| Semi-Lumped Compact Low-Pass Filter for Harmonics Suppression |
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Rui Li, Dong-Il Kim, Chang-Mook Choi |
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Department of Radio Sciences and Engineering, Korea Maritime University |
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| Abstract |
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In this paper, a new semi-lumped low-pass filter with three finite attenuation poles at stopband is presented. The new structure is composed of a pair of symmetrical parallel coupled-line and a shunted capacitor. With this configuration, three finite attenuation poles can be available for 2nd, 3rd, and 4th harmonics suppression. The research method is based on transmission-line model for tuning the attenuation poles. In order to examine the feasibility of the proposed structure, a low-pass filter based on microstrip structure with harmonics suppression is designed, fabricated, and measured. The experimental results of the fabricated circuit agree well with the simulation and analytical ones. |
| Key words:
Finite Attenuation Poles, Harmonics Suppression, Low-Pass Filter, Parallel Coupled-Line |
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