UNIPLANAR TUNABLE BANDPASS FILTER USING CENTRALLY-LOADED SLOT-LINE RESONATOR

作者：Chen, Jian-Xin; Bao, Zhi-Hua^*; Xu, Chen; Zhang, Guo-An

来源：Microwave and Optical Technology Letters, 2010, 52(12): 2805-2807.

DOI：10.1002/mop.25617

• tunable bandpass filter (BPF)
• short-ended resonator
• centrally loaded slot-line resonator

A novel uniplanar tunable bandpass filter (BPF) is designed by