共查询到19条相似文献,搜索用时 125 毫秒
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首先提出了一种新结构共面波导馈电的小型平面超宽带(UWB)天线,该天线类似一般的共面波导馈电宽缝隙天线,为了获得超宽带工作特性,设计方案中采用了叉状结构的调谐支节,并将其辐射缝隙设计为多边形;通过数值计算研究了某些尺寸参数对天线输入特性的影响,在计算的基础上通过大量的实验详细研究了天线的频域工作特性,然后对其时域瞬时脉冲信号保真度特性进行了数值分析。计算与实验的结果表明,该天线具有超过3.2∶1的工作带宽和全向辐射特性,而且具有较好的线性相位传输特性和脉冲信号保真度,是一种有实用意义的超宽带天线。 相似文献
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设计了两种小型宽缝结构超宽带天线,一种采用接地CPW馈电方式,另一种采用带状线馈电方式。结果表明这两种天线都有较宽的阻抗带宽。分析了两种天线的特性参数,并比较两种天线的增益和辐射特性,给出两种天线在远区场的脉冲波形比较,并得出不同天线结构对脉冲波形的保真度的影响,这对实际超宽带脉冲天线的设计与应用意义重大。 相似文献
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基于脉冲形成网络的超宽带脉冲产生与设计 总被引:2,自引:0,他引:2
分析了超宽带天线对冲击脉冲波形的要求.利用阶跃恢复二极管和微带传输线.通过延迟的方法设计并制作了超宽带双极脉冲发生器.根据超宽带脉冲发生器产生的脉冲参数,通过理论分析和时域有限差分法(FDTD)仿真,给出了一种微带脉冲形成网络的设计方法,并利用该方法成功地产生了纳秒级宽度的双极性超宽带窄脉冲信号.测量结果表明:经过脉冲形成网络产生的信号具有良好的波形,且拖尾振荡小,有利于提高天线的辐射效率. 相似文献
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用于超短脉冲辐射和接收的新型平面集成天线辐射元 总被引:1,自引:0,他引:1
研制出一种用于超宽带短脉冲辐射和接收的新型平面集成超宽带(UWB)天线辐射元,该天线辐射元采用共面波导到槽线的宽带过滤方式馈电,超短脉冲辐射和接收的实验结果显示了其高保真宽带及高增益、高效率的特性。 相似文献
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Presented are the transient characteristics of a tapered loop antenna fed by the composite right/left-handed coplanar waveguide-to-coplanar stripline balun. The antenna operates within 2.5-7.5 GHz and thus is suitable for ultra-wideband applications. The performance of the system comprising two identical tapered loop antennas is characterised by pulse radiation and reception. The fidelity of pulse response is presented to evaluate the signal distortion in the time domain 相似文献
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分析了超宽带无线系统中,天线在发射和接收过程中对基带脉冲信号波形的失真影响.采用了天线系统传递函数描述天线的辐射和接收特性,在暗室中对典型的超宽带印刷天线进行频域特性和时域特性的测量,给出了脉冲信号的辐射和接收过程.研究表明结合天线系统传递函数,可以设计出更符合FCC辐射功率掩蔽的脉冲信号,以及选取出波形保真系数最佳的本地模板信号,从而获得全局性能最优的超宽带系统. 相似文献
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新型集成超宽带开槽天线的研制及其应用 总被引:9,自引:1,他引:9
研制出一种用于超宽带短脉宽射和接收的新型集成超宽带槽天线,该天线采用共面波导到槽线的宽带过渡方式馈电,实验结果显示了其高保真的宽带特性及高增益高效益特性。利用所研制的UWB天线建立起超宽超带雷达实验系统,测量几种简单目标特性及涂层目标特性,证明了该种天线可用作实际的UWBR天线。 相似文献
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Do-Hoon Kwon 《Antennas and Propagation, IEEE Transactions on》2006,54(8):2208-2215
Pulse-preserving capabilities of ultrawideband (UWB) antennas, which are measured in terms of two parameters-the fidelity factor and the pulse width stretch ratio, are analyzed with respect to variations of the antenna gain and the group delay of the radiated field. With the degrees of the gain and the group delay variations quantified by their respective standard deviations from constant values, Monte-Carlo simulations are performed to evaluate the effect of different gain and group delay functions using randomly generated Gaussian profiles. The means and the standard variations of the two performance parameter distributions are monitored and their two-dimensional profiles are specifically obtained for UWB antennas operating in 3.1-10.6 GHz. The analysis also demonstrates the use of the fidelity factor and the pulse width stretch ratio as useful characterizing parameters for UWB antennas. 相似文献
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Taeyoung Yang William A. Davis Warren L. Stutzman S. M. Shajedul Hasan Randall Nealy Carl B. Dietrich Jeff H. Reed 《Analog Integrated Circuits and Signal Processing》2011,69(2-3):161-171
Antennas are a key enabling technology for software-defined radio (SDR). Although software is extremely flexible, SDR??s potential is limited by antenna size and performance. In this paper, we review typical antenna miniaturization techniques and fundamental theories that limit antenna size and performance including operational bandwidth, gain (or range), and radiation pattern. Possible antenna design strategies are discussed to meet the desired specifications in SDR based on observations from the limit theories. The application of strategies to enable multiband (resonant), continuous multiband (frequency independent), and instantaneous, ultra-wideband antennas are discussed qualitatively. Advantages, disadvantages, and design trade-off strategies for different types of antennas are compared from a system-level perspective. A design example for a compact ultra-wideband (UWB) antenna is presented for a software-defined platform. The example involves a direct-conversion radio developed in Wireless@VT that uses a Motorola RFIC having a 100 MHz?C6 GHz operational frequency range with a 9 kHz?C20 MHz channel bandwidth. The example antenna covers frequencies from 450 MHz to 6 GHz instantaneously with approximately 5-dBi realized gain over a finite-size ground plane, including return loss and omni-directional coverage. 相似文献
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提出一种电磁脉冲辐射系统设计方案,此系统由Marx发生器、短路-锐化组合开关型脉冲形成线和带低频补偿的高功率超宽带横向电磁波(TEM)喇叭天线组成.Marx发生器产生的单极脉冲经过短路-锐化组合开关型脉冲形成线锐化成双极脉冲,然后馈入天线进行辐射.仿真结果表明,在充电电压为10 kV时,电磁脉冲源可产生脉冲宽度1.41... 相似文献
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用于瞬态电磁场测量的宽带脉冲天线 总被引:4,自引:3,他引:1
脉冲天线是脉冲雷达、瞬态电磁场测量等应用的关键设备之一。本文描述了用于瞬态电磁场测量的一种宽带脉冲天线的设计,给出了测量结果,测量结果表明,该天线具有高保真和宽频带特性,有有效地发射或接收毫微秒脉冲信号。实际制作的天线已成功地应用于外场瞬态电磁测试系统。 相似文献