双频段平面天线与滤波器的协同设计
发布时间：2018-11-02 18:00
【摘要】：在现代化无线通信系统中,无线通信设备终端已逐步演变成为个人化的智能设备,因此其中的射频前端需要具备多功能且高性能的特点。作为射频前端的关键部件,滤波器与天线已经成为研究的热点,向着损耗小、小型化、成本低、多频段方向发展。一般的设计中,滤波器和天线是分别独立设计的,并使其端口具有相同特性阻抗,然后直接连接。直接连接经常会引起阻抗失配,使射频前端的性能恶化,尤其是滤波器通带边缘,还会增加电路的插入损耗。为了避免阻抗失配,必须在两元件间加入额外的匹配网络,这样会加大电路尺寸,不利于小型化。随着电路集成度不断提高,为了实现小型化,希望能够将天线跟与其相邻的滤波器集成到一个模块中。为此,本文首先提出了一种新的小型化双频段滤波器设计方法,为了验证其有效性,设计了一种应用于WLAN的双频段滤波器,进而提出了一种双频天线与滤波器协同设计的方法。本论文的内容主要分以下几部分：一、介绍了应用于射频通信系统中滤波器与天线的研究现状,然后介绍了表征其响应特性的几个相关参数。二、提出了一种新的小型化双频滤波器的设计方法,为了验证该方法可行,本文设计了一种基于阶跃阻抗谐振器(SIR)结构的双频滤波器,该滤波器工作于2.4GHz和5.2 GHz,反射系数都低于-20 dB,插入损耗小于1 dB,相对带宽FBW均为20%,尺寸为6mm x 15 mm (0.08 λg1 x 0.19 λg1 λg1为第一通带中心频率的导波波长)。三、进行了双频天线与滤波器的协同设计,即根据阻抗匹配原则对双频滤波器和天线同时进行独立设计,然后应用本文提出的方法对其协同。即先将天线当做滤波器负载,可将其作为影响滤波器响应特性的关键参数之一,然后通过综合考虑这几个关键参数实现其性能指标,完成天线与滤波器的协同设计。为验证该方法的可行性,进行了基于阶跃阻抗谐振器(SIR)结构的双频滤波器与双频单极子天线的协同设计,工作于2.4 GHz和5.2 GHz,反射系数都低于-16 dB,相对带宽FBW分别为10%,8%,尺寸为35 mm x 20 mm (0.44 λg1 x 0.25 λg1,λg1为第一通带中心频率的导波波长)。
[Abstract]:In modern wireless communication system, the terminal of wireless communication equipment has gradually evolved into a personalized intelligent device, so the RF front-end needs to have the characteristics of multi-function and high performance. As a key component of RF front-end, filters and antennas have become a hot research topic, and have been developed towards low loss, miniaturization, low cost and multi-frequency band. In a general design, filters and antennas are designed independently, with the same characteristic impedance on their ports, and then connected directly. Direct connection often leads to impedance mismatch, which makes the performance of RF front end deteriorate, especially the filter passband edge, and increases the insertion loss of the circuit. In order to avoid impedance mismatch, an extra matching network must be added between the two components, which will increase the circuit size and is not conducive to miniaturization. With the increasing integration of circuits, in order to realize miniaturization, it is hoped that the antenna and the adjacent filter can be integrated into one module. In this paper, a new miniaturized dual-band filter design method is proposed in this paper. In order to verify its validity, a dual-band filter applied to WLAN is designed, and a cooperative design method of dual-band antenna and filter is proposed. The main contents of this thesis are as follows: firstly, the research status of filter and antenna used in RF communication system is introduced, and then some related parameters to characterize their response characteristics are introduced. Secondly, a new design method of miniaturized dual-frequency filter is proposed. In order to verify the feasibility of the method, a dual-frequency filter based on step impedance resonator (SIR) structure is designed. The filter works on 2.4GHz and 5.2 GHz,. The reflection coefficients are lower than -20 dB, and the insertion loss is less than 1 dB,. The relative bandwidth FBW is 20. The dimension is 6mm x 15 mm (0.08 位 g 1 x 0.19 位 g 1 位 g 1 is the guiding wave wavelength of the center frequency of the first pass band). Thirdly, the cooperative design of dual-frequency antenna and filter is carried out, that is, according to the principle of impedance matching, the dual-frequency filter and antenna are designed independently at the same time, and then the method proposed in this paper is applied to the cooperation. That is to say, the antenna is regarded as the filter load, which can be regarded as one of the key parameters that affect the response characteristics of the filter. Then, the performance index of the antenna and the filter is realized by considering these key parameters synthetically, and the cooperative design of the antenna and filter is completed. To verify the feasibility of this method, a cooperative design of dual-frequency filter and dual-frequency monopole antenna based on step impedance resonator (SIR) structure is carried out. The reflection coefficients of 2.4 GHz and 5.2 GHz, are lower than -16 dB,. The relative bandwidth FBW is 10 and 8, the dimension is 35 mm x 20 mm (0.44 位 g 1 x 0.25 位 g 1, 位 g 1 is the guided wave wavelength of the center frequency of the first pass band).
