Novel methodologies for miniaturized filter design and realization
Date of Issue2007
School of Electrical and Electronic Engineering
Tremendous growth in wireless communications has resulted in increasingly crowded frequency spectrum. As a result, a large number of passive components, such as high selectivity RF/microwave resonators and filters as well as baluns, are in demand in practical applications. Beside the performance, their compact size and low cost become very important of these passive components for the compact and portable communication systems. This thesis is therefore devoted to developing novel design methodologies for miniaturized resonators, filters and baluns with good performance. These designs are implemented and verified by using several fabrication technologies including print circuit board (PCB), thin-film, silicon micromachining and CMOS. Firstly, a novel general coupling method based on the investigation of the EM coupling paths is proposed. Secondly, the conductor-backed coplanar waveguide (CBCPW) slow-wave transmission lines and filters with gradual transition periodic loading are investigated extensively. Finally, through investigating the electromagnetic characteristic of spirals on low resistivity silicon (resistivity of ~15O·cm), novel baluns have been proposed and implemented using commercial CMOS process. This work leads to the smallest balun in the world to cover the frequency range of 850MHz~2.5GHz.
DRNTU::Engineering::Electrical and electronic engineering::Electronic circuits
Nanyang Technological University