共查询到19条相似文献,搜索用时 296 毫秒
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提出了一种单层的具有多谐振结构的微带反射阵单元,利用高频电磁仿真软件Ansoft HFSS对其反射相位特性进行仿真分析,获得了约430°的反射相位动态范围,并且反射相位曲线的线性度较好.根据此单元设计了一个工作在Ku波段的微带反射阵,用指数渐变槽线(Vivaldi)天线作为该反射阵的馈源.仿真结果表明:在中心频率处增益可达27.1 dB,半功率波瓣宽度均为4.96°,在12~15.5 GHz的频带内增益波动约2 dB,具有较宽的频带.将此Vivaldi天线和反射阵天线进行加工测试,得到的测试结果与仿真结果吻合较好. 相似文献
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针对微带反射阵天线带宽窄的问题,提出了一种新型线极化双谐振宽带"蝴蝶"形单元结构,详细描述了单元结构设计步骤,研究了不同基板以及不同结构参数对单元相位曲线的相移范围、平滑度以及谐振点位置的影响。仿真测试表明,该单元结构能够在5.5-7GHz带宽内具有良好的相位特性曲线。对36个"蝴蝶"形单元组件测试表明,其在20%带宽内辐射效率达到40%以上,最大辐射方向上交叉极化电平小于-30dB。此外,"蝴蝶"形单元结构类似于"十"字形单元结构,有利于进一步扩展实现多频带、多波束反射阵天线设计。 相似文献
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微带反射阵天线的分析与设计 总被引:1,自引:0,他引:1
介绍了微带反射阵天线的基本原理,分析了天线设计中阵元单元尺寸和间隔的计算、相位延迟线的选择、基片厚度的选取、误差分析、仿真验证等,根据分析结果提出了低副瓣微带反射阵天线的设计方法。实例测试结果表明,反射阵天线的总体性能接近抛物面天线的性能,易于折叠、携带方便。 相似文献
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A novel structure using a variable microstrip ring with a slot ring on part of the ground plane is proposed as an auxiliary unit cell in a reflectarray. A progressive phase range larger than 682° has been achieved by changing the sizes of the microstrip rings and adding slot rings on part of the ground plane. A K-band reflectarray has been fabricated and shows very good performance. 相似文献
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传统基于微带缝隙和逆开环谐振器(CSRRs)的复合左右手传输线的带宽较窄、通带内反射损耗较大,限制了其应用。因此,该文采用了Minkowski分形的微带缝隙代替传统微带缝隙,有效地展宽了带宽,并通过在微带缝隙两侧加载短截线的方式进一步增加了带宽并改善了高频端带外抑制特性。分析了结构的尺寸参数对其传输特性的影响,并根据S参数计算了色散曲线、提出了等效电路模型。最后,运用所提出的方法设计了一款超宽带带通滤波器。该滤波器仅采用一个复合左右手(CRLH)结构单元,获得了超带宽2.1~9GHz(相对带宽124.3%)和较小的带内反射损耗(小于0.8dB),同时滤波器在9.5~12GHz的阻带范围内传输抑制大于20dB。测量结果、仿真结果与等效电路结果基本吻合,验证了该设计方法的有效性。 相似文献
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Design of millimeter wave microstrip reflectarrays 总被引:4,自引:0,他引:4
Pozar D.M. Targonski S.D. Syrigos H.D. 《Antennas and Propagation, IEEE Transactions on》1997,45(2):287-296
This paper discusses the theoretical modeling and practical design of millimeter wave reflectarrays using microstrip patch elements of variable size. A full-wave treatment of plane wave reflection from a uniform infinite array of microstrip patches is described and used to generate the required patch-design data and to calculate the radiation patterns of the reflectarray. The critical parameters of millimeter wave reflectarray design, such as aperture efficiency, phase errors, losses, and bandwidth are also discussed. Several reflectarray feeding techniques are described, and measurements from four reflectarray design examples at 28 and 77 GHz are presented 相似文献
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An array of microstrip patches loaded with slots is used to realise a passive reflectarray antenna in Ku band. The progressive phase distribution on the reflector surface is achieved by controlling both the length of the patch and of the slot aperture. A 437-element array prototype has been measured showing good results over a 4% bandwidth. 相似文献
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传统的反射阵利用相控器件与微带线实现波束赋形。为了降低相控成本与系统复杂度,提出基于时域调制阵列波束赋形技术。时域调制反射阵列是一种基于简单可重构反射单元的反射阵,它利用控制可重构反射单元的开与关,达到控制阵列输出,实现旁瓣抑制、波束赋形等功能。通过理论推导及仿真,结果表明,时域调制反射阵可以在不采用传统阵列中的相控器件及馈电网络的前提下,采用最小方差无失真响应波束赋形方法与时间调制法,生成理想的方向图,实现波束赋形功能。此特性将有利于推广波束赋形技术在毫米波频段反射阵的应用。 相似文献
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分析由两个弯曲振子及一个普通振子构成的单层三谐振单元的相位特性。对三种基板结构下单元的相移特性进行了研究。结果表明,采用混合基板,增加泡沫的厚度,可以在较宽频带内获得平滑的相移特性,同时相位动态范围大于360°。与三层堆叠结构的相移特性进行了比较,仿真结果表明可以达到与其相近的效果。最后给出了一种改进型单元结构,能够在6-10GHz带宽内得到基本一致的相移特性曲线。利用该结构组成一个12×13单元的反射阵列,带宽内效率约为50%。 相似文献
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A novel method is proposed to shape or switch the radiating beam of a reflectarray antenna by slight displacement of its layers with respect to each other. A reflectarray, which is a quasi-periodic structure composed of microstrip patches loaded by slot elements, is used in this scheme. The required phase shift at each position on the reflectarray surface is obtained by varying the slot length on the ground plane. Several groups of slots are etched on the slot layer and each group corresponds to one and the same beam. Mechanical alignment of the slots that belong to a certain group with the patch leads to activation of the corresponding beam. This method was used to design a reflectarray antenna with three beams at /spl plusmn/30/spl deg/ and 0/spl deg/. Measurement results demonstrated the validity of the design procedure. 相似文献