【学位授予单位】：山西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN823.27;TN713
本文编号：2306534
[Abstract]:In modern wireless communication system, the terminal of wireless communication equipment has gradually evolved into a personalized intelligent device, so the RF front-end needs to have the characteristics of multi-function and high performance. As a key component of RF front-end, filters and antennas have become a hot research topic, and have been developed towards low loss, miniaturization, low cost and multi-frequency band. In a general design, filters and antennas are designed independently, with the same characteristic impedance on their ports, and then connected directly. Direct connection often leads to impedance mismatch, which makes the performance of RF front end deteriorate, especially the filter passband edge, and increases the insertion loss of the circuit. In order to avoid impedance mismatch, an extra matching network must be added between the two components, which will increase the circuit size and is not conducive to miniaturization. With the increasing integration of circuits, in order to realize miniaturization, it is hoped that the antenna and the adjacent filter can be integrated into one module. In this paper, a new miniaturized dual-band filter design method is proposed in this paper. In order to verify its validity, a dual-band filter applied to WLAN is designed, and a cooperative design method of dual-band antenna and filter is proposed. The main contents of this thesis are as follows: firstly, the research status of filter and antenna used in RF communication system is introduced, and then some related parameters to characterize their response characteristics are introduced. Secondly, a new design method of miniaturized dual-frequency filter is proposed. In order to verify the feasibility of the method, a dual-frequency filter based on step impedance resonator (SIR) structure is designed. The filter works on 2.4GHz and 5.2 GHz,. The reflection coefficients are lower than -20 dB, and the insertion loss is less than 1 dB,. The relative bandwidth FBW is 20. The dimension is 6mm x 15 mm (0.08 位 g 1 x 0.19 位 g 1 位 g 1 is the guiding wave wavelength of the center frequency of the first pass band). Thirdly, the cooperative design of dual-frequency antenna and filter is carried out, that is, according to the principle of impedance matching, the dual-frequency filter and antenna are designed independently at the same time, and then the method proposed in this paper is applied to the cooperation. That is to say, the antenna is regarded as the filter load, which can be regarded as one of the key parameters that affect the response characteristics of the filter. Then, the performance index of the antenna and the filter is realized by considering these key parameters synthetically, and the cooperative design of the antenna and filter is completed. To verify the feasibility of this method, a cooperative design of dual-frequency filter and dual-frequency monopole antenna based on step impedance resonator (SIR) structure is carried out. The reflection coefficients of 2.4 GHz and 5.2 GHz, are lower than -16 dB,. The relative bandwidth FBW is 10 and 8, the dimension is 35 mm x 20 mm (0.44 位 g 1 x 0.25 位 g 1, 位 g 1 is the guided wave wavelength of the center frequency of the first pass band).
【学位授予单位】：山西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN823.27;TN713
【参考文献】
相关博士学位论文 前1条
1 位朝垒;新型微波滤波器关键技术研究[D];电子科技大学;2013年
相关硕士学位论文 前2条
1 底浩;基于频率变换法的多通带微波滤波器综合方法研究[D];西安电子科技大学;2010年
2 刘建华;宽带天线与滤波天线研究与设计[D];南京航空航天大学;2012年
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