一种超低副瓣的曲面的天线阵的分析与设计

园柱共形DBF天线阵中,由于天线阵中各个分天线不在同一平面上,边缘的分天线存在相当程度的绕射,这种绕射使得在进行DBF合成时,天线的方向图比较容易出现高的栅瓣.本文通过分析表明,低的副瓣与需要合成的部分分天线构成的圆心角以及分天线的反射板的尺寸有重要的关系.     

一种新型布局的圆极化微带天线阵优化设计

提出了一款高增益低副瓣新型圆极化微带天线阵。单元天线采用叠层切角圆极化微带结构,通过八边形边界布局和顺序旋转交叠组阵技术,实现了天线阵方向性图的对称性和圆极化辐射性能的最优化;馈电网络采用威尔金森功分器和最大平坦式阻抗变换器实现不等功分宽带阻抗匹配,通过改进馈电方向寻求对称结构,简化了馈电网络的设计。制作了天线阵实物并进行了测量。测试结果表明:天线在3.2~4.6 GHz频段内S₁₁<-10 dB,阻抗相对带宽36%;在3.8~4.5 GHz频段内顶点轴比小于3 dB,圆极化相对带宽17%;在4~4.4 GHz频段内天线增益均在15 dB以上,最高增益达17 dB。     

一种用于交通测速的毫米波天线阵的设计

基于交通测速雷达高精度、轻型化和小型化等要求,给出了以一种可用于交通测速的毫米波天线阵的设计。天线阵采用串并混合馈电方式,对天线单元以及馈电网络进行独立设计,对天线阵进行一体化设计和加工验证。天线阵采用串、并联方式进行馈电,从而实现天线单元幅度的泰勒分布,使得天线阵在24~24.25 GHz的工作频段内,在E面和H面均获得小于-20 d B的低副瓣性能。整部天线阵具有轻型化、低副瓣和高增益等特点,满足作为交通测速雷达的需求。     

应用于引信系统的一种W波段SIW缝隙天线阵的设计

将驻波缝隙阵天线中的并联缝隙等效为微波电路,按照传输线方程推导了缝隙导纳的计算公式,用仿真软件提取了缝隙参数,拟合出了谐振缝长随偏移量的变化曲线、谐振电导随偏移量的变化曲线,设计了一个10单元的端馈的W波段SIW缝隙天线阵,具有低剖面、宽带、低副瓣的特性,满足引信天线设计的要求。     

一种宽带圆极化天线阵的设计

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。     

一种新型介质棒天线

提出了一种用作馈源的终端加载球形的介质棒天线,并给出了该介质棒天线的设计方法,分析了影响介质棒天线副瓣电平和波束宽度的因素。该介质天线可以用作工程上特定的馈源。     

高增益低副瓣圆极化微带天线阵的研制

以工作频率为4.14 GHz,5单元圆极化微带天线阵为研究对象,研制出了与馈电网络为一体、具有圆极化特性的微带天线阵.利用不等幅馈电网络实现了天线方向图的低副瓣,采用枝节匹配技术解决了圆极化微带天线阵与馈电网络为一体的工程实现较为困难这一技术难题.在此基础上,研制了天线阵实验样机,并对实验样机进行了测量,实验结果表明;该天线阵具有良好的圆极化特性和低副瓣特性,进而说明了该方法是有效可行的.     

24GHz边馈式微带天线阵的设计

为24 GHz车载防撞雷达收发前端设计并制作了一款高增益易集成的微带阵列天线。该天线阵采用改进的新型并联馈电网络,在满足各阵元激励等幅同相的基础上,减少了馈线损耗和各种杂散辐射,从而提高了天线增益与极化纯度,同时减小了天线尺寸。测试结果表明,所研制的4×8元微带天线阵带宽为24.0~24.2 GHz(电压驻波比VSWR<1.4),最大增益达19 dBi,其尺寸仅80 mm×36 mm。     

微带串馈天线阵的理论分析和仿真设计

论述了微带天线的基本理论、经典分析方法、天线单元的馈电方法以及微带阵列天线的形式、特性及馈电网络,从毫米波天线单元入手,研究了16元矩形微带贴片天线阵的设计方法,并给出了仿真结果,与理论计算值相符。     

串馈型光控相控阵技术机理研究

讨论了光电子技术在宽带宽角扫描相控阵雷达中的应用和优点,简述了光控相控阵天线的工作原理和发展状况.着重分析了串馈型光控相控阵列系统发射机的系统构成和工作原理,建立了串馈型光控相控阵列系统工作在发射模式的数学模型,并进行了理想模型的计算机仿真,最后分析了串馈型光控相控阵的优势并展望了其广阔的应用前景.     

