移动通信宽带及双频带定向耦合器的研究与设计

发布时间：2018-01-08 16:19

本文关键词：移动通信宽带及双频带定向耦合器的研究与设计　出处：《南京邮电大学》2015年硕士论文　论文类型：学位论文

【摘要】：定向耦合器作为通信系统中的核心器件,一直以来都是微波器件中研究的重点和热点。而随着近年来移动通信和无线通信的迅速发展,尤其是TD-LTE商用牌照及FDD-LTE试验牌照的相继发放,中国正式全面进入4G(第四代)移动通信时代以来,对宽带及多频化定向耦合器的研究和设计变得更加迫切。基于以上背景,本文首先通过在传统分支线定向耦合器中引入改进型的匹配网络以达到拓宽定向耦合器频带的目的,在此基础上又在耦合器的金属接地面上加入缺陷地结构(DGS)进一步提高了定向耦合器的带宽和性能,从而设计出宽带分支线定向耦合器。鉴于未来无线通信设备的多频化趋势,本文在充分研究开路枝节以及左手材料特性的基础上,分别在传统宽边耦合定向耦合器中加载开路枝节和简化复合左右手结构,实现了宽边耦合定向耦合器的双频特性。所设计的定向耦合器的耦合度和隔离度等指标达到要求,带宽基本覆盖国内GSM、3G及4G移动通信的频段。本文对宽频带及双频带定向耦合器进行了深入分析和研究,设计出的宽频带分支线定向耦合器和双频带宽边耦合定向耦合器的性能良好,能运用到国内移动通信和无线通信系统中,文中对宽频带及双频带定向耦合器的分析方法和设计过程可以用于其它宽频带及多频带定向耦合器的设计中。
[Abstract]:As the core device of communication system, directional coupler has always been the focus and hotspot of microwave devices. However, with the rapid development of mobile communication and wireless communication in recent years. Especially with the issuance of TD-LTE commercial license and FDD-LTE test license, China has entered the era of 4G (4th generation) mobile communication. The research and design of wideband and multi-frequency directional couplers have become more urgent. In this paper, an improved matching network is introduced into the traditional branch line directional coupler to widen the frequency band of the directional coupler. On this basis, the defect ground structure (DGSs) is added to the metal connection ground of the coupler to further improve the bandwidth and performance of the directional coupler. The broadband branch line directional coupler is designed. In view of the multi-frequency trend of wireless communication equipment in the future, this paper fully studies the characteristics of open-circuit branch and left-handed material. In the traditional wideband coupled directional coupler, the open branch is loaded and the composite left-right hand structure is simplified. The dual-frequency characteristics of the wideband coupled directional coupler are realized. The coupling degree and isolation degree of the designed directional coupler meet the requirements and the bandwidth basically covers the domestic GSM. The broadband and dual-band directional couplers for 3G and 4G mobile communications are analyzed and studied in this paper. The designed broadband branch line directional coupler and dual-band side-coupled directional coupler have good performance and can be used in domestic mobile communication and wireless communication systems. The analysis method and design process of broadband and dual-band directional couplers can be used in the design of other broadband and multi-band directional couplers.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN622;TN929.5

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