其应用技术》
2025年第5期5-7,12,共4页
Optical Fiber & Electric Cable and Their Applications
关键词
射频同轴电缆
高速矩形脉冲信号
传输损耗
传输相移
脉冲上升时间
脉冲幅值
radio frequency(RF)coaxial cable
high-speed rectangular pulse signal
transmission loss
transmission phase shift
pulse rise time
pulse amplitude
