新型小尺寸带引向器波纹开眼对拓型Vivaldi天线

基于传统对拓型Vivaldi天线, 提出一种新型小尺寸对拓型Vivaldi天线.采用波纹、开眼和引向器等结构来展宽天线的工作带宽, 并分别对这三种结构对带宽的影响进行了分析.利用HFSS仿真优化得到的结构参数, 分别在两种介质材料上, 加工并测试了带引向器波纹开眼对拓型Vivaldi天线, 实测与仿真结果吻合.仿真与测试结果表明:两种介质上的天线工作频带均包含3~20 GHz, 尺寸仅为42.56 mm×40.16 mm×0.813 mm, 带内回波损耗S₁₁低于-10 dB, 带内增益均大于3 dBi, 最大增益达7.3 dBi, 交叉极化均小于-15 dB, 50%以上的频带交叉极化小于-20 dB, 最小可达-25 dB, 天线具有稳定的方向图, 良好的波形保真度, 是一种宽波束天线.     

一种小型平面超宽带天线的设计与实现

提出了一种新颖的小型平面超宽带天线。该天线由矩形微带天线的基本结构演变而来,为获得超宽带频率特性,设计时辐射单元下端采用了渐变结构,金属底板使用缺陷地结构。对天线的反射系数、方向图及增益进行了仿真计算和优化设计,实测结果为:天线的工作频段为3.1~13.0 GHz(S11<-10 dB),增益大于1 dB,具有良好的超宽带特性和全向辐射特性。     

一种工作于0.5~2GHz的小型化Vivaldi天线

设计了一种用于浅层冰盖探测的小型化宽带Vivaldi天线,该天线使用微带转槽线的巴伦馈电,可工作于500MHz～2GHz的带宽之内.天线采用共面结构,能够有效降低交叉极化电平.为提高天线的增益并避免低频端方向图端射方向出现凹陷,使用了较厚的介质基片,并增加了天线的长度,但天线的尺寸仍只有345mm×263.7mm,仿真得到的天线增益在全频带内大于2.8dBi.测量得到的阻抗带宽(驻波比≤2)达到1.94GHz,与仿真结果较为吻合.测试得到的E面和H面归一化方向图在大于800MHz的频带内与仿真结果一致性较好.     

一种新型超宽带端射微带天线的自动设计

采用遗传算法和时城有限差分算法(FDTD),结合并行计算技术成功地构建了一套天线自动设计软件系统:"天基"天线自动设计系统.运用该天线自动设计软件系统,对一种采用泪滴状偶极振子和平面套筒结构的微带天线进行了超宽带和高端射增益的自动设计.根据设计结果制作了实际天线并进行了测试,测试结果表明该天线具有良好的超宽带性能,S11<-10 dB的频带超过了2.5倍频程(1.3～3.4 GHz),在此工作频带中,天线辐射为端射,最大端射增益达到了9.2 dBi.     

双频双极化端射天线

本文提出了一种结构紧凑的毫米波双频双极化端射天线。传统的双极化天线实现方式主要是：磁电偶极子、贴片天线和正交模式耦合器来实现,这些实现方式存在结构尺寸较大、不易集成,带宽和平面化难以兼顾的缺点。本文提出的双频双极化端射天线利用堆叠结构,实现了水平极化和垂直极化的极化分离,同时采用Vivaldi天线结构,实现了宽带特性。与传统正交放置的Vivaldi双极化天线相比较,本设计具有减少天线尺寸,易实现平面集成,结构简单等优点。仿真结果表明该天线垂直极化部分,在E波段60-90GHz频带范围内,S11均在-10dB以下,交叉极化在-20dB以下;水平极化部分,在Ka波段26-32GHz频带范围内,S11均在-10dB以下,交叉极化在-20dB以下。     

一种新型微带端射平面树形天线的自动设计

将一种新的优化算法—自然树生长竞争算法,用于天线优化,结合基于有限元方法（FEM）的电磁场数值仿真软件,实现天线的自动设计,并设计出的新型微带端射平面树形天线。在5.77GHz～5.93GHz频段内S11〈-10dB,辐射方向保持良好的端射特性,且在5.8GHz的端射增益为5.4dBi。根据仿真结果,制作一个原型天线并对其进行测试,测试结果与仿真结果吻合良好。     

