一种新型时域反射系数近似方法

提出一种新型时域反射系数渐进公式,该公式形式简单且不受截断误差影响,解析式完备且结果精确,可有效地提高时域射线跟踪法的预测精度。用新方法对室内超宽带信号的平均功率延迟分布进行了预测,仿真结果和公开发表的文献结果相比,一致性良好。研究工作证明:新型时域射线跟踪法是预测超宽带信号传播特性的一种有效方法。     

Chirping techniques for enhancing the performance of SOA-based UWB over fiber systems: An experimental demonstration

A phaser-based processing technique was adopted in an UWB over fiber system employing SOA. The target is to simultaneously reduce the ASE noise impact and nonlinear effects inherent to optical amplification. Experimental results prove the effectiveness of chirping in terms of cross correlation and bit error rate.     

Wireless inter-chip interconnects

Inter-chip wireless interconnect technologies such as inductive coupling and electromagnetic wave propagation have been developed for future high performance system in package at low cost. Inductive coupling is used for near field transmission whose distance is shorter than 100 μm as local wireless interconnects. Antennas are used for far field transmission between chips whose distance is longer than 1 cm as global wireless interconnects. A single-chip Gaussian monocycle pulse (GMP) transmitter using complementary metal oxide semiconductor (CMOS) technology with an on-chip integrated antenna was developed for inter-chip ultra wideband (UWB) communication.     

Truly balanced pulse generator using microwave transistor and SRD

A novel efficient circuit for Ultra-WideBand (UWB) balanced sub-nanosecond monocycle pulse generation is presented. The pulse generator employs wideband bipolar transistor, step recovery diodes, Schottky diodes, and simple charging and discharging circuitry. Simple transient analysis and design of the circuit are presented along with their operating principle. The pulse generator produces truly balanced monocycle pulse with 500 ps pulse-width and 800 mV peak voltage. The generated monocycle pulse also has very symmetrical positive and negative portions and low ringing level. The presented pulse generator can be used as both a transmitter feeding UWB balanced antennas without broadband baluns and a balanced switching pulse generator that used in UWB receiver.     

微带环形平面双频超宽带天线设计

提出了一种微带双频UWB天线的设计,结合ADS,HFSS仿真工具;对天线结构进行理论优化并通过大量仿真对天线尺寸进行调整;优化出适合UWB FCC提出的3.1-10.6GHz频带范围的双频微带天线,此天线的优点不需要任何加载,结构简单;仿真结果表明天线性能良好,满足一定的带宽需求。     

宽阻带超宽带带通滤波器的设计

针对某些传统滤波器阻带较窄,抑制谐波性能差的缺点,对传统的阶梯阻抗谐振器( SIR)进行了改进,使之通带内回波损耗降低,频带增宽,同时利用缺陷接地结构(DGS)制谐波特性来增加阻带宽度,得到一款低插损滤波器,最后使用HFSS建模仿真.结果表明:该滤波器具有良好的通带效果,通带内插入损耗小于l dB,回波损耗大于10 d...     

便携设备中带陷蝶形UWB天线的设计

提出了一种应用于便携设备中具有带陷特性的平面蝶形UWB天线.该天线采用蝶形贴片作为辐射单元,并由渐变线作为阻抗变换器与50 Ω馈线进行匹配.通过在辐射面上挖C形槽实现带陷功能,并给出仿真和实测结果.该天线的工作频带覆盖3.1～10.6 GHz,并有效避免了5.15～5.825 GHz的无线局域网(WLAN)频段,适于便...     

Chirp—UWB信号产生系统性能分析

通过比较由直接数字频率合成器与锁相环组成的不同形式的Chirp—UWB信号产生系统的特点,包括环外混频、环内插入混频、激励三种,最终确定了DSS激励PLL的方式,并详细介绍了这种方式的工作原理,重点介绍了整个系统的相位噪声和杂散。同时在MATLAB/Simulink环境中建立整个系统的动态仿真模型来进行仿真,分析系统的合理性、正确性以及其中的相位噪声和杂散等重要性能指标,为提高整个系统的性能做好理论研究。     

一种新型的多边形超宽带印刷天线

在矩形贴片天线的基础上进行改进设计出一种新型的超宽带印刷天线,该天线由八边形的贴片和一个具有凹形槽的金属接地板组成,使天线得到了良好的超宽带阻抗匹配特性。通过数值仿真和实验测量,该结构的印刷天线在3 GHz-11 GHz频段内驻波比小于2,覆盖了超宽带天线所要求的工作频段,在H面具有良好的全向性辐射,为室内短程超宽带通信系统提供了良好的前端部件。     

Random projection method for ultra wideband signal acquisition

High-speed high-resolution analog-to-digital(A/D) conversion demanded by ultra wideband(UWB) signal processing is a very challenging problem.This paper proposes a parallel random projection method for UWB signal acquisition.The proposed method can achieve high sampling rate,high resolution and technical feasibility of hardware implementation.In the proposed method,an analog UWB signal is projected over a set of random sign functions.Then the low-rate high-resolution analog-to-digital convertors(ADCs) are us...