A Design of Tunable Band Pass Filter using Varactor Diode
Jung-Hyen Ha, Eunyoung Shin, Min-Woo Kang, Chilhyeun Gwon, Byung Hoon Park, Jong‐Sik Lim, Heung-Taek Choi, Dal Ahn · Journal of the Korea Academia-Industrial cooperation Society · 2009
This paper proposed a tunable band pass filter. It is two-poles direct capacitive coupled resonator band pass filter which the capacitors of parallel resonators are changed by varactor diodes. The DC bias controls to change the value of capacitance in the parallel resonator for tunning the pass band. To validate the proposed design method, we fabricated the band pass filter which has tunable center frequency from 200MHz to 245MHz.