罗特曼透镜馈电的多波束阵列系统设计

多波束系统广泛地应用于电子战设备中。讨论了基于罗特曼透镜馈电的多波束阵列系统的设计理论和原则,给出了一个16元罗特曼透镜和凹口天线组成的多波束阵列系统,阐述了馈电透镜和阵列天线的设计过程以及设计中的难题及解决办法。     

罗特曼透镜馈电多波束结构设计

介绍罗特曼透镜馈电多波束无线结构设计方法，透镜采用计算机辅助设计，直线阵采用模块化设计。     

基于SICL的宽频带毫米波多波束阵列天线设计

为实现第五代移动通信技术(5G)毫米波阵列天线的多波束扫描,提出了一种基于基片集成同轴线(Substrate Integrated Coaxial Line, SICL)的宽频带毫米波多波束阵列天线。多波束阵列天线主要包括基于SICL的宽频带毫米波罗特曼透镜和基于SICL馈电的宽频带磁电偶极子天线,罗特曼透镜腔体采用平板波导结构,移相段采用非色散结构SICL,设计了一种平板波导透镜腔体和SICL移相段的宽频带匹配结构实现宽频带罗特曼透镜。采用SICL耦合馈电的宽频带磁电偶极子天线作为多波束阵列的辐射单元,易于直接与基于SICL的罗特曼透镜连接使用,可实现宽频带波束扫描。基于此设计了一种7个波束端口、9个阵列单元的宽频带多波束阵列天线。仿真结果表明,该罗特曼透镜的-10 dB阻抗带宽约为42%(20.5～31.5 GHz),磁电偶极子天线的-10 dB阻抗带宽约为45%(20.5～32.5 GHz),组成的多波束阵列天线在20.5～31.5 GHz(约42%)频带内可实现±30°的波束扫描,天线结构简单紧凑、剖面低、易集成且能实现宽频带波束扫描,适用于5G毫米波通信。     

某罗特曼透镜主壳体插座孔加工工艺的改进

罗特曼透镜广泛运用于各种微波馈电网络的设计之中,而主壳体作为罗特曼透镜核心的微波件,其插座孔在加工过程中常面临难度大、成本高和加工效率低的问题.引入新的加工编程软件,对孔径加工工艺进行了改进,采用多轴联动的钻削工艺,成功地解决了插座孔的加工难题.经过实测数据对比,该方案有效提高了生产效率.     

罗特曼透镜多波束发射阵的结构设计

介绍一种１６元６１波束罗特曼透镜多波束发射阵结构设计，设计中遵特微波天线电气特性与结构设计一体化的思想，运用ＣＡＤ优化设计技术，并对电磁兼容进行充分的考虑，使天线阵设计取得了较好的总体效果。     

电子战功率合成技术原理及应用

通过分析功率合成的原理，理论上将大功率干扰的合成技术分为两种：通道功率合成技术、空间功率合成技术，并给出这两种功率合成技术的典型应用范例。对于前者，根据魔合成效率与两支路幅度、相位误差的关系曲线，得出理论上所要求达到的幅相控制误差，可用于指导工程应用；对于后者，以罗特曼透镜为例，给出一个改进的透镜设计方程，简化了透镜参数值的计算。     

快速响应模式电极pi-cell液晶透镜的研究

为提高传统模式电极液晶透镜的响应速度,本文设计了模式电极pi-cell液晶透镜。结合液晶连续体理论和模式电极液晶透镜电阻-电容等效电路,提出一种快速的计算方法对液晶透镜进行模拟仿真,仿真结果与实际器件的测试参数具有良好的一致性,显示了此仿真方法具有较高的精度,并依据仿真结果设计了模式电极pi-cell液晶透镜的驱动条件。实验制备了模式电极pi-cell液晶透镜并研究了其光学特性,结果显示此液晶透镜具有较大的焦距调节范围和良好的成像效果,对比于参数相近的模式电极平行排列液晶透镜,模式电极pi-cell液晶透镜的响应时间为136ms,比平行排列液晶透镜减少368ms,响应速度显著提高。     

基于罗特曼透镜的宽带多波束天线系统

宽带多波束天线系统广泛应用于电子侦察领域。为了实现宽带、宽角扫描,波束形成网络需采用实时延时单元。针对这一需求,介绍了一个由宽带天线阵列、射频前端和罗特曼透镜等组成的宽带多波束天线系统,详细描述了系统的组成及工作原理、单元设计、副瓣电平仿真、校正和测试。测试结果表明,系统能够实现多波束的小角度扫描,减小扫描波束的灵敏度损失;在8~12GHz频率范围、±27°方位覆盖范围内,多波束的峰值副瓣电平达到-20dB。应用结果表明该系统具有较强的空域抗干扰能力。     

面阵半导体激光器的耦合理论设计

用光线追迹方法计算了面阵半导体激光器的光束在透镜导管内传播及分布情况。理论给出了设计透镜导管时主要考虑的参数及其选取原则,在输出平面上得到了近高斯分布的激光输出,理论表明,利用透镜导管对面阵半导体激光器进行耦合能够获得高功率密度的光束输出,这种方法将是今后高功率全固态激光器耦合系统的主要耦合方法。     

一种应用于激光微烧蚀的光学聚焦系统简化设计方法

针对激光微推力器对光学聚焦系统结构紧凑、聚焦光斑尺寸小以及避免羽流污染的特殊要求,采用传统的光线追迹法研究单透镜直接聚焦、双透镜准直聚焦两种典型方案光学设计方法。针对低功耗半导体激光器光纤耦合输出的芯径和数值孔径条件,在50m级聚焦光斑约束下,研究单透镜聚焦系统设计方案,得到了透镜厚度、焦距、工作距等设计参数的关系;研究准直聚焦光学系统的双透镜系统设计方案,得到了透镜厚度、透镜中心距、工作距等设计参数特征关系。针对两种典型光学设计方案,给出了工程应用设计参数。文中提出的设计方法避免了复杂的光学设计过程,可为激光微推力器激光光束微尺度聚焦提供一种简单实效的方法。     

An improved design method of Rotman lens antennas

A Rotman lens is used to feed a linear array antenna for wideband use. A relationship between design parameters for realizing a Rotman lens has been derived by introducing a new design variable. The design method which minimizes the phase error on the aperture of the linear array antenna has been shown. For large array length, the above phase error due to this method becomes considerably smaller than that due to a conventional method. This improved method makes it possible to design small and low-loss Rotman lens antennas.     

