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A Compact Coupling Controllable Elliptical Filter Based on Multilayer LTCC
Author(s) -
Meng, Fanyi,
Ma Kaixue,
Yeo Kiat Seng,
Boon Chirn Chye,
Xu, Shanshan,
Lim Wei Meng,
Do Manh Anh
Publication year - 2013
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.27679
Subject(s) - resonator , band pass filter , stopband , microwave , fractional bandwidth , coupling (piping) , topology (electrical circuits) , bandwidth (computing) , materials science , coupling coefficient of resonators , filter (signal processing) , prototype filter , optoelectronics , electronic engineering , acoustics , engineering , electrical engineering , physics , telecommunications , filter design , composite material
This paper presents a compact elliptical filter based on modified λ/4 resonators with separated electric and magnetic coupling paths. For the proposed second‐order filters, transmission zero points are generated at either lower or upper stopband by controlling the relative coupling strength in the two paths of inter‐stage resonators. Based on the topology and multilayer LTCC technology, a fourth‐order bandpass filters operating at 5.2 GHz with a fractional bandwidth of 10% in 1.7 mm × 3 mm (0.0785λg × 0.1385λg) is designed and verified experimentally. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1789–1792, 2013