Microstrip antenna array with series-fed `through-element? coupled patches

A new microstrip antenna array with series-fed patches is proposed. To reduce the length of feeding lines the `through-element' feeding technique has been developed. A microstrip patch in which the input feeding line is directly connected and the output line is coupled to a patch is investigated. By adjusting the length of the coupling region an appropriate coupling level is achieved. A 4times1 antenna array operating within the 24 GHz frequency band for radar sensor applications is designed using the proposed feeding technique     

非规则几何结构平面阵列的DOA估计性能

由于受实际环境的限制,天线阵的布设受到一定的约束,而实际测向环境限制了天线阵列的阵列结构,阵列结构是否合理将直接影响测向的精度。针对特定环境对阵列结构的特殊要求及二维测向的实际问题,建立了非规则几何结构阵列进行二维测向的数学模型,研究了基于MUSIC算法的非规则几何结构阵列的二维测向问题,对非规则结构阵列的阵列结构对测向模糊性的影响进行了分析,以矩形平面阵列和任意形平面阵列为例,对两种阵列的测向性能进行了仿真比较,结果证明,提出的数学模型对非规则结构平面阵列的研究具有有效性,可广泛应用于任意平面空间的二维测向。     

Synthesis method of series-fed microstrip antenna arrays

A method for non-uniformly spaced series-fed rectangular microstrip array synthesis is given. By this approach the problem of patch array design turns out to be slot array synthesis. The resulting equivalent configuration gives the necessary parameters for the microstrip array geometry. Applications on Taylor, Bayliss and shaped-beam patterns show the validity of the method     

Low-cost antenna of series-fed printed strip dipoles

A newly developed antenna comprising series-fed printed strip dipoles is described. The effect of substrate permittivity on the radiation properties of the antenna is investigated, using an analysis model based on the general concept of the equivalent radius of cylindrical antennas. An antenna with a gain of >9 dB and VSWR⩽1.5 over the frequency range 1.8-2.2 GHz is presented     

Design of a minimum-loss series-fed foldable microstrip

The design and analysis of a series-fed, low-loss, inverted microstrip array antenna, operating at 1.413 GHz is presented. The array antenna is composed of two subarrays consisting of an equal number of microstrip patches connected together through a series microstrip line. The subarrays are coaxially fed 180/spl deg/ out of phase. This approach ensures a symmetric radiation pattern. The design approach for obtaining a low sidelobe ratio and a low loss microstrip array is accomplished using the IE3D code. Experimental and simulated data are presented and discussed.     

The synthesis of patterns using a series-fed array of annularsector radiating line (ANSERLIN) elements: Low-profile, circularlypolarized radiators

A series-fed, circularly polarized array of annular sector radiating-line elements that operates over a ground plane and has a low profile is presented. Pattern shaping can be achieved through control of the fraction of the incident power that is radiated by each element. This can be accomplished over a wide range by a simple adjustment in the geometry of each element. A synthesis technique is given, and experimental results are presented. The array is demonstrated to have a high return loss (good impedance match) and a low axial ratio     

含不规则子阵的阵列低副瓣特性研究

对含不规则子阵固态有源相控阵进行了多阶振幅量化,并对其低副瓣特性进行了研究.研究结果表明,利用较少量化台阶数,多阶振幅量化阵可实现较低的副瓣电平.该方法有利于减少组件品种和设计成本,适于工程应用.给出设计实例,验证了不规则子阵多阶振幅量化的正确性.最后,分析了随机幅相误差和单元(或T/R组件)失效对峰值副瓣电平的影响.     

Analysis and design of series-fed arrays of printed-dipolesproximity-coupled to a perpendicular microstripline

An analysis of a printed dipole element and a generalized configuration of a series-fed array of such elements, electromagnetically coupled to a covered microstripline running perpendicularly under it in a substrate-superstrate configuration, is presented. The solution is based on the principle of reciprocity and is formulated using a rigorous method of moments and full-wave spectral-domain Green's functions for multilayer dielectric substrates. The dipole excitation is characterized by an equivalent impedance, and can be controlled by suitably selecting the offset of the dipole from the feed line. Mutual coupling between dipoles is included. Using the results of the element analysis, a series-fed array prototype has been successfully designed, built, and tested in a standing-wave configuration; the design details are described, and measured performances are evaluated using the results of the array analysis. Mutual coupling effects are found to be not detrimental for this configuration, but can be severe for other nonstanding-wave configurations     

Design of dual-polarized series-fed microstrip arrays with low losses and high polarization purity

The design of a dual-polarized microstrip series-fed linear traveling-wave array is described in this paper. The array is composed of two identical subarrays formed by cascading an equal number of four-port aperture-coupled cross-patch elements and terminated on a two-port radiating matched load. By properly exciting the array, dual linear or circular polarization can be accomplished and by virtue of the symmetric arrangement of the antenna cross-polarization is annihilated. A straightforward design strategy is proposed for the synthesis of a desired current distribution along the array antenna. Some proof-of-concept linear arrays are developed and the corresponding numerical results, obtained through a full-wave approach based on the method of moments (MoM), are provided. As an independent validation, supplementary analyses by the finite integration technique (FIT) are also reported. Very close agreement is found between prescribed and synthesized array performance, which qualifies the proposed design approach as an accurate and effective tool for the synthesis of series-fed aperture-coupled patch arrays.     

A parasitic slot array

The analysis of an endfire array of tunable parasitic slots is described. Self and mutual admittances between thin half-wavelength slots are found by an application of Babinet's Principle. To solve the circuit equations of the array, the condition is imposed that the phase velocity remain constant along the array. Then, by matrix inversion, the excitation amplitude and self-reactance of the parasitic elements are determined. The phase of the reflector is chosen to maximize the coupling between the driven element and the directors. Finally, experimental patterns are compared with computed results.