一种高增益Vivaldi超宽带天线

传统的Vivaldi天线具有超宽带优点,但存在定向性较差,且在工作频带的两端增益下降严重的问题。文中提出了一种高增益的Vivaldi天线,通过对传统微带线馈电结构的Vivaldi超宽带天线加载零折射率超常介质和轴向边缘梳状结构的矩形槽缝结构,提高了天线在整个工作频段内的增益。对所提出的天线进行了设计、优化和仿真分析,并制作天线样品,仿真和测试结果吻合良好。测试与仿真结果表明,在4~11 GHz的工作频段内,天线的回波损耗优于-10 dB;与传统Vivaldi天线相比,在整个工作频段内天线增益均有所提高,其中在工作频率的低端(4~6 GHz)天线增益提高2.5 dB,高端(9~11 GHz)增益提高1.5 dB。     

一种新颖的Ku频段宽带微带天线阵的设计

文章设计了一种新颖的Ku频段宽带微带天线阵。该阵列的天线单元为分层结构,通过在馈线增加匹配枝节,上层贴片附加寄生单元,实现了宽频带性能。仿真表明,天线单元的相对阻抗带宽(S11<﹣10 dB)达到了17.2%,频带内增益大于8.4 dBi,四单元天线阵的增益大于15.1 dBi。     

应用于WLAN/WiMAX的双6型对称三频单极子天线

设计了一款适应于无线局域网络(WLAN)和全球微波互联接入(WiMAX)的由微带线馈电的平面印刷三频单极子天线。天线的正面呈对称双6形状,提供低频辐射和较宽带宽的高频辐射。为了满足三频设计激励起WiMAX所需的中间频段,在天线背面的接地板上开对称槽线。利用有限元法的电磁仿真软件Ansoft HFSS 15.0进行仿真设计,优化结构数据并得到天线的最终辐射特性结果。结果表明,天线在回波损耗小于-10 dB的工作频带分别是2.39~2.72 GHz,3.36~3.86 GHz和4.22~5.83 GHz,很好地实现了在WLAN和WiMAX的工作频带。同时天线尺寸小、结构简单、共面性好、容易实现,而且天线在各个工作频段具有良好的方向性和增益。     

电小尺寸锥台上双馈圆极化共形微带天线阵设计

在电小尺寸锥台上,设计并实现一款锥台共形水平全向双馈圆极化微带天线阵。该天线的工作频率覆盖GPS L1频点(1.575 GHz)和北斗导航系统B1频点(1.562 GHz)。基于HFSS软件仿真,分析了锥台共形对天线阵单元的S11、轴比和增益等参数带来的影响,通过调整辐射贴片尺寸,减小了锥台共形对天线的影响,改善了圆极化性能,提高了天线的圆极化增益。加工天线阵并进行测试,测试结果表明,该天线阵在1.55～1.60 GHz频段内,S11参数≤-10 dB,在GPS L1频点和北斗B1频点,水平全向增益最大值达到了1.73 dB,1.25 dB,增益不圆度≤2.5 dB,实测结果表明该天线具有良好的水平全向圆极化辐射性能。     

Millimeter-wave twin tapered-slot antenna

A millimeter-wave twin tapered-slot antenna on standard substrate is presented. The twin antenna is constructed by single tapered slot antennas (TSA), printed on opposite sides of a low dielectric constant (/spl epsiv//sub r/=2.2) substrate. The structure is fed by a rectangular waveguide followed by a broadband finline-to-slotline power splitter. The radiation pattern of the single TSAs is improved by corrugating the taper contour by a series of short-circuited stubs. With this method, antennas three times thicker compared with conventional TSA designs can be realized with an almost unchanged performance. Experimental radiation patterns of a 65-GHz twin TSA in comparison to both simulation results and corresponding single TSA measurements are presented. A measured twin antenna gain of 17.5 dB indicates efficient radiation.     

基于基片集成波导馈电的Ka波段渐变缝隙天线设计

在被动毫米波 (PMMW) 成像焦平面阵列 (FPA) 馈源的天线中,直线渐变缝隙天线 (LTSA) 相对于传统的喇叭天线、介质棒天线具有其独特的优势。该文优化设计了一种新型的对跖直线渐变缝隙天线 (ALTSA),通过加载超材料结构使天线的增益得到了改善,天线采用基片集成波导 (SIW) 技术进行馈电。通过仿真与测试分析,该天线在较宽的频带内具有良好的阻抗特性、较低的副瓣电平及较高且平稳的增益,所设计的天线具有较小的口径宽度,在焦平面中易于组成较为密集的馈源阵列,以提高被动毫米波成像的空间分辨率。     

Ultra-wideband tapered slot antenna with band cutoff characteristic

A novel ultra-wideband (UWB) tapered slot antenna (TSA) is proposed that has both enhanced impedance bandwidth enough to cover UWB systems and band cutoff characteristic of 5 GHz WLAN band limited by IEEE802.11a and HIPERLAN/2. To achieve these two characteristics of wide bandwidth and partial band cutoff at the TSA, a broadband microstrip-slotline transition with multi-arm stubs and /spl lambda//4 short stubs, respectively, is used. From measured results, it is observed that wide bandwidth of about 2 octaves from 2.8 to 11.09 GHz for the VSWR<2 is achieved, while 5.05-5.93 GHz is cutoff with the radiated power of this cutoff band effectively suppressed as about -9 dB for the peak power level of other bands.     

