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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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介绍了一种基于低温共烧陶瓷工艺的新型高度集成毫米波无源接收前端, 该前端由阵列天线、馈电网络和带通滤波器构成.上述无源器件以天线集成封装方式经过一体化设计, 并应用于毫米波无线系统.首先, 设计了2×2线极化空气腔阵列天线, 通过采用新颖的内埋空气腔体结构, 使天线最大增益提高了2.9 dB.其次, 将具有双层谐振结构的三阶小型化发卡型带通滤波器和天线馈电网络进行一体化设计.该滤波器测试结果显示:插入损耗为1.9 dB, 3 dB相对带宽为8.1%(中心频率为34 GHz).最后将上述天线和滤波网络进行一体化设计, 实现了三维无线接收前端.在集成结构中, 通过采用金属柱栅栏抑制了寄生模式.测试结果显示天线最大增益可达14.3dB, 通过集成滤波馈电网络, 其阻抗带宽为2.8 GHz.该新型一体化集成前端系统具有良好的射频性能, 可作为全集成无源前端应用于Ka波段无线系统中. 相似文献
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张勇 《电子信息对抗技术》2017,32(1)
提出了一种小型超宽带(UWB)平面天线阵列并进行了优化.首先设计了两个不同的UWB天线单元方案:印刷天线-Vivaldi天线、平板天线-平面螺旋天线,并通过对比选择螺旋天线单元作为组阵单元.对该天线阵列的回波损耗、3D辐射图、方向图进行了仿真计算和设计.结果该天线阵列在6 ~ 10GHz内具有较好的定向辐射特性,增益达到15dB.进一步优化单元空间分布结构,使天线在相应频段内具有更佳的方向性.通过调整各个馈源的相位差,在不失去增益的同时,可以控制波束的偏转. 相似文献
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讨论了共面波导(CPW)馈电蝶形开口振子缝隙天线。在缝隙振子天线两端加入蝶形开口结构,形成振子蝶形组合结构天线。使用有限元仿真软件(Ansoft HFSS)分析了设计的天线,结果表明组合结构天线具有振子天线与蝶形天线的优点:蝶形天线的宽带特性与振子天线的高增益特性,整个天线的性能得到提高。使用了两种馈电方式:感性耦合和容性耦合,感性耦合时组合天线的带宽特性较好,从振子天线5.9%提高到10.32%;容性耦合时增益特性较好,从振子天线的3.19dB提高至6.27dB。分析了衬底厚度对天线的影响,衬底厚度的增加使谐振频率降低,但对天线带宽的影响不大。 相似文献
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Performance Optimization of Microstrip Antenna with Different Slot Configurations and Various Dielectric Materials
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The probe-fed patch antennas were proposed by changing the parameters such as dielectric materials and dimensions of patch for detail investigation of changes in output characteristics. Four rectangular slots were introduced separately for optimizing the antenna design and characteristics. This study illustrated the changes of output characteristics of an antenna with respect to the number of introduced slots on the radiating patch in addition to the effect of various dielectric materials on antenna performances. The antenna performances were analyzed by plotting the observation of various dielectric materials. The changes of antenna characteristics were also observed by introducing four numbers of slots on each edge of the patch to improve radiation characteristics with a wider impedance bandwidth. 相似文献
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针对传统贴片天线检测频率有限(2~35 GHz)且由于增益低导致检测结果不明显的问题,文中提出了以聚苯乙烯作为介质基板构建微带天线的解决方案。在以介电材料玻璃超细纤维为介质基板的理论基础上,采用高分子材料Polysty作为介质基板构建微带天线模型。结合经典天线理论计算辐射贴片以及介质基板尺寸;基于HFSS搭建Polysty作为介质基板的模型并根据微带天线特性将理论设计的微带天线参数进行优化,最终得到在1 GHz时微带天线的最佳尺寸。仿真及实验结果表明,Polysty作为介质基板的微带天线中心频率可以达到1 GHz,增益高并且检测角度范围大。 相似文献
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设计了一种宽带圆极化介质谐振器天线,为一种鼠笼形的宽带一分四90毅相移功分微带馈电网络,采用缝隙耦合对介质谐振器顺序旋转耦合馈电。天线结构紧凑、加工简单,仿真和实测结果吻合良好,其阻抗带宽和低于3dB的轴比带宽重叠部分在1.09 GHz-1.83GHz、为50.7%。增益大于3dB 及轴比小于3dB 的波束宽度均达到90°。天线工作频率覆盖四大导航系统,包括中国的北斗系统、美国的GPS 系统、欧洲的伽利略(GALTLEO)系统和俄罗斯的格洛纳斯(GLONASS )系统的频段,天线可应用于全球卫星导航定位系统和无线宽带通信系统中。 相似文献
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Rahul Mondal P. Soni Reddy Sushanta Sarkar Debasree Chanda Sarkar Partha Pratim Sarkar 《International Journal of Communication Systems》2023,36(5):e5430
A monopole antenna having desirable transmission characteristics with high gain is proposed. The monopole antenna comprises 45° tilted square shaped patch and modified rectangular metallic ground plane on FR4 dielectric substrate. The proposed monopole antenna operates from 2.6 GHz to 9.7 GHz with maximum peak gain of 2.3 dBi. Now, a dual-layer aperture-type FSS is designed having a passband from 5.9 GHz to 9.2 GHz and incorporated with the proposed monopole antenna. Thus, the combination only covers the selective frequency band from 5.5 GHz to 8.7 GHz with a stable gain of around 5 dBi. Second, another FSS is designed, which has one stop-band from 4.1 GHz to 5.4 GHz and two passbands on the both sides of this stop-band. This combination does not work from 4.1 GHz to 5.5 GHz but covers dual band from 2.48 GHz to 3.3 GHz with a peak gain of 5 dBi and 5.5 GHz to 10 GHz with a peak gain of 5.5 dBi. Therefore, without modifying the antenna design, any tunable transmission band can be achieved by the proposed combination. The proposed antenna and FSS combination structure may be suitable for military wireless applications for its band selection characteristics. 相似文献
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A new design approach for dual‐band patch antenna serving Ku/K band satellite communications
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M. R. Ahsan M. T. Islam M. Habib Ullah R. W. Aldhaheri M. M. Sheikh 《International Journal of Satellite Communications and Networking》2016,34(6):759-769
A printed planar antenna with simple and intelligent geometrical structure has been proposed for Ku/K band satellite communication systems. The radiating patch of the antenna is formed by cutting rectangular slots and extending the radiating element to some extent. The final design of the antenna with optimized parameters is fabricated on ceramic–polytetrafluoroethylene substrate materials of dielectric constant εr = 10.2. The antenna is excited through a microstrip feed line and has reduced ground plane that covers only the non‐radiating portion of the antenna. The reduced complexity of the antenna is easy to fabricate and has overall dimension of 40 × 35 × 1.905 mm3. The results from experimental analysis show that the proposed antenna can guarantee a wide bandwidth of 12.0 to 16.4 GHz at lower band, and the upper band covers the frequency in the range of 17.53 to 19.5 GHz. The antenna has achieved appreciable gain in the range of 3.14 to 4.68 dBi for lower band and 2.03 to 3.65 dBi for upper band. The proposed antenna has offered almost symmetrical and directional radiation pattern that is essentially suitable for serving Ku/K band satellite applications. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献