共查询到19条相似文献,搜索用时 93 毫秒
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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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超宽带雷达信号处理技术和实验研究 总被引:1,自引:0,他引:1
针对探测空中目标的超宽带(UWB)/冲激雷达,本文讨论了UWB/冲激雷达的信号处理技术,主要是信号检测和目标特性分析,首先讨论了目标检测技术,提出了用小波变换和高阶谱估计技术在变换域内进行检测的算法;其次讨论了目标特性分析技术,采用了高阶谱估计,提出了一种时域双谱估计算法,它可精确估计复杂形体目标的局部散射中心的分布。最后,结合作者等人研制的冲激雷达实验系统,对上述信号处理方法进行了实验研究,验证 相似文献
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超宽带天线是宽带电子系统中的关键部件。本文开展了折叠缝隙对数周期天线的电磁仿真和性能实验研究。根据对数周期偶极子天线的基本原理,设计了共面波导馈电的折叠缝隙对数周期天线。采用在折叠缝隙对数周期天线的折叠缝隙单元中加载相位槽的方法,进一步改善了天线低频端的驻波特性。对相位槽加载的折叠缝隙对数周期天线进行加工测试,测试结果表明在2 GHz~18 GHz的阻抗带宽内,驻波比小于3.5,与仿真结果吻合良好。设计了基于相位槽加载的共形LPFSA,给出了具体的仿真结果。本文的研究工作为该天线的实际应用提供了技术参考。 相似文献
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宽频带宽角域隐身是下一代隐身飞行器平台的关键特征之一,发展超宽带低剖面高隐身传感器已成为下一代隐身飞行器平台的必然趋势。文章瞄准天线阵列超宽带、轻薄化、高隐身的需求特点,设计了一款低剖面的宽带宽角相控阵隐身阵列天线。采用强互耦超宽带相控阵列技术,使阵列天线具备超宽带轻薄化低剖面特征,并通过宽带宽角阻抗匹配、阵列误差控制等手段缩减阵列天线雷达散射截面。仿真及测试结果表明,该低剖面天线阵列具有优良的宽带宽角辐射特性和低散射特性,基本满足下一代隐身飞行器平台对轻薄化低RCS阵列天线的需求,具有一定的工程应用价值。 相似文献
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针对地面对长槽阵列天线阻抗带宽的影响问题,设计出一种在激励偶极子上实施加载的超宽带长槽天线,其阻抗匹配带宽显著增加,最终得到了超过3. 5:1 的阻抗匹配带宽;在扫描范围内具有稳定辐射特性。该天线具有超带宽、剖面低、易共形等特点,在超宽带小型化相控阵天线中有良好应用前景。 相似文献
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随着对超宽带平面天线的研究和广泛应用,在超宽带天线中实现对其他无线通信设备特别是WLAN设备的干扰抑制成为近年来的研究热点。介绍了陷波特性超宽带天线的技术背景,对近几年国内外关于陷波超宽带天线的最新研究成果进行了分析总结,研究成果对超宽带天线的设计和频带的抑制具有一定的指导作用。最后对无线通信中超宽带天线的发展趋势进行了展望。 相似文献
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超宽带天线和可重构天线是当今天线领域研究的热点。将可重构天线技术应用到超宽带天线设计中,讨论了频率可重构超宽带天线的设计思路。以印刷单极子椭圆天线为原型,给出了两个可重构天线的具体结构,并对天线进行了可重构带阻设计,避免与相关频段之间的干扰。仿真结果表明:重构后天线Ⅱ的低频获得了扩展,其相对尺寸的长和宽分别减小到最大工作波长的0.116倍和0.087倍,工作频段为0.174~10.9GHz,可重构阻带为5.1~5.95GHz,带宽比可高达62:1. 相似文献
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Abdo AbdelMonem Shaalan M. I. Ramadan 《Journal of Infrared, Millimeter and Terahertz Waves》2010,31(8):958-968
This paper presents two design compact hexagonal monopole antennas for ultra-wideband applications. The two antennas are fed
by a single microstrip line . The Zeland IE3D version 12 is employed for analysis at the frequency band of 4 to 14 GHz which
has approved as a commercial UWB band. The experimental and simulation results exhibit good agreement together for antenna
1. The proposed antenna1 is able to achieve an impedance bandwidth about 111%. The proposed antenna2 is able to achieve an
impedance bandwidth about (31.58%) for lower frequency and (62.54%) for upper frequency bandwidth. A simulated frequency notched
band ranging from 6.05 GHz to 7.33 GHz and a measured frequency notched band ranging from 6.22 GHz to 8.99 GHz are achieved
and gives one narrow band of axial ratio (1.43%). The proposed antennas can be used in wireless ultra-wideband (UWB) communications. 相似文献
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Soheil Radiom Majid Baghaei-Nejad Hadi Aliakbarian Li-Rong Zheng Guy A. E. Vandenbosch George Gielen 《Wireless Personal Communications》2013,71(4):2913-2935
In this paper, a co-design methodology and the effect of antenna miniaturization in an impulse UWB system/transceiver is presented. Modified small-size printed tapered monopole antennas (PTMA) are designed in different scaling sizes. In order to evaluate the performance and functionality of these antennas, the effect of each antenna is studied in a given impulse UWB system. The UWB system includes an impulse UWB transmitter and two kinds of UWB receivers are considered, one based on correlation detection and one on energy detection schemes. A tunable low-power Impulse UWB transmitter is designed and the benefit of co-designing it with the PTMA antenna is investigated for the 3.1–10.6 GHz band. A comparison is given between a 50 $\Omega $ design and a co-designed version. Our antenna/transceiver co-design methodology shows improvement in both transmitter efficiency and whole system performance. The simulation results show that the PTMA antenna and its miniaturized geometries are suitable for UWB applications. 相似文献
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《Antennas and Propagation, IEEE Transactions on》2008,56(9):2894-2902
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Naichang Yuan Jianguo He Junjie Mao 《Journal of Infrared, Millimeter and Terahertz Waves》1998,19(2):343-347
A new type of ultra-wide band(UWB) conical antennas ridged by a novel taper finline radiator(TFR) used as radiation and receiving of the short pulse are developed. In which, a new UWB feed structure of a coplanar waveguide to finline and a TFR ridge are used initially. The experiment results show the characteristics of high fidelity, high efficiency, and high gain compared with some common broad-band antennas such as the biconical antennas, V-conical antennas, logarithm periodic antennas, and the other TEM horns. 相似文献
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In this paper, a novel fork shaped structure backed plane is added to a simple UWB (ultra wideband) slot antenna to enhance the impedance bandwidth as well as create triple band notched characteristics for Impulse Radio (IR) UWB applications. This fork-shaped structure is connected to a rectangular radiating patch at four different points through the cylindrical pins. The proposed antenna with this fork-shaped structure shows a very wide impedance bandwidth which spans from 2.5 up to more than 20 GHz and offers triple band-notched properties in WiMAX, WLAN and X-band downlink satellite communication spectrums. Moreover, the proposed antenna shows good radiation features such as gain, radiation efficiency and radiation patterns. A comprehensive investigation on the antenna time domain performance is also performed throughout the paper, and the effect of the proposed antenna on the two popular excitation pulses including modulated Gaussian (MG) and square root raised cosine (SRRC) pulses is fully investigated. A frequency-domain measurement setup is applied to measure time domain characteristics of the proposed antenna. Also, the realistic indoor multipath propagation channel characteristics when the proposed antennas are applied as the transmitter and receiver antennas are studied. Sub-band divided ray tracing method is used to simulate channel characteristics. 相似文献