C波段高增益圆极化微带天线阵的研制

论述了圆极化微带天线阵的设计方法。以工作频率为5.8GHz,32单元圆极化微带天线阵为研究对象,设计出了与馈电网络为一体、具有圆极化特性的微带天线阵,从而解决了圆极化微带天线阵馈电网络较为复杂、工程实现较为困难这一问题。实验结果表明该天线阵具有良好的圆极化特性,进而说明了该方法是有效可行的。     

弹上微带天线的研究

在目前微带天线的理论设计不完善的情况下,本文探索性地研制了三种不同形式的微带天线阵,即六元谐振串馈式梳形微带天线阵、八元非谐振串馈式矩形微带天线阵以及微带卷绕全向天线;讨论了这些微带天线阵的实用设计方法,并做了大量的理论计算和实际测量,特别是这些实用设计方法可用于设计任意波束指向的微带天线阵,其将来的应用前景极广。理论设计与实测结果基本一致,能满足工程要求。     

高增益宽带圆极化微带天线阵研究

研究了S波段高增益宽带圆极化天线阵的设计方法,讨论了阵列间距与天线增益、E面方向图之间的关系,论述了微带天线阵馈电网络工程实现途径,并研制了S波段高增益宽带圆极化天线阵实验样机,并对天线阵实验样机的电特性进行了测量,测量结果表明,天线最大增益为15 dB时,天线阵的阻抗带宽达到了12.25%,圆极化轴比小于3 dB带宽为9.4%,测试数据充分说明了该天线阵具有尺寸小、高增益、宽频带、圆极化特性,从而验证了设计方法的有效性.     

米波警戒雷达天线小型化研究

分析了单元间距较大的小型天线阵的基本特性，探讨了这种天线阵的设计方法，设计了一个小型大间距八木阵，试验结果表明，这种天线阵增益高，波瓣性能好，是米波警戒雷达天线小型化的有效途径之一。     

基于SE/ DFSS 的相控阵雷达天线阵面设计流程优化和验证

针对相控阵雷达天线阵面设计过程不精细、数据追溯困难、需求分析不充分等问题,运用系统工程和六西格玛设计方法,开展相控阵雷达天线阵面的设计流程的优化,精细化地展开设计活动,建立模板表单,优化设计过程和设计规范,并在相控阵雷达天线阵面的研制中完成流程验证,提升了设计质量和降低研制风险。     

基于FDTD的相控微带天线阵设计与分析

针对相控微带天线阵设计、分析过程的复杂性,提出了用时域有限差分法(FDTD)对微带天线阵进行建模,用仿真软件Emp ire获取数据,结合直线阵理论和传输线理论导出相应的公式,用M atlab进行数据处理的设计、分析方法。用该方法设计了一个七单元相控微带天线直线阵。优化设计后,分析了动态反射系数、方向图等。通过实例将该方法分析结果与仿真曲线进行了对比,其吻合程度验证了该方法的准确性。研究表明,这种方法有利于相控微带天线阵的快速设计。     

某星载SAR天线阵面的游离设计与验证

星载SAR在轨展开后天线阵面平面度影响其电性能,其中,热变形是影响阵面平面度的一个重要因素。基于某卫星大口径、长时间工作、高精度天线系统的结构设计要求,提出了天线阵面的游离设计,运用数值仿真方法分析游离设计安装时热变形对天线阵面平面度的影响,并进一步采用非接触式双相机摄影测量系统开展热变形试验。结果表明,天线阵面热变形仿真与试验数据的一致性较好,采用游离设计可有效降低天线阵面的热变形,满足卫星天线系统的结构设计要求。     

微带加权串馈天线阵的设计与研制

基于简单易行的传输线模型并结合积分方程法,计及微带天线单元间的传输损耗,构建了幅度加权串馈微带天线阵的非线性方程组,通过LM(Lvenberg-Marquardt)方法求解了约束条件下的方程组,获得了串馈加权微带天线阵的设计参数.给出的设计实例表明该设计方法是快速综合微带串馈天线阵的简捷有效方法,理论计算与实验结果吻合.     

高铁监测专用Wi-Fi天线阵

Wi-Fi是一种允许电子设备连接到一个无线局域网的技术,通常使用2.4G特高频或5G超高频频段。高铁Wi-Fi提供的无线信息应用平台,为乘客和客运管理部门提供了便利。设计了一款三阵元Wi－Fi天线阵,分析了该天线阵的性能,对该天线阵进行了电气性能仿真,并对带宽和方向图进行优化设计。最后给出了天线阵的实例,实测结果与仿真设计一致,表明该设计方法正确有效,可广泛应用于高铁上。     

宽频带微带天线阵

本文提出一种用聚苯乙烯泡沫支撑的高效宽频带微带天线阵。给出了这种天线阵的分析、设计方法。理论和实验结果表明能够得到高达６０％的频带宽度。     

Study of the microstrip array

The design considerations of the microstrip array, the analytical expressions of the microstrip antenna (element), the approximate admittance formula of input admittance, and two designed antenna arrays are given. Rather good results have been obtained from the main performance of the designed antenna arrays, such as sidelobe level, VSWR, cross polarization level, and gain etc.     

