摘要近些年来，无线移动通信技术不断发展，变得日新月异。随着第四代无线通信技术的发展，为了扩大通信系统容量，解决多径衰减等问题，无线通信基站使用的天线需要实现双极化、宽带化和多频化等特性。在雷达、电子对抗等系统中，双极化天线已经获得了广泛的应用。80300

本文对双极化天线的基本原理进行了研究，选用垂直极化和水平极化两种天线，设计了2×4的X波段双极化天线阵列。天线分别采用脊波导宽边纵缝和脊边V缝缝隙天线实现垂直极化线阵和水平极化线阵，下层馈电波导通过H缝对辐射线阵进行馈电。文中对两种极化线阵以及线阵组成的面阵分别进行了仿真，并且对双极化天线阵列整阵进行了仿真。仿真结果中，中心频率10GHz处天线整阵增益为21dBi,垂直极化面阵的交叉极化电平约为-38dB，水平极化面阵交叉极化电平约为-45dB。

毕业论文关键词  双极化天线  X波段  波导缝隙阵列  脊波导

毕业设计论文外文摘要

Title     Design and research of X-band dual-polarized antenna array                                         

Abstract In recent decades, wireless mobile communication technology developed rapidly。With the development of the fourth generation of wireless communication technology, we need to improve the expand the communication capacity of the communication system and to solve the problem of multi-path fading, etc。,the wireless communication base station antenna must be ameliorated。The antenna need to be dual-polarized, and can be used in multi-frequency。 In radar and electronic countermeasure system, the dual-polarized antenna has been widely used, the dual-polarized antenna can transmit two different polarization signals in the same frequency band, which economizes frequency resources and doubles the frequency utilization。

In this paper,some basic concepts and applications of the dual-polarized antenna are introduced。In this paper, one vertical-polarized and one horizontal-polarized antenna are adopted,and one 2×4 X band dual-polarized antenna array is designed。The upper radiation waveguide is fed through a H slot by the feeding waveguide in the lower layer。 In this paper, different forms of ridge waveguide slot antennas are designed to achieve vertical and horizontal polarization。The whole dual-polarized antenna was simulated,at the frequency of 10 gigahertz,it has a gain of 21 dBi。The vertical-polarized array has a cross polarization level of -38 dB,and The horizontal-polarized array has a cross polarization level of -45 dB。

Keywords :Dual-polarized antenna  X-band  Waveguide slot array  Ridge waveguide

目   次

1  引言 1

1。1  研究背景和意义 1

1。2  研究现状 1

1。3  本文的主要内容 2

2  波导裂缝天线原理和极化 4

2。1  矩形波导裂隙天线介绍 4

2。2  天线极化 8

2。3  脊波导介绍 9

2。4  波导缝隙的极化与极化单元的选择 13

3  双极化天线阵列的设计 14

3。1  单脊波导参数 14

3。2  缝隙参数计算 16

3。3  双极化天线结构