宽带滤波器和Vivaldi天线的研究与设计

发布时间：2018-05-14 01:22

本文选题：超宽带(UWB) + 带通滤波器(BPF)　；参考：《电子科技大学》2017年硕士论文

【摘要】：随着无线通信技术,尤其是其中的微波和毫米波技术的迅猛发展,对应用于各类通信系统中的无源器件就提出了越来越高的要求。超宽带技术因为有着很宽的工作带宽、良好的保密性能以及很高的传输率等特点受到了极大的关注。超宽带带通滤波器和宽带天线是整个超宽带系统中不可或缺的器件,决定着整个通信系统的通讯质量。因此对超宽带无源器件(超宽带滤波器、超宽带天线等)的研究就显得十分重要和迫切。本文对超宽带系统中的一些关键无源器件进行了研究,主要进行了以下几个方面的工作:首先,对应用于超宽带无线通信系统中的超宽带带通滤波器以及宽带天线的研究现状进行了简单的介绍,并且介绍了滤波器和天线的一些重要的性能参数。其次,提出了几个共面波导和微带混合结构的滤波器。通过引入交指耦合线和环形谐振器使得滤波器的选择性得到了极大的改善。此外,通过引入耦合T型短路枝节实现了带陷波的滤波器,在8.2GHz处的最大衰减达到了42dB。然后,提出和分析了一种新型的缺陷微带结构谐振器,并且基于该谐振器设计了一个超宽带带通滤波器。为了进一步改善滤波器的选择性,设计并加工了一个改进型的超宽带带通滤波器。测试结果表明,该滤波器的3 dB工作带宽达到了133%(2.3到11.5 GHz),并且在2.7到11.3 GHz内的回波损耗优于14 dB,中心频率附近的插入损耗小于0.4 dB。除此之外,在本文中还提出了几个紧凑型的超宽带滤波器。最后,设计了一种改进型的[豓ivaldi天线和两个新型的平衡[豓ivaldi天线。由于在天线孔径的中间处加入了一个复合金属贴片当作引向器,使得天线的增益和波束偏离得到了显著的改善。测试结果表明,文中提出的[豓ivaldi天线的增益在高于7 GHz时大于10 dBi,并且在17到30 GHz频率范围内大于15 dBi。提出的两个平衡[豓ivaldi天线同样具备良好的性能,比如不错的端射特性、低的交叉极化、紧凑的尺寸、相对高的增益以及极宽的工作带宽(2到40 GHz),使得其能够较好的用于相控阵、超宽带系统和RCS成像等。
[Abstract]:With the rapid development of wireless communication technology, especially microwave and millimeter-wave technology, the passive devices used in various communication systems are required more and more. Ultra-wideband (UWB) technology has attracted much attention because of its wide bandwidth, good security and high transmission rate. UWB bandpass filters and wideband antennas are indispensable devices in the whole UWB system, which determines the communication quality of the whole communication system. Therefore, the study of UWB passive devices (UWB filters, UWB antennas, etc.) is very important and urgent. In this paper, some key passive devices in UWB system are studied. The main works are as follows: first, The research status of UWB bandpass filters and wideband antennas used in UWB wireless communication systems is briefly introduced, and some important performance parameters of filters and antennas are also introduced. Secondly, several coplanar waveguide and microstrip filters are proposed. The filter selectivity is greatly improved by introducing interDigital coupling line and ring resonator. In addition, the filter with notch wave is realized by introducing the coupling T-type short circuit branch, and the maximum attenuation at 8.2GHz reaches 42 dB. Then, a novel defective microstrip resonator is proposed and analyzed, and an ultra-wideband bandpass filter based on the resonator is designed. In order to improve the selectivity of the filter, an improved UWB band-pass filter is designed and fabricated. The test results show that the bandwidth of the filter reaches 133dB from 2.3 to 11.5 GHz, and the return loss is better than 14 dB in the range of 2.7 to 11.3 GHz, and the insertion loss near the center frequency is less than 0.4 dB. In addition, several compact UWB filters are proposed in this paper. Finally, an improved [? Ivaldi Antenna and two New Equilibrium [? Ivaldi antenna. Due to the addition of a composite metal patch to the center of the antenna aperture, the gain and beam deviation of the antenna are greatly improved. The test results show that the proposed [? The gain of the ivaldi antenna is greater than 10dBiwhen it is higher than 7 GHz, and is larger than 15dBiin the frequency range of 17 to 30 GHz. Two proposed balances [? The ivaldi antenna also has good performance, such as good end-to-end characteristics, low cross-polarization, compact size, relatively high gain, and extremely wide operating bandwidth of 2 to 40 GHz, making it better for phased arrays. UWB system and RCS imaging.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN713;TN822

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