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以全球微波接入互操作系统(WiMax)增补频段上的四单元宽带贴片天线阵列为研究对象,通过分析计算和实验测量,详细研究了机械支撑结构对宽带微带贴片天线阵列的交叉极化性能影响。分析及测试结果表明,介质支撑结构的阵列天线具有更好的交叉极化特性。文章的结论对改善贴片阵列天线的极化纯度、优化天线单元的机械支撑结构具有实际意义。 相似文献
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深入讨论了交叉极化干扰的工程化问题,详细分析了自适应交叉极化信号产生的天线极化特性和幅相控制要求,阐述了该技术工程实现方面的边界条件,对该技术在实际装备的应用提供了指导意见。通过理论分析和相关计算表明:如果能将通道相位和幅度误差分别控制在*6°、*0.5d B,就能够满足交叉极化干扰的控制要求。 相似文献
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普通测向系统有其固有的缺点:(1)角分辨度低;(2)角估计误差较大,虽然,当阵列只接收一个信号时,自适应阵列测向系统不如普通测向系统优越,但如果要测量空间多个信号的方位角时,自适应阵列测向系统却具有角分辨度高和角估计误差小的突出优点,本文主要介绍自适应阵列测向系统的原理,性能和实验结果。 相似文献
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为使阵列天线同时具有高增益、低副瓣和高交叉极化比的特性,文章通过在馈源上放置龙勃透镜来提高天线增益,对馈电网络进行幅度加窗和180°反相馈电设计,大幅降低了天线的副瓣,提高了天线的交叉极化比。 相似文献
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本文讨论了在卫星地面站采用自适应阵列天线的优越性,对自适应阵列天线波束控制移相器有无误差情况下的波束形成器输出信号干扰噪声比(SINR)进行了详细推导,并对结果进行了模拟。 相似文献
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窄波束全向接收的自适应天线阵研究 总被引:4,自引:0,他引:4
为了实现对短波频段全空域低信噪比信号的良好接收,本文提出了一种窄波束全向接收的知适应天线阵。文中首先简要回顾了自适应天线阵的基本理论,并针地短波波段频程较宽的特点,提出了一种接收信号频率决定阵元间距的阵元间距动态可变组阵方案,文末通过计算机仿真比较了该方案实现的窄波束全向接收自适应天线阵和常规短波天线阵的性能。 相似文献
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Chen Xiaochu Leng Mei 《电子科学学刊(英文版)》1998,15(1):29-34
In this paper, a new recursive algorithm of adaptive array weight vectors and its systolic array implementing structure is proposed, which is based on the QR decomposition algorithms and the idea of algorithmic engineering. The algorithm can realize fully parallel and pipeline processing. 相似文献
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为了对随机相位误差对于相控阵天线波束指向精度和副瓣电平的影响进行分析,以一维均匀直线阵为模型,采用概率统计的手段对波束指向误差的数学期望、方差和峰值副瓣电平进行了推导,并对此结果进行了计算机仿真验证和比较.仿真结果表明,理论公式推导得到的结论与仿真实验的各项结果吻合良好. 相似文献
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In this paper, the radiation performance of an antenna array is improved by designing a new wideband artificial magnetic conductor (AMC). The proposed AMC surface operates at the frequency of 3 GHz with ±90° reflection phase bandwidth of 22%. In order to identify the key design parameters of the AMC structure, a parametric study is performed. To improve the radiation performance of the antenna array, an AMC reflector is developed through utilizing an array of 2 × 8 periodic patches of AMC unit cells. By this technique, the front to back ratio of the designed antenna array is enhanced about 16.27 dB. It is concluded that tuning of the AMC dimensions for controlling the reflection coefficient at each port of antenna array during beam steering is necessary. Because of the using of the AMC surfaces as a reflector instead of conventional PEC surfaces, size reduction of the antenna array in the order of 20% is achieved. In this study, a circuit model for single element of the antenna array with considering AMC loading effect is introduced, which predicts the bandwidth behaviour of the proposed antenna. The final designed antenna array exhibits low level of cross polarization making it well‐suited for tracking radars and electronic warfare applications. The proposed antenna with the AMC reflector is fabricated and measured. The measured ?10 dB impedance bandwidth and peak gain of the proposed antenna is 20% (2.7‐3.25 GHz) and 13.4 dBi, respectively, which are compatible with the simulation results. 相似文献
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简要介绍了自适应旁瓣对消的基本原理,推导出便于工程实现的理论公式。结合某型数字阵列雷达的研制,分析其特点。详细阐述旁瓣对消技术在数字阵列雷达中的应用方法,给出了理论仿真结果以及工程实现框图。 相似文献
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