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研究了一种具有良好工作性能的微带-喇叭组合右旋圆极化天线,首先设计了一种双层宽带圆极化微带天线结构,同时满足电压驻波比(VSWR)≤2,轴比(AR)≤4 dB的频带宽度(Bw)≥24%,主极化增益大于9 dBi;通过引入角锥喇叭结构,在工作频带内将天线增益提高到12 dBi以上,同时不影响原天线的其他性能。为更好了解微带-喇叭组合右旋圆极化天线的性能,并快速而准确地设计该天线结构,对天线主要几何参数进行了适当分析和研究。 相似文献
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Efficient PO-MOM Method for Analysis of the Radiation Characteristics of a Large Antenna-Radome System 总被引:1,自引:1,他引:0
An efficient hybrid method based on the method of moments(MOM)and physical optics(PO)for the analysis of radiation characteristics of an electrically large antenna-radome system is presented.Specifically,MOM is first applied to the antenna to find the current on its surface,and then the equivalent PO currents produced by the antenna radiation are assumed on the radome wall.When the coupling of the PO currents and antenna current is considered,the coupling matrix is divided into a series of partial matrices,in order to deduce the memory requirement and accelerate the evaluation process.Numerical results indicate that the proposed hybrid PO-MOM method is accurate and efficient. 相似文献
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采用非分裂式理想匹配层(UPML)吸收边界条件有效地减小了计算空间;使用金属细线算法考察了探针半径对微带天线特性的影响;对于输入阻抗及方向图计算中涉及到的晚时响应采用修正的广义函数束方法(GPOF)进行外推插值,大大节省了计算时间,并使用解析方法有效地减少了离散傅立叶变换的计算量;对于采用软激励时时域电压波形不收敛于零的问题提出了一种解决办法;比较了有限大及无限大介质衬底对天线特性的影响。计算结果与现有文献及实验数据相比较,证明了本文方法的正确性和有效性。 相似文献
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Recently ,rigorousfull wavesolutionsbasedonthemomentmethodhavebeen presentedtoanalyzethemutualcouplingeffectbetweenthecylindricallyconformalmicrostripantennas[1,2 ] .Buttherearestilltwoproblemstobesolved .①Itiswellknownthatthetermsofcircumfer entialserieswillincreaserapidlywhentheradiusofthecylinderbecomeslarge .So ,itisverydifficulttoobtaintheconvergentresultsofthespectralfunctionintegrandsevenbyusingthesuperworkstationsuchasVAX6 42 0duetothedirectcomputationofhighorderBesselfunctionswithl… 相似文献
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一种宽频带圆柱共形微带天线全波分析和设计 总被引:2,自引:1,他引:1
采用双层介质双贴片结构展宽天线的阻抗带宽,并利用小的贴片电容补偿由厚介质衬底引起的探针电感效应,进一步扩展了频带宽度.基于共形FDTD法结合圆柱分层媒质中并矢格林函数的新方法,对此类天线的近场和远场特性进行了严格的全波分析.提出了系统的设计流程,使得天线的设计过程变得简单易行.设计和仿真结果表明,在不增加剖面厚度的情况下,工作于L和C波段的天线带宽(VSWR≤2.0)可达近30%甚至更宽. 相似文献
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Based on the integral equation formulations and the moment method, a novel closed-form solution for analyzing the mutual coupling effect between the cylindrical comformal rectangular microstrip patch antennas is presented. By using this algorithm, the dements of the impedance matrix and exciting vector are cast into closed-forms, thus the computational efficiency is improved dramatically. Numerical results are presented to verify the validity and reliability of the algorithm. 相似文献