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A compact semi-lumped low-pass filter for harmonics and spurious suppression

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1 Author(s)
Sheen, Jyh-Wen ; Comput. & Commun. Res. Labs., Ind. Technol. Res. Inst., Hsinchu, Taiwan

A semi-lumped parallel resonance circuit was employed to design a very compact low-pass filter. The semi-lumped shunt arm consists of a capacitor and a transmission line section. In such an arrangement, two finite attenuation poles can be generated near the passband edge. As a result, the proposed filter enjoys sharper cutoff and fewer filter orders than those of the conventional low-pass filters. In addition, these two attenuation poles can be properly designed to suppress the second and third harmonics generated from power amplifier and frequency source. A low-temperature cofired-ceramic (LTCC) multilayer-ceramic (MLC) low-pass filter and a PCB low-pass filter with a 0402 chip capacitor were designed and tested. Experimental results demonstrate the capability of this filter in harmonics and spurious suppression

Published in:

Microwave and Guided Wave Letters, IEEE  (Volume:10 ,  Issue: 3 )

Date of Publication:

Mar 2000

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