Design of Compact Multi-Passband Bandpass Filter Based on New Multi-Mode Resonators

• Main Authors: Yu-Chian Jiang, 江俞蒨
• Other Authors: Hung-Wei Wu
• Format: Others
• Language: en_US
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/7fawzq

碩士 === 崑山科技大學 === 電腦與通訊研究所 === 107 === The filter is designed to have triple-passband at 1.8, 2.4 and 3.5 GHz. The 1.8 and 2.4 GHz are generated by controlling the impedance and length of the asymmetric stub-loaded uniform impedance resonators (UIRs) and 3.5 GHz is generated by shorted uniform impedance resonator (UIR). By using the asymmetric stub-loaded UIRs, the filter with closed passbands and frequency response of wide stopband having around -30 dB stopband from 3.7 to 12 GHz. The second part is to use a multi-mode resonator to generate five passband, the multi-mode stub loaded resonators is designed to have tree resonant paths at 1.5, 2.4, 3.5, 4.5 and 5.8 GHz. Extra a uniform impedance resonator to compensate for 2.4 GHz of energy loss. The filter has advantages of compact circuit size, high passband selectivity and low insertion loss.