基于极化敏感阵列的导航抗干扰方法

对于全球卫星导航系统的接收终端,抗干扰处理能够提高其干扰容量,是一项非常重要的工作。提出了一种改进的基于双极化天线阵列的联合极化-空域自适应处理方法进行干扰抑制。仿真实验表明,此方法能够有效降低干扰性,并且不需要知道干扰信号的先验信息,能够适用于卫星导航信号处理。     

毫米波四脊方波导的研究

采用模式匹配法详细分析毫米波四脊方波导的传输特性。首先将对称加载四脊的方波导横截面分成三个子区域,将其中的电磁场分量用模式函数和的形式分别展开,通过在区域交界面上施加边界条件得到展开系数,进而得出本征方程。接着采用数值计算方法求出本征值和特性阻抗等重要参数,与参考文献中的结果比较吻合。最后采用上述方法设计了工作频段为18-40GHz的四脊方波导,它可用于毫米波双极化或圆极化宽带喇叭天线的馈源传输线。     

TD-SCDMA 4+4双极化联合赋形天线组网性能研究

研究了用4 4双极化联合赋形天线进行组网的网络性能,对比了4 4双极化联合赋形天线与传统8天线和6天线的组网性能差异,给出了4 4双极化联合赋形天线进行TD组网的建议。     

Research on dual-polarized circular waveguide antenna fed by L-shaped probes

This paper researched a kind of dual-polarized and cylindrical waveguide antenna fed by two L-shaped probes at the antenna bottom. The designed antenna was composed of two orthogonal L-shaped coaxial probes and a cylindrical waveguide cavity. The two orthogonal field structures were excited and the dual-polarized radiation mode was formed. The feeding cables of two polarization ports went through the bottom of the cylindrical cavity and were connected with the microwave adaptors. The bottom feeding structure was suitable to constitute a planar antenna array. The electromagnetic simulation and optimization design of the proposed antenna were carried out by using the full wave electromagnetic simulation technique, and the simulation results showed that the isolation between two polarization ports were more than 20 dB within the frequency range of 4.8–5.4 GHz. At the center frequency, the cross-polarization levels of radiation pattern were lower than −21 dB at the boresights and the beam width of radiation patterns at E-plane and H-plane were more than 70° for two polarization ports. The designed antenna in this paper was fabricated and measured. The measurement results indicated that the designed antenna achieved anticipated radiation performances and design effectiveness of the dual-polarized antenna in this paper was proved. The dual-polarized and cylindrical waveguide antenna is suitable for some application fields such as dual-polarized array radar. The research results in this paper can provide a technical basis for the practical engineering application.     

一种基于DGS的宽带双极化三角元微带天线

本文设计并研制了一种含缺陷地板结构(DGS)的宽带双极化等边三角形微带天线单元.通过在贴片天线地板上刻蚀圆孔实现DGS结构.天线工作在2.4GHz频率上,VSWR≤2的带宽为7.2%,绝对带宽173MHz,比不带DGS结构的同类天线带宽增加60MHz.     

一16元Ku波段微带天线阵的设计

设计了一适用于Ku波段的宽频带高隔离度双线极化16元微带贴片天线阵。用商业应用软件IE3D对天线电特性进行仿真计算,并制作了实验模型。测量结果与仿真结果吻合良好,两馈电端口驻波小于2的阻抗带宽分别为20.17%和25.74%,隔离度高于32dB,实测增益17.9dBi。     

一种新型正交双极化渐变槽线天线

提出了一种新型的正交双极化渐变槽线天线.它具有宽频带、高隔离、低交叉极化的特性.文中首先研究了该渐变槽线单元各结构参数与天线性能的关系,以此为基础设计了正交双极化的渐变槽线天线,在4.9∶1频带范围内VSWR小于2∶1,两端口间的隔离度优于25 dB.因此,该天线可用作移动通信的基站天线.