共查询到18条相似文献,搜索用时 156 毫秒
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该文设计了一款C波段单馈寄生阵列的宽带圆极化天线。此天线采用紧邻的双层F4B介质基板,通过在方形驱动贴片上开槽及采用寄生阵列的设计实现了圆极化。对天线结构的设计步骤进行说明,研究了各结构对天线阻抗带宽和轴比带宽的影响,并研究了寄生贴片切角长度和驱动贴片上的缝隙宽度对天线轴比和带宽的影响。对天线的圆极化方向图进行了仿真。仿真结果表明,在5.5 GHz时实现了右旋圆极化,最大增益为8.1 dBi。加工并测试了宽带圆极化天线,测试结果与仿真结果基本相符,天线实测的阻抗带宽为1.3 GHz,轴比带宽为1.26 GHz。设计的叠层天线具有结构紧凑,装配简单和轴比带宽大的优点。 相似文献
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一种宽带圆极化天线阵的设计 总被引:1,自引:1,他引:0
为了有效拓展阻抗带宽和圆极化带宽,分析了一种宽带多层结构的圆极化微带贴片天线。通过调整贴片和倒角的大小,并通过在底层贴片上周期性开槽,在天线工作于3.0GHz时,可以获得16.14%(VSWR〈2.0)的阻抗带宽和10.47%的3dB轴比带宽。在此基础上,制作了一个4×4元小型平面圆极化天线阵,阻抗带宽可以达到26.67%(VSWR〈2.0),轴比带宽可以达到11.12%(AR〈3dB)。这种结构的天线阵在无线通信等领域应用前景广阔。 相似文献
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该文设计了一种新颖的宽带圆极化单极子天线,该天线采用微带馈电模式。天线由C型贴片和改进的地板组成,整个天线尺寸仅为25×25×1 mm3。通过在C型贴片上切角和在地板上增加三角形微扰结构,可以有效增加天线的阻抗带宽和轴比带宽。该文给出了天线的设计流程,从表面电流分布分析了圆极化天线的工作机理。加工了天线实物,并对其进行了测量。仿真和实测结果表明天线具有超宽的阻抗带宽和轴比带宽。天线的工作频带为4.35~12 GHz(相对带宽为93.6%),3 dB轴比带宽为4.15~11.8 GHz(相对带宽为95.9%)。测量了天线的辐射性能和增益特性,实测结果与仿真结果吻合较好,证明了该天线的有效性。该天线可以应用于超宽带无线通信系统和卫星通信系统中。 相似文献
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杨文君楼建东雷雪陈国虎 《现代雷达》2013,(11):58-61
设计了一种新型的宽带圆极化微带天线,天线由两个完全相同的矩形微带贴片组成,采用微带线馈电方式为天线的上层微带贴片进行不对称馈电,下层贴片作为天线的部分地。天线从整体上是一个互补结构,根据圆极化产生的原理,在与馈电微带线相垂直的地方,开一条缝隙,产生正交的表面电流,调节天线的主要参数,使产生等幅正交的空间电场分量,从而产生圆极化波。通过增加十字形调谐结构,调节天线高频段的阻抗带宽和轴比带宽。天线在中心频率2.55 GHz处阻抗带宽(S11<-10 dB)为151%(0.8 GHz^4.5 GHz),天线的轴比带宽(AR<3 dB)为82.3%(1.5 GHz^3.6 GHz)。 相似文献
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Evans H. Gale P. Aljibouri B. Lim E.G. Korolkwiwicz E. Sambell A. 《Electronics letters》2000,36(24):1987-1988
A 5.8 GHz circularly polarised 2×2 patch antenna array is presented, employing sequential rotation of dual-feed circularly polarised elements; appropriate phase-shifting and power splitting are achieved via a serial feed arrangement. The feed has been optimised using simulated annealing; the resulting structure has a voltage standing wave ratio 2:1 bandwidth of 9.8%. Results obtained by full wave simulation and practical measurement confirm the integrity of the design 相似文献
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This paper presents the design, simulation, and measurements of two low-cost broadband circularly polarized (CP) printed antennas: an element and an array at 2 GHz. To realize the broadband circularly polarized antenna element, a circular microstrip patch is electromagnetically coupled by crossed slots cut in the ground plane, which is fed by an L-shaped microstrip feed. Two orthogonal modes in the patch are excited by using the crossed slots, and a single L-shaped feed provides a 90deg phase shift between two orthogonal slots. The antenna element achieves a 9.6% bandwidth for an axial ratio (AR) below 3 dB and a voltage standing wave ratio (VSWR) below 1.5. To further improve the performance, a sequentially rotated feed network is designed for a 2 times 2 array. The axial ratio value of the array is below 3 dB within a 27.2% bandwidth, from 1.75 GHz to 2.3 GHz. The return loss is above 10 dB within a 41% bandwidth, from 1.62 GHz to 2.45 GHz. Details of the proposed antenna element and the array design are described, and both the simulation and the experimental results are presented and discussed. 相似文献
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Kin-Lu Wong Shyh-Yeong Ke 《Antennas and Propagation, IEEE Transactions on》1993,41(2):246-249
The circular polarization condition for a rectangular microstrip patch antenna on a thin cylindrical substrate is investigated. The theoretical study is based on the modal-expansion theory, which is valid for the thin-substrate case. Numerical results for the aspect ratio of the cylindrical-rectangular patch, the optimal feed point for minimum voltage standing wave ratio and the 3-dB bandwidth for circularly polarized radiation are analyzed. Effects of the curvature on the circular polarization condition are also discussed 相似文献