毕业设计说明书中文摘要在雷达、电子对抗等系统中，双极化天线已经获得了广泛的应用，采用双极化天线可以在同一带宽内发射两种不同极化的信号，即节约了频率资源，并使频带的利用率提高了一倍。毫米波双极化平面天线主要有微带天线和波导缝隙天线两种主要形式，在Ka波段微带天线损耗较大，辐射效率较低，而波导缝隙天线的损耗较低，辐射效率较高。因此，本文对波导缝隙天线形式的Ka波双极化天线进行了研究。78744

本文首先介绍了平板缝隙天线的研究背景和意义以及发展现状，叙述了平板缝隙天线的各种优点。波导缝隙的辐射特性和分析方法的了解对波导缝隙天线的设计具有重要的作用。辐射缝的各种不同形式对应不同的等效电路，宽边辐射纵缝对应并联导纳，宽边斜缝对应串联阻抗，这些等效电路是下面设计平板缝隙天线的基础。

本文重点介绍了用仿真软件方法来设计平板缝隙天线，我们知道波导缝隙天线的设计关键就是能够得到缝隙的导纳、偏置和缝长之间的关系，得到这些关系曲线就可以得到口径分布对应的各个缝隙的电尺寸，这里的解决方法是通过等效电路结合仿真的方法来得到缝隙的有源导纳。 整阵的仿真结果表明双极化全并馈波导缝隙阵列较传统的串馈双极化波导缝隙阵列具有更宽的阻抗带宽与增益带宽，并且工程实现更简单等特点。

毕业论文关键词  双极化天线、HFSS仿真、Ka波段、波导缝隙阵列

毕业设计说明书外文摘要

Title   Research and Design of The Ka-band Dual-Polarization Antenna Array 

Abstract The dual-polarization antenna has been widely used in radar, electronic-warfare and aerospace systems。 It can emit two different polarization signals on the same frequency, which saved the frequency resource and doubled the band utilization rate。 The dual-polarization planar array in millimeter-wave band mainly uses microstrip antenna and waveguide slot antenna, but in millimeter-wave band, micro-strip antenna has larger loss and lower radiation efficiency than waveguide slot antenna。 So we use wave-guide slot antenna to design dual-polarization antenna in millimeter wave band in this paper。 

This article first introduces the development background and the significance of status of the planar slot antenna and the merit of the taye antennas。 It is very important to introduce the radiation characteristics of the waveguide slots and analysis methods, because it is very uesful to design the waveguide antennas。 Different radiation slots have different equivalent circuits, radiation longitudinal slots corresponds to parallel admittance and oblique slots corresponds to series resistance。 These equivalent circuit are the basic of the following to design the slots antanna array。

This article describes the design of planar antennas using equivalent circuits, It will enable us to gain a deeper understanding of the theory of waveguide antennas。 The simulation results show that the full-corporate feed dual-polarization waveguide slot array has wider VSWR bandwidth and 3dB-Gain bandwidth than the traditional series fed dual-polarization waveguide slot array。 

Keywords  Dual-polarization antenna  HFSS simulation  Ka-band  Waveguide slot array

目   次

1  引言  3

2  波导缝隙天线基本理论 … 6

2。1  理想缝隙天线 … 6

2。2  波导缝隙天线辐射原理 … 8

2。3  波导缝隙主要形式及其等效传输线电路 …… 10

2。4  单脊波导及其V形缝隙基本理论  11

2。5  双极化天线阵列设计方法 …… 13