基于带状线形式的宽带Rotman透镜设计

针对宽带多波束网络的需求,设计了一个32天线端口,24波束端口,扫描±45°基于带状线形式的Rotman透镜。通过全场仿真计算,分析了透镜波束端口到阵列之间S参数的幅度、时延特性,并据此计算了Rotman透镜的各个波束在不同频率的方向图。通过波束计算分析,发现基于微带形式的Rotman透镜相对于基于带状线形式的Rotman透镜在超宽带工作时有明显的色散效应。按照所做的基于带状线的透镜设计,制作了Rotman透镜测试样机。通过对样机的端口间幅度相位性能测试,对比分析了仿真和测试结果,验证了设计的Rotman透镜的超宽带波束扫描性能。     

Design trades for Rotman lenses

The foundation of a satisfactory Rotman lens design is geometric. The effects of seven design parameters (focal angle, focal ratio, beam angle ratio, maximum beam angle, beam port curve ellipticity, array element spacing, and focal length/λ) on the shape, and on the geometric phase and amplitude errors of a Rotman lens are described. The advantage of beam port shaping to reduce phase error, and of pointing port horns at the opposite apex (instead of normal to the curve) to reduce off-axis beam amplitude asymmetries, are shown numerically. A design procedure for selecting these parameters is given, and a calculation of lens gain is presented     

分块法与轮廓积分法相结合分析Rotman透镜

Rotman透镜馈电网络是产生多波束体制的一种有效手段，越来越多地用于雷达、预警系统和个人通信系统中。本文全面阐述了以分块法为指导思想，结合轮廓积分法分析Rotman透镜的过程，并详细叙述了利用分块法时的一些处理技巧，藉此可使计算量减少为原来的1／3。以上方法不仅可用于任意形状、任意无数、任意频率的Rotman透镜分析，还适用于Rotman透镜的计算机辅助设计。     

Dielectric Slab Rotman Lens for Microwave/Millimeter-Wave Applications

A new form of a Rotman lens is proposed for microwave/millimeter-wave applications such as a collision-avoidance radar. The proposed lens can be described as a dielectric slab fed by slot lines. The new form is expected to show lower loss and lower mutual coupling than the conventional Rotman lenses fabricated with conducting plates at millimeter-wave frequency. Taking the field distribution inside the dielectric slab into account, the$ TE_0$mode was chosen to excite the dielectric slab lens. The dielectric Rotman lens consists of a dielectric slab, tapered slot structure, and the transitions between the antipodal slots and microstrip lines for subminiature A connectors. The conventional design equations have been modified for use in designing the dielectric slab Rotman lens with a high dielectric material. A prototype was implemented with nine beam ports and nine array ports. Measurements from 10 to 20 GHz show that mutual coupling can be lowered at higher frequency. The obtained efficiency of the dielectric slab lens system is approximately 30%. The efficiency of the lens is comparable to that of the conducting plate lenses even though there is a spillover loss from the dielectric slab.     

透镜的设计技术

介绍了Rotman透镜波束形成网络的特点，给出了设计方程以及设计要点，最后给出了一个模型透镜的测试结果，其值达到了预定的指标。     

Design of Rotman lens for beamsteering of 94 GHz antenna array

The design and development of a Rotman lens for operation at 94 GHz which feeds an antenna array for beamsteering applications is presented. The construction is completely realised in waveguide technology. The lens consists of 15 beam ports covering a scan range of /spl plusmn/23.3/spl deg/ in steps of 3.3/spl deg/ and 10 array ports connected via phase compensating transmission lines to a linear antenna array. Experimental results are compared with theoretical calculations.     

Procedure for correct refocusing of the Rotman lens according toSnell's law

A procedure is derived for proper refocusing of a dielectric-filled Rotman lens with beam port locations determined according to Snell's law. The theoretical performance of such a lens is compared with that of a conventional design at wide scan angle and the design equations for correct refocusing of the refracting lens derived. The approach provides an alternative lens configuration which may give a wider field of scan, at a given focal length, for lenses fabricated in microstrip or stripline. The presence of grating lobes in the lens is discussed     

An experimental completely overlapped subarray antenna

A completely overlapped subarray antenna was designed, fabricated, and tested to demonstrate its broad-band, low sidelobe, wide scan angle performance. It uses time delay steering at the inputs to a transform feed, which illuminates a phase-shifter steered objective lens. The transform feed is a Rotman lens and the objective is a cylindrical bootlace lens, both of which are parallel plate waveguide cavities with coaxial probe elements. The signal bandwidth goal of 20 percent (8.1-9.9 GHz) at55degscan was met easily, however, achieving the peak sidelobe goal of - 30 dB proved more difficult because of internal reflections in the Rotman lens beamformer. A brief summary is presented of the completely overlapped subarray antenna (COSA) concept to explain the detailed design of our experimental model. Antenna pattern and S-parameter measurements illustrate the operating principles, the difficulties encountered, and the results achieved.