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摘要随着模块结构单元(Modular Building Block, MBB)的发展，对基站提出更高的高效、小型化、低成本等需求，不同应用场景里系统对滤波器都提出更高的要求。介质或腔体滤波器，在成本或群时延波动或体积等方面均不能完全满足需求，所以对新型的近端高抑制低插损的PCB滤波器提出了需求。
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根据谐振器的小型化技术，本文提出了微带低通滤波器高性能、小型化的设计方案，并利用这种方案设计出了三个高性能小型化的微带低通滤波器。最终通过仿真和实验验证了这三种滤波器的性能，并且分析了高阻抗线对滤波器性能的影响。仿真结果和测试结果基本吻合。
第一种滤波器3dB截止频率为1GHz，电路面积尺寸为18.2×14.9mm ，也可以等效为0.111λg×0.091λg，其中λg是频率为1GHz的波导波长，能够抑制制阻带内16次15dB以上的谐波信号。
第二种滤波器3dB截止频率为0.85GHz，电路面积尺寸为17×15.6mm ，也可以等效为0.089λg×0.081λg，其中λg是频率为0.85GHz的波导波长，能够抑制制阻带内14次15dB以上的谐波信号。
第三种滤波器3dB截止频率为0.8GHz，电路面积尺寸为11.6×15.7mm ，也可以等效为0.057λg×0.077λg，其中λg是频率为0.8GHz的波导波长，能够抑制制阻带内17次15dB以上的谐波信号。
毕业论文关键词 PCB滤波器 高性能 低插损 微带低通 小型化22306
毕业设计说明书（论文）外文摘要
Title New type of proximal high inhibition PCB filter
research and design of low insertion loss
Abstract
As the development of module structure unit (Modular Building Block, MBB), higher efficiency, miniaturization, and low cost are required for the base station. Different application environments in the systems present higher requirements for filters. Filters based on dielectrics or cavities, in such aspects, as the increase of costs and volume or variation of group delay cannot completely meet these demands. Therefore, new type of PCB filters with high suppression near the lower side of passband and low insertion loss are extremely required.
According to the technique of miniaturized resonator design, we proposed the design scheme of microstrip low-pass filters with high performance and compact size in this thesis. Based on this design scheme, we finally designed out three types of microstrip low-pass filters with high-performance and compact size.The performances of these three types of filters are verified by simulation and measurement. Furthermore, we also analyzed the effects of high impedance lines on filter performance. Simulation and measurement results basically agree well.
The first filter 3dB cutoff frequency is 1GHz.The proposed filter exhibits a small size of 18.2×14.9mm ,which can be equivalent to 0.111λg×0.091λg,where λg is the guided wavelength at 1 GHz． Furthermore，results indicate that the proposed filter is able to suppress the 16 times harmonic response referred to a suppression degree of 15 dB．
The second filter 3dB cutoff frequency is 0.85GHz.The proposed filter exhibits a small size of 17×15.6mm ,which can be equivalent to 0.089λg×0.081λg,where λg is the guided wavelength at 0.85 GHz． Furthermore，results indicate that the proposed filter is able to suppress the 14 times harmonic response referred to a suppression degree of 15 dB．
The third filter 3dB cutoff frequency is 0.8 GHz.The proposed filter exhibits a small size of 11.6×15.7mm ,which can be equivalent to 0.057λg×0.077λg,where λg is the guided wavelength at 0.8 GHz． Furthermore，results indicate that the proposed filter is able to suppress the 17 times harmonic response referred to a suppression degree of 15 dB．