Low-cost small-size tapered slot antenna for lower band UWB applications

A low-cost small-size tapered slot antenna (TSA) is investigated in view of ultra-wideband (UWB) applications. First, the bandwidth of the antenna is studied for the lower UWB band: 3.1-4.85 GHz. Secondly, the design is made as small as possible. Thirdly, the pulse distortion of a modulated Gaussian pulse in the lower UWB band, between 3.5 and 4.5 GHz, is investigated based on the measured S/sub 21/-parameter. The low distortion observed indicates that this TSA is suitable for applications in the lower UWB band.     

一种Ⅹ-KU波段TSA天线设计

渐变开槽天线（Tapered Slot Antenna）具有宽频带、结构灵巧、易于电路集成和组成相控阵列等优点,但是通过分析和设计常规的指数型TSA天线,发现其存在后瓣和旁瓣较大、增益较低的缺点.通过改进天线整体结构和局部开槽的方法,优化了常规TSA天线表面和渐变槽线边缘的电流分布,并利用HFSS设计了一付工作于X波段、KU波段改进型TSA天线,与设计的常规天线TSA相比,天线主辐射方向3dB波瓣宽度增大,最大增益提高,后瓣和副瓣得到了一定的抑制.     

A 150-GHz CPW-fed tapered-slot antenna

An easy method for increasing the substrate thickness of tapered slot antennas (TSA) is presented. With this method, antennas three times thicker compared with conventional designs can be realized, with an almost unchanged performance. The method has been successfully applied to a 150-GHz TSA on quartz substrate. The antenna has been carefully examined theoretically and measured with a field measurement system to determine both amplitude and phase of the radiated field. Finally, and based upon our results, a twin TSA is proposed and theoretically investigated.     

12–20GHz的TSA天线

该文设计并实现了一个用于超宽带(UWB)系统的TSA天线.计算结果与测量结果表明:工作频段为12-20GHz;天线的半功率波束宽度大于40(,方向图随频率的变化很小;天线的最大增益随频率增大而变化,基本呈增大趋势.该TSA天线基本满足UWB系统对天线的要求.     

On-wafer characterization of millimeter-wave antennas for wirelessapplications

This paper demonstrates a deembedding technique and a direct on-substrate measurement technique for fast and inexpensive characterization of miniature antennas for wireless applications at millimeter-wave frequencies. The technique is demonstrated by measurements on a tapered slot antenna (TSA). The measured results at Ka-band frequencies include input impedance, mutual coupling between two TSA's, and absolute gain of TSA     

Characterization of tapered slot antenna feeds and feed arrays

A class of feed antennas and feed antenna arrays used in the focal plane of paraboloid reflectors and exhibiting higher than normal levels of cross-polarized radiation in the diagonal planes is addressed. A model which allows prediction of element gain and aperture efficiency of the feed/reflector system is presented. The predictions are in good agreement with experimental results. Tapered slot antenna (TSA) elements are used as an example of an element of this type. It is shown that TSA arrays used in multibeam systems with small beam spacings are competitive in terms of aperture efficiency with other, more standard types of arrays incorporating waveguide type elements     

Transmission scheduling for wireless mesh network systems equipped with multiple directional antennas

All existing broadcast scheduling algorithms (BSAs) were designed for omnidirectional antenna (OA) packet radio (PR) nodes of a wireless mesh network (WMN). However, when WMN nodes are equipped with multiple directional antennas (DAs), a signal sent from a neighboring node may be received by more than one DA of the receiving node, and some nodes may receive signals from multiple DAs sent from the same node. When existing OA BSAs are used for scheduling transmission time-slots in time division multiple access (TDMA), due to the multiple DA signal detection phenomenon a weak performance in average time delay and channel utilization is obtained. Therefore, a novel transmission scheduling algorithm (TSA) for WMN nodes equipped with multiple DAs is proposed. Simulation results demonstrate that a significant performance gain can be obtained from using the proposed DA-TSA scheme.