微带结构低通滤波器设计.doc
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1、普通本科毕业设计题 目:微带结构低通滤波器设计学 院 软件与通信工程学院 学生姓名 学 号 专 业 届 别 指导教师 职 称 副教授 二一六 年 七 月普通本科生毕业论文(设计)诚信承诺书毕业论文(设计)题 目学生姓名专业通信工程学 号指导老师 职 称副教授所在学院软件与通信工程学院诚信承诺本人慎重承诺和声明:我承诺在毕业论文(设计)活动中遵守学校有关规定,恪守学术规范,在本人的毕业论文中未剽窃、抄袭他人的学术观点、思想和成果,未篡改研究数据,如有违规行为发生,我愿承担一切责任,接受学校的处理。学生(签名): 年 月 日 江西财经大学普通本科设计1江西财经大学普通本科毕业设计摘 要随着雷达和无
2、线通信等无线电技术的飞速发展,研制低成本、高性能和小型化的微波电路已经成为了一项及其紧迫的任务。在微波通信、卫星通信、雷达导航等系统中,滤波器是重要的器件之一,它的性能好坏往往会对整个通信系统的性能指标产生直接的影响。工程设计和市场竞争的趋势要求电路一方面要满足电气性能指标,另一方面还要尽可能地减少电路所占用的空间。目前,在射频/微波电路中较常选用的是微带线结构的微波滤波器。这种结构的滤波器重量轻、通过光刻技术容易加工且方便与其他微波电路集成在一起,故许多通信系统均使用此类滤波器。但是,根据传统方法设计出来的微带结构滤波器的尺寸一般比较大,而且在性能上也存在着一定局限,往往无法满足现在无线通信
3、系统的要求。为了提高微带结构滤波器的性能,本论文重点研究微带线结构低通滤波器的设计与实现。主要从低通滤波器理想电路设计和微带结构低通滤波器设计两方面进行分析研究。在理想电路设计方面,采用了电容式和电感式两种设计方案。通过对理想电路的仿真结果比较,选择效果更加理想的电容式作为设计方案。在微带结构设计方面采用了阶梯阻抗线形式和开路线形式的设计方法,通过运用sonnet仿真比较,发现在带内特性方面,开路线形式优于阶梯阻抗线形式,但是开路线在截止频率方面的表现略劣于阶梯阻抗线。另外,二种设计思路都有一个共同的缺点带外衰减太慢。鉴于此,本论文最后提出具有传输零点的低通滤波器的设计方案,以此来解决带外衰减
4、慢的问题,同时达到展宽阻带的作用。【关键词】低通滤波器 微带结构 微波 阶梯阻抗 江西财经大学普通本科毕业设计AbstractWith the rapid development of radio technologies such as radar and wireless communication, it is very necessary to design miniaturized microwave circuits with good performances and low cost. In the systems of satellite communications, ra
5、dar and navigation, microwave filter is one of the key components whose performance directly impact on the behavior of the whole communication system. Under the trend of engineering design and market competition, it is required for the circuits to meet the electrical performance targets and minimize
6、 the space occupied by the circuit. At present, microstip structure is often used to design filters in RF/microwave circuits. Filters using microstip structure have good characteristics of small size, light weight, and can be easily produced by lithography and integrated with other microwave circuit
7、s. Therefore, many communication systems select this kind of filter. However, the size of filter designed by traditional methods is usually relatively large and there are certain limitations of performance indicators, which thereby can not meet the requirement of wireless communication systems.In or
8、der to improve the performance of microstrip filter, this paper focuses on the study of the design and realization of microstrip low-pass filter. Ideal low-pass circuit design and microstrip low-pass filter design are two parts of this research. In the part of ideal circuit design, capacitive and in
9、ductive design proposals are employed. By comparing the simulated results, the capacitive design proposal is adopted due to its better characteristics. In the part of microstrip low-pass filter design, step-impedance and open-circuit structures are used. By using the electromagnetic simulator sonnet
10、 to compare the response results, it can be seen that open-circuit structure is better than step-impedance structure in the passband of the filter, but open-circuit structure is worse than step-impedance structure for the performance of cutoff frequency. In addition, very slow attenuation in the sto
11、pband is a common drawback for both structures. In view of this, this paper presents a novel low-pass filter design scheme with transmission zeros to solve the problem of slow attenuation, and to enlarge the bandwidth of stopband.【Key words】 Low-pass filter; Microstrip structure; Microwave; Step-imp
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- 微带 结构 滤波器 设计
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