An analysis of antenna coupling between arrays on a polyhedronstructure

Antenna coupling between arrays on a polyhedron structure is investigated. First of all, a high-frequency asymptotic closed-form formula is derived for the mutual admittance between two linearly polarized circular microstrip antennas located on the different faces of a perfectly conducting wedge. The microstrip antennas are modeled by the cavity model, and the mutual coupling caused by the wedge-diffracted field is analyzed by the EMF method using Keller's GTD diffraction coefficients for the diffracted field. Next, the antenna coupling between arrays is calculated and compared with an experimental result. Good agreement between them supports the theory. Finally, the properties of the antenna coupling are described by some numerical simulations     

共口径波束可控双缝隙耦合微带天线阵设计

针对波束倾角可控天线的小型化和低成本,设计了宽频带双缝隙耦合矩形微带天线单元,组成1×8元线阵,采用2套基于Wilkinson不等功分器的馈电网络实现切比雪夫的幅度分布。具有不同相位差的2套馈电网络,通过不同的缝隙耦合对同一微带单元口径面馈电,分别形成了2种倾角的波束。仿真结果表明,共口径双缝隙耦合微带天线阵实现了90°和75°两种波束倾角的可控切换,是一种体积小、造价低的方向图可重构天线。     

X波段微带天线阵的新型高效馈电方式研究

提出了一种采用波导缝隙和微带线共同给X波段微带贴片天线阵馈电的新型方式.用NFDTD对这种面阵进行数值仿真和设计.已制作出的天线阵的实测结果表明其效率可达68.5%.     

Sensitivity of microstrip antennas to admittance boundary variations

The analysis of microstrip antennas is greatly simplified by a technique which separates the interior fields of the antenna from its exterior fields through the application of an admittance boundary condition at the periphery of the antenna. The goal of this investigation is to determine the accuracy to which one must obtain this "wall" admittance in order to predict operating parameters to a specified tolerance. For a typical microstrip antenna the "wall" admittance must be known to within 4 percent to predict the operating frequency to 0.5 percent.     

Novel low-cost beam-steering techniques using microstrip patchantenna arrays fed by dielectric image lines

This paper presents novel low-cost beam-steering techniques using microstrip patch antenna arrays fed by dielectric image lines (DILs). Two approaches are designed and used. The first, DILs without reflector plate, are used for feeding microstrip patch antenna arrays. Antenna array radiation beams are scanned when the operating frequency sweeps. The second, a dielectric image line with a movable reflector plate (DILWRP), is developed. The beam direction of the antenna array is controlled and steered by changing the perturbation distance between DIL and movable reflector plate at a given operating frequency. Both types of patch antenna array structures are simple, low cost, easily fabricated, stable, and reliable. Eight-element patch antenna arrays fed by DIL and DILWRP have been designed, fabricated, and tested. Experiments show good performance and results. Measurement results of scanning angles agree well with theoretical predictions     

圆极化微带贴片天线的设计与优化

圆极化微带贴片天线的贴片形状是影响天线性能的重要因素,圆极化天线的设计与优化有助于其应用.通过HFSS软件,设计并优化了一副圆极化微带贴片天线,采取S11参数分析,电压驻波比分析,阻抗导纳分析等,确认数据的正确性,优化后的天线达到匹配要求.     

一种高隔离度的双极化微带天线阵的理论和实验

本文提出利用双端口的串行角馈方形帖片实现双极化,并设计了一种共面的双极化馈线网络,综合运用多端口网络模型、腔模理论和分片法,给出了单口双端口天线单元和双极化天线阵列的理论分析。本文法计算简单便,适合于工程应用,实际设计了一副６ＧＨｚ频段的背地里层天线阵,实验测量的双端口隔离度达－４１ｄＢ,其性能明显优于通常的单层双极化微带天线阵,该面阵结构简单、馈线网络较小,且易合并成更大规模的双极化瑚线阵。     

Micromachined reconfigurable out-of-plane microstrip patch antenna using plastic deformation magnetic actuation

A new reconfigurable out-of-plane microstrip patch antenna is presented. Using micromachining processes, a microstrip antenna designed for operation around 26 GHz is covered with a thin layer of magnetic material and released from the substrate. Application of an external DC magnetic field causes plastic deformation of the antenna at the boundary point where it is attached to the microstrip feed line, resulting in a patch positioned at an angle over the substrate. Frequency and pattern reconfigurability are demonstrated with measurements. Results indicate that versions of this structure may be used to expand or enhance the capabilities of traditional planar arrays.     

微带天线理论和技术的进展

本文综述了迅速发展中的微带天线理论和技术的新进展。侧重评述了基本理论和圆极化、宽频带、多频段及馈电等技术的进展,并介绍了毫米波微带天线阵和有源固态相控阵等新型微带阵列。最后展望了发展方向。