A compact coupling controllable elliptical filter based on multilayer LTCC

• Main Authors: Meng, Fanyi, Ma, Kaixue, Yeo, Kiat Seng, Boon, Chirn Chye, Xu, Shanshan, Lim, Wei Meng, Do, Manh Anh
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2013
• Subjects: DRNTU::Engineering::Electrical and electronic engineering
• Online Access: https://hdl.handle.net/10356/106692; http://hdl.handle.net/10220/16636; http://dx.doi.org/10.1002/mop.27679
• Institution: Nanyang Technological University

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.