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Miniaturization of Parallel Coupled-Line Filter using Lumped Capacitors and Grounding  

Myoung Seong-Sik (연세대학교 전기전자공학과)
Yook Jong-Gwan (연세대학교 전기전자공학과)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.15, no.9, 2004 , pp. 888-895 More about this Journal
Abstract
This paper proposes new miniaturization method of parallel coupled line filter by using capacitors and grounding. Proposed method can reduce resonator size by using only a small number of capacitor and grounding of parallel coupled line filter which is conventional in field of RF filters because of its design and fabrication simplicity. This paper applies the miniaturization method of transmission line and parallel coupled line to parallel coupled line filter, and presents that grounding can reduce the number of shut capacitors. Presented miniaturized method has merits of miniaturization of parallel coupled line, harmonic suppression, and improvement of high frequency skirt with harmonic suppression. For verification of proposed method, this paper presents a hairpin filter, which has 900 MHz center frequency and 10 % FBW, miniaturized to λ/4 by proposed method.
Keywords
Miniaturization; Parallel Coupled-Line Filer; Capacitor; Grounding; Hairpin;
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