ID 原文 译文
13714 为了解决这一问题, 提出利用基于遗传算法参数优化的余弦窗函数对近场数据进行加权处理的方法来有效减小截断误差。 In order to solve the above problem, the weighted process method of the near-field data by the cosine window function with the parameters optimized by genetic algorithm (GA) is presented to effectively reduce truncation errors.
13715 以半波振子组成的矩形平面阵作为待测天线, 对相控阵天线球面近场测量进行了计算机模拟。 With the rectangular planar array made up of half-wavelength dipole as the antenna under test, the spherical near-field measurements of phased array antennas are studied by computer simulation.
13716 模拟结果表明, 通过对近场数据进行加余弦窗的处理并用遗传算法对参数进行优化能够大大减小相控阵天线波束扫描时的有限扫描面截断误差, 从而证实了文中所提出方法的正确性和有效性。 The simulation results show that the truncation errors caused by finite scan sphere as the beam of the phased array antenna scans can be greatly reduced by processing the near-field data with cosine window function and optimizing the parameters with GA, which proves the correctness and validity of the method presented in this paper.
13717 研究了一种等弧距单臂半球柱面螺旋天线, 其具有宽带、小尺寸、圆极化、低剖面等特点。 A single arm hemisphere cylindrical helical antenna with equal arc distance is studied in this paper, which has the characteristics of broadband, small size, circular polarization, low profile and etc.
13718 该天线采用半球柱面螺旋天线结构, 通过在馈电端引入等效L节匹配网络进行阻抗变换, 扩展天线带宽, 最终实现了天线的小型化、圆极化及超宽带。 The structure of hemisphere cylindrical helical antenna is employed.The equivalent L matching network is introduced in the feed port to make the impedance matched, which expanses the antenna bandwidth. The miniaturization, circular polarization and ultra-wideband of the antenna are realized.
13719 利用HFSS仿真软件对半球柱面螺旋天线结构参数进行优化, 仿真及测试结果表明, 该天线具有超过30%的阻抗带宽及超过20%的轴比带宽, 最高增益能够达到9dB, 具有良好的辐射特性。 The structure parameters of hemisphere cylindrical helical antenna are optimized by HFSS simulation software.The simulation and test results show that the impedance bandwidth of the antenna is more than 30% and the axial ratio bandwidth of the antenna is more than 20%.In addition, the maximum gain of the antenna can achieve 9 dB. All these properties indicate that the antenna has good radiation characteristics.
13720 针对电小甚低频发射天线辐射电阻小, 地损耗影响天线辐射效率的问题, 文中研究了基于解析法计算分区域均匀辐射状地网区内磁场损耗电阻、电场损耗电阻和地网区外磁场损耗电阻、电场损耗电阻的方法, 根据该方法可实现对分区域均匀辐射状地网的损耗电阻计算。 To solve the low radiation efficiency of the very low frequency (VLF) electrically small transmitting antenna, which is caused by the low radiation resistance and ground loss, the computations of both the magnetic loss resistance and the electric field loss resistance inside or outside the uniform radiated ground network area are studied with analytical method. According to the method, the loss resistance in various regions of uniform radial ground network can be calculated.
13721 计算结果表明, 电小甚低频发射天线的磁场损耗电阻是地损耗的主要部分。 The computational results show that the loss of magnetic field resistance is the main part of the ground loss.
13722 此外, 在地网总长度和地网敷设区域半径不变的条件下, 均匀辐射状地网并不是甚低频天线的地网敷设最佳模式。 Besides, the uniform radial network is not the optimal mode for laying the ground grid under the condition that the total length of the ground net and its area radius are constant.
13723 基于上述结果, 提出通过分区域敷设均匀辐射状地网的方法来降低地损耗电阻, 为进一步提高电小天线的辐射效率提供了一种新的途径, 具有一定的理论和工程实践指导意义。 Based on the above results, a new method for reducing ground loss resistance by laying uniform radial ground nets for various regions is proposed, which provides a new approach for further improving the radiation efficiency of electrically small antenna and is also of certain theoretical and practical value.