摘要作为微波滤波器的重要形式之一,近年来微带线滤波器得到了广泛的应用。微带滤波器采用印制电路的方法,把微带印刷在很薄的介质基片上,以实现滤波器的功能,其具有尺寸小、成本低、易于集成等优点,在微波系统的设计中有着良好的应用前景。因此,对微带线滤波器的研究,具有重要的实际意义。
本文详细介绍了平行耦合微带结构的带通滤波器的设计方法。文中给出的设计方案主要是基于滤波器设计的经典方法——综合法进行设计的。该方案在理论设计的基础上,结合计算机软件ADS对理论设计结果进行仿真与优化,克服了理论分析精度低的缺点,从而缩短了设计与调试周期,节约了人力物力。本课题设计的滤波器中心频率为12.5GHz,通带频率范围为12.25GHz至12.75GHz,在通带内的衰减均控制在了2dB以内,通带内波纹小于0.5dB。带外衰减在10.35GHz处为41.7dB,大于40dB。经由ADS版图仿真验证,该滤波器的性能达到设计指标的要求。最后,对本文所做工作进行了总结,并提出存在的问题和下一步的工作展望。10207
关键词 带通滤波器 平行耦合微带线 ADS软件
毕业设计说明书(论文)外文摘要
Title Design of Ku Band Microstrip Bandpass Filter
Abstract
As an important form of microwave filter,microstrip filter has been widely used in recent years. The realization of microstrip filter is based on the printed circuit technology.According to a certain layout, printing microstrip on a thin dielectric substrate ,we can achieve the function of filter. Since its small size, low cost ,and integrated easily, microstrip filter has a good application prospects in the design of microwave systems. Therefore, the study of the microstrip filter has important practical significance.
The subject of this article is a step-by-step design procedure for parallel coupled microstrip bandpass filter. This design is on the basis of theoretical analysis,combined with software ADS to simulate and optimize of the theoretical results,and it overcomes the disadvantage of low accuracy of the theoretical analysis. The center frequency of this filter is 12.5GHz, the pass-band frequency ranges from 12.25GHz to 12.75GHz, the attenuation in the pass-band are controlled at less than 2dB, and the pass-band ripple is less than 0.5dB.Stop-band attenuation greater than 40dB at 10.35GHz at 41.7dB.ADS Momentum simulation results show
that the performance of the filter meets the design specification
requirements.
Keywords Bandpass Filter Parallel Couple ADS
目 次
1 绪论 3
1.1研究背景及意义 3
1.2国内外的研究现状 3
1.3微波仿真软件简介 4
1.4本文的主要工作与意义 5
2 微带线理论 6
2.1 微带传输线的结构 6
2.2 耦合微带线 7
2.3 微带谐振器 8
2.4二端口网络理论 10
3 滤波器设计方法 12
3.1 滤波器的分类 12
3.2 滤波器的设计指标 12
3.3滤波器的经典设计方法——综合法 13
3.3.1低通原型滤波器 14
3.3.2低通原形与带通滤波器的频率变换 17
3.3.3 倒置变换器与变形低通原型 19
3.3.4从变形低通到微带带通滤波器的变换过程 21
3.3.5使用平行耦合线实现带通滤波器 23 Ku波段微带带通滤波器设计+ADS仿真:http://www.751com.cn/tongxin/lunwen_9199.html