Design of Compact Microstrip Multi-band Bandpass Filters

• Main Authors: Sheng-Fa Chang, 張勝發
• Other Authors: Chi-Feng Chen
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/05971678203718258120

碩士 === 東海大學 === 電機工程學系 === 103 === This paper proposes a type of design method that enables the realization of a multi-band miniature bandpass filter, primary using resonators with different characteristic to design dual-band, triple-band, and hepta-band miniature bandpass filters respectively. For verification, this paper uses stepped impedance resonators, bimodal resonators, and quad-mode resonators to achieve the miniaturized and multi-band functionalities. It also uses source-load coupling to create transmission zeroes, thereby attaining high selectivity. This design method not only significantly decreases the volume of resonators originally required, but it also increased the volume of operated bands. Microstrip structures were used to achieve all designed circuits, in which the circuit areas of the dual-band, triple-band, and hepta-band bandpass filters were 0.05 λg × 0.09 λg，0.12 λg × 0.13 λg， and 0.15 λg × 0.2 λg respectively. The final simulation and measurement results showed good consistency, thereby verifying this paper’s design concept.