人工神经网络基双频RFID读写器天线设计

给出了结合人工神经网络进行双频RFID读写器天线的优化设计方法,该天线由一层双边开槽贴片,厚空气层及接地层的加载缝隙耦合实现双频工作.以天线电磁仿真结果作为人工神经网络模型的训练数据,以天线贴片的四个关键结构尺寸作为神经网络模型的输入参数,以天线回波损耗作为输出参数,实现天线的快速优化设计.所设计天线的性能指标为:在驻波比小于2.0时,低频段(900 MHz)的工作带宽约为70 MHz(870～940 MHz),高频段(2.4 GHz)的工作带宽约为300MHz(2.235～2.535 GHz);天线尺寸为179.3 mm×120 mm.神经网络模型和电磁仿真结果吻合良好.     

基于相控阵天线的“动中通”卫星通信终端研究

提出了一种新的“动中通”卫星终端的设计思路。主要从研究当前国内主流的“动中通”卫星通信终端着手,分析了在“动中通”卫星通信终端中采用相控阵技术的可行性,给出了一个典型的相控阵“动中通”卫星通信终端的实现框架,并进行了可工程实现的收发分离相控阵“动中通”卫星通信终端具体设计,提出设计关键点。     

CDMA无线网络向EV-DO升级方案分析

介绍了CDMA网络演进路线,以及现有的CDMA 1X网络向1XEV-DO网络平滑过渡的升级方式.针对现网扩容升级中存在的一些问题,建议CDMA网络EV-DO升级与基站搬迁结合起来,以减少无线网络的反复割接,有利于CDMA网络的长期发展.     

Antenna Performance of a Directly Dug Corrugated Feedhorn for the 150-GHz Band

We have developed a 150 GHz band corrugated feed horn. These corrugated feed horns have been established by a new machining method, which involves digging corrugations through a metal material. We were able to realize E plane and H plane symmetry, low side lobe level, and low cross-polarization level. Measured co-polarization beam patterns above − 35 dB were consistent with the simulated patterns within a designed frequency range. The peak levels of cross-polarization beam patterns were less than − 30 dB. And, the performances were uniform in several horns. In the present paper, we describe the corrugated horn produced by this methods.     

一种5G移动通信干扰信号定位系统

当前,运营商5G网络的部署涉及大量的频段重耕,5G行业业务又面临复杂的电磁环境,如何准确、高效的定位5G干扰源是目前业内聚焦的重要课题.本文设计了一种5G移动通信干扰信号定位系统,创新使用了方位双定向、四天线接收和高精度筛选定位等多项技术方法,能实时、高精度地定位干扰源位置,并实现了测试、分析和派单全流程的自动化处理,...     

Antenna selection for MIMO system based on pattern recognition

This paper proposes a novel Multiple-Input Multiple-Output (MIMO) transmission scheme based on Pattern Recognition (PR), which is termed as the PR aided Transmission Antenna Selection MIMO (PR-TAS aided MIMO). As the conventional TAS algorithms need to search all possible legitimate antenna subsets, they may impose some redundant calculations. In order to avoid this problem, we employ some pattern recognition methods to carry out the TAS algorithm in this paper. To be specific, two PR algorithms, namely the K-Nearest Neighbor (KNN) algorithm and the Support Vector Machine (SVM) algorithm, are introduced and redesigned to obtain a TAS with lower complexity but higher efficiency. Moreover, in order to improve the performance of the SVM, we propose a new feature extraction of channel matrix for the TAS. Our simulation results show that the proposed KNN and SVM based PR-TAS algorithms are capable of striking a flexible tradeoff between the complexity and the Bit Error Rate (BER), and the new feature can effectively improve the BER performance compared with the conventional feature extraction method.     

Estimation of Antenna Correlation Coefficient of N-Port Lossy MIMO Array

This paper proposes a simple yet accurate method for estimating the antenna correlation coefficient (ACC) of a high-order multiple-input multiple-output (MIMO) antenna. The conventional method employed to obtain the ACC from three-dimensional radiation patterns is costly and difficult to measure. An alternate method is to use the S-parameters, which can be easily measured using a network analyzer. However, this method assumes that the antennas are highly efficient, and it is therefore not suitable for lossy MIMO antenna arrays. To overcome this limitation, we define and utilize the non-coupled radiation efficiency in the S-parameter-based ACC formula. The accuracy of the proposed method is verified by the simulation results of a 4-port highly coupled lossy MIMO array. Further, the proposed method can be applied to N-port arrays by expanding the calculation matrix.     

采用高增益塔康天线构建战术导航网

通过对塔康导航系统作用距离的估算,得出提高塔康导航系统作用距离的有效措施是提高塔康系统地面信标天线的增益,建议塔康地面信标采用高增益塔康天线构建战术导航网络。     

航管一次雷达维修测试平台研究

航管一次雷达维修测试平台是在国产航管一次雷达基础上,具有设备维修、维护、软件升级、雷达模拟、人员培训等功能,以满足技术保障人员对雷达设备维护、维修的要求。该测试平台按照功能可化分为维修参考系统、维修测试工装和维修测试软件等。本文叙述了航管一次雷达维修测试平台的设计原理和系统组成。     

新型小板状天线覆盖地下车库方案研究

本文主要研究了新型小板状天线对于地下车库的覆盖,从电磁辐射、覆盖效果、信号外泄、投资情况等方面分析,并与传统的吸顶天线覆盖方式进行综合对比,发现新型小板状天线覆盖地下车库的方式具有覆盖效果好、辐射与外泄可控、方便施工及维护、投资较低等特点,从而总结得出相关推广设计规范及应用注意事项。