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FSS在天线RCS减缩方面起了重要作用。针对一种锥形的带通FSS天线罩,设计了RCS测量载体,为了凸显FSS天线罩的透波特性和低于通带处的带外隐身性能,用双面角反射器模拟天线舱内天线系统产生的强散射,对FSS天线罩的传输特性和RCS性能进行了测量。结果表明,FSS天线罩在通带内有较好的透波特性,通带内的频点f0处RCS与测量载体的RCS曲线有相似形状,呈现出介质罩的透波特性。FSS天线罩在低于通带频点f1处透波特性衰减至约-15d B,通过统计鼻锥前向-60°~+60°范围内的RCS均值,FSS天线罩的RCS与载体相比较,RCS减缩均值达到-20d B左右,具有明显的减缩效果。 相似文献
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复杂载体短波天线特性的FDTD模拟与分析 总被引:6,自引:1,他引:5
分析复杂载体(卫星、舰船)上短波波段单极天线和矩形环天线特性.由于天线工作在短波波段(3~30MHz),通常载体尺寸与波长可比拟,因此天线与载体之间的电磁作用比较复杂,天线特性会受到很大影响.用时域有限差分(FDTD)方法模拟单极天线和环天线的算法,然后对一种简化卫星和舰船模型上单极天线和环天线特性是如何受天线位置、天线半径以及载体结构的影响进行模拟与分析.计算结果对实际工程应用有重要参考价值. 相似文献
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文章借助于有限元法对有源球形偶极子辐射天线在不同馈电方式下的方向特性进行了较为详细的仿真计算,并与实测结果进行比较,得到了基本一致的结论,对相关天线的设计具有良好的指导意义. 相似文献
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本文对常见机载短波天线进行了归纳分析,并提出了一种机载短波天线的实现方法,分析了其工作原理,给出了设计参数和实测结果。采用基于有限元法的仿真软件AnsoftHFSS对天线进行建模、仿真优化,最后确定了天线的尺寸。并给出了天线的远场辐射方向图,结果表明天线具有良好的电性能特性。 相似文献
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利用有限元法,对多轴系舰载雷达天线稳定转台系统动态特性进行了分析。天线稳定转台系统为复杂的多自由度弹性系统,利用子结构法对天线稳定转台系统各部件进行模态分析,通过边界条件耦合形成系统分析结果。计算了舰载雷达天线稳定转台系统在受到伺服驱动系统的激励下天线面阵的响应。 相似文献
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一种圆柱共形的全向微带天线 总被引:1,自引:0,他引:1
提出了一种全向的圆柱共形矩形微带天线。阐述了这种在薄圆柱形介质基片上的矩形微带天线的分析方法和设计方法,并给出了理论和实验结果,证实了这种天线在垂直于柱体轴的平面内辐射出全向性的方向图。 相似文献
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为满足机载系统的需要,给出了共形相控阵天线的分析和设计过程,同时研制了一种高度仅为0.14波长的准八木天线单元。利用三维电磁仿真软件HFSS对天线单元和共形相控阵进行了仿真设计,并研制了一套L频段共形相控阵天线。该天线由天线阵面、波束形成网络和波控器等构成。天线阵面由4个天线单元组成,共形安装在机头上。经实际测试,共形相控阵天线阵面的和波束在扫描范围内增益大于10 dBi,并具有较低的副瓣电平;差波束零深小于-20 dB。 相似文献
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针对海用雷达大孔径稀布接收阵列的特点,推导出了共形阵列和直线阵列方向图之间的关系,并基于直线阵列的最佳稀布算法,提出了一种共形阵列的波束综合方法,最后给出了仿真结果。 相似文献
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B. T. P. Madhav M. Venkateswara Rao T. Anilkumar 《Wireless Personal Communications》2018,103(3):1965-1976
This article presents the design and analysis of conformal circular monopole antenna with split ring resonator to get frequency notch characteristics in the wideband. Split ring resonators placed on one side of the substrate and complementary split ring resonators placed on the other side of the substrate at defected ground structure, which yields the frequency notch characteristics with respect to the microstrip feeding. Dual notch band characteristics are obtained between 4–4.3 and 7.3–8.1 GHz. The analyzed conformal characteristic of the antenna supports excellent constant reflection coefficient characteristics over the band at different angles. The impedance and radiation characteristics of the antenna model is analysed in simulation along with unit cell analysis of the SRR and the measured results are providing good agreement with them. 相似文献
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Investigations on sidelobe reduction in multibeam conformal antenna arrays are presented. The recently presented concept of sidelobe reduction in planar multibeam antenna arrays in conjunction with the phase compensation technique has been applied for the design of reduced sidelobe multibeam conformal antenna arrays. Six- and eight-element antenna arrays fed by modified Butler matrices have been investigated and minimum radii have been found for which the sidelobe level is comparable to the respective planar multibeam arrays. A novel fully integrated six-element four-beam antenna array has been successfully designed in which sidelobes equal -14 dB for all four beams have been achieved. 相似文献
