共查询到19条相似文献,搜索用时 187 毫秒
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本文对Nakano简化的曲线天线积分方程核做了更便于数值计算的处理;运用矩量法分析,计算了谐振式四臂螺旋天线的圆极化方向图、增益、轴比、前后比及赋形特性等,并研究了馈电方法和导电板对天线性能的影响。 相似文献
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本文研究一种应用于卫星通信系统车载移动站的走向圆极化天线——双臂微带螺旋天线,文中应用二次曲线段三角基函数展开的矩量法对天线的各项电性能指标作了数值计算,为天线的设计和调整提供了充分的理论依据和切实可行的思路和方法。 相似文献
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Champagne N.J. II Williams J.T. Wilton D.R. 《Antennas and Propagation, IEEE Transactions on》1992,40(6):682-689
To reduce the number of segments required to model curved wire structures, a method of moments formulation using curved wire segments is presented. Piecewise quadratic wire segments are used to discretize the wire geometry. This algorithm is used to analyze a small wire loop antenna and multiple-arm Archimedian spiral antenna. For each example, a comparison is made between results obtained using this quadratic segment algorithm and a linear segment algorithm. These examples demonstrate that the memory required is significantly reduced and a reduction in the solution time is achieved when quadratic segments are used 相似文献
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Archimedian and logarithmic printed wire spirals are analyzed using a moment-method incorporating curved piecewise sinusoidal subdomain basis and testing functions. Results for spiral parameters including input impedance and current distribution are presented and are shown to have good agreement with published results for the same antennas obtained using linear segmentation. Since the curved basis functions exactly follow the spiral contour, significantly fewer curved segments are, therefore, required for accurate analysis compared with linear segmentation 相似文献
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无源雷达导引头一般采用宽带天线以满足对空间辐射源的探测和跟踪。圆锥等角螺旋天线具有宽频带和圆极化的辐射性能,因此它是一种合适的无源雷达导引头天线实现方案。为了满足实际项目的需要,本文开展了圆锥等角螺旋天线的设计和实验研究。设计了具体的天线结构和参数,采用微带粘结技术实现圆锥表面共形的等角螺旋天线臂的加工和焊接。设计了一种超宽带微带平衡-不平衡转换器(巴伦)以实现对设计天线的馈电。在微波暗室内对加工的天线进行了测量,给出了辐射方向图、增益、轴比等测试结果。实验结果表明,对于频带1GHz到5GHz工作频率范围,本文设计和加工的天线性能可以满足技术要求,其实验结果为本天线的实际应用奠定了基础。 相似文献
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From an experimental investigation of the foil-type kind of a conical, logarithmic spiral antenna, the relative phase velocity along the antenna arm as a function of the cone angle has been found. It is probable that a reduction of the antenna length by one half can be achieved by using a special dielectric loading. 相似文献
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锥形螺旋电感是一种新型电感,在较宽的频带内有良好的一致性,在毫米波电路和光载无线通信系统(RoF Radio-over-Fiber)中有广泛的应用.本文对锥形螺旋电感感值、螺旋电感长度、直流电阻的计算方法进行了研究,给出了精确计算方法,其中,电感值误差在10.2%以内,直流电阻误差在6.5%以内;对锥形空心螺旋电感微波特性进行研究,提出了一种等效模型,该模型拟合计算结果与实测曲线有较好的一致性,使用该模型给出了螺旋电感宽带特性的详细理论推导,同时利用该模型首次对锥形螺旋电感的宽带特性进行了直观解释;最后,将绕制参数对电感微波性能的影响进行分析,引入单位长度电感量参数α和电感量-频率参数β,可对超宽带锥形电感微波特性进行优化,对某些特性进行快速优化. 相似文献
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WANG Qi HE Qing-qiang 《中国电子科技》2005,3(4):334-337
Using the wire construction technique, a conical monopole antenna is fabricated. With the method of moments, the dependences of the voltage standing wave ratio (VSWR) on the number of the trapezoid wire elements, conical angles, wire radius, etc. are investigated. The calculation and the experiment show that the designed wire conical antenna has the ultra-wideband property and can be used for the engineering. 相似文献