Switchable and Tunable Dual-Band Filter

• Main Authors: Hu, Chiao-Yi, 胡巧宜
• Other Authors: Chang, Chi-Yang
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/548yrr

碩士 === 國立交通大學 === 電信工程研究所 === 105 === In this study, a switchable and tunable dual-band filter is proposed. Combining switches and tunable filters, the circuit can operate in three different modes (off / single-band / dual-band) by changing the bias of varactors embedded in the structure. The design of tunable filter is based on second-order type I Chebyshev filters and vatactors which can be considered as voltage-controlled capacitors. The structure of dual-band filter is formed by connecting two filters in parallel with 50-ohm lines. The circuit in this study is fabricated with microstrip line on a RO4003C substrate with thickness of 20 mil and dielectric constant of 3.55.