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共形超颖表面可以打破物体几何形状与光学功能之间的限制,使散射波前得到任意的调制。文中展示了一种自适应的共形超颖表面,该超颖表面由非手性镜面对称的型金纳米天线组成,可以集成在任意形状的基底上,在可见光范围内(=450 nm)实现曲面全息。共形超颖表面的相位调制方法依赖于贝里相位,通过旋转纳米天线的方位角,可以在每个亚波长单元中进行连续的相位控制。这种共形超颖表面包裹在曲面拓扑物体上可以用于各种实际应用中,如曲面透镜聚焦、隐身和安全打印技术。 相似文献
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Tirunagari Anilkumar Boddapati T. P. Madhav Manikonda Venkateswara Rao Badugu Prudhvi Nadh Prathipati Rakesh Kumar 《International Journal of Communication Systems》2023,36(1):e5364
This work presents a compact and conformal frequency reconfigurable antenna for automotive applications. The antenna is designed on a liquid crystal polymer substrate of footprint 40 × 30 × 0.1 mm3. The proposed antenna is having coplanar waveguide feeding with a circular ring radiating element and a pair of parasitic circular elements to obtain the multiband operation. The proposed antenna is studied for frequency reconfigurable characteristics by placing the PIN diodes as switching elements in the desired locations and obtained the reconfigurability in the 4.5–6.5 GHz region. Further, the bending effects of the antenna with respect to its operating bands and the conformal effects with PIN diodes for the reconfigurable performance make this study a trailblazing work. The simulated and measured results describe that the on-glass conformal antenna is covering 1.58–2.33 (GPS, PCS, GSM1800/1900), 3.22–3.7 (WiMAX), and 4.25–6.8 GHz (WLAN, DSRC, WAVE, V2X) bands for vehicular communications with various switching cases. The obtained gain varies from 3.2 to 4.1 dB in the boresight direction and 6.9 to 9.8 dB in the lateral directions of the vehicle with placement on the vehicle body. As per the obtained results, the antenna is suitable to use for conformal usage on the windshield glass of the vehicle for connected driving scenarios. 相似文献
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文章介绍了一种可与圆柱体表面共形的具有全空间覆盖能力的相控阵天线,天线采用腔体缝隙单元,一维宽波束,另一维相控波束扫描,可实现圆柱体平台与卫星无缝链接,在有共形要求的中继卫星终端天线中有良好的应用前景。 相似文献
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A new dual-frequency dual-polarized array antenna for airborne applications is presented in this paper. Two planar arrays with thin substrates (R/T Duroid 5880 substrate, with εr = 2.2 and a thickness of 0.13 mm) are integrated to provide simultaneous operation at S band (3 GHz) and X band (10 GHz). Each 3 GHz antenna element is a large rectangular ring-resonator antenna, and has a 9.5 dBi gain that is about 3 dB higher than the gain of an ordinary ring antenna. The 10 GHz antenna elements are circular patches. They are combined to form the array with a gain of 18.3 dBi, using a series-fed structure to save the space of the feeding line network. The ultra-thin array can be easily placed on an aircraft's fuselage, due to its lightweight and conformal structure. It will be useful for wireless communication, radar, remote sensing, and surveillance applications. 相似文献