Study of Compact Low Losses Multi-Band Bandpass Filters Using Half Wavelength Stepped Impedance Resonator

• Main Authors: LU,YU-CHEN, 呂育臻
• Other Authors: WU, HUNG-WEI
• Format: Others
• Language: en_US
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/8j5aa2

碩士 === 崑山科技大學 === 電腦與通訊研究所 === 107 === This thesis mainly studies the development of planar multi-pass bandpass filters. The proposed filter with low insertion loss and good passband selectivity to provide a design bandpass filters with simplicity and flexibility. Two type of novel multi-band bandpass filter are presented in this study. The first type is compact quad-band bandpass filter (BPF) using stepped impedance resonators (SIRs). The filter is designed to have quad-band at 1.2, 2.4, 3.5 and 5.2 GHz. The four passbands are simultaneously generated by controlling the impedance and length ratios of the traditional and half wavelength stepped impedance resonators. The filter can provide the multi-path propagation to enhance the frequency response and achieving the compact circuit size. The second type is a compact quint-band bandpass filter (BPF) with multi transmission zero using stepped impedance resonators (SIRs). The five passbands are simultaneously generated by controlling the impedance ratios (K) and length ratios (α) of the stepped impedance resonators (SIRs). The filter can provide the three-path propagation to enhance the frequency response, generating multi transmission zeros and achieving the compact circuit size. The measured results have good agreement with the full-wave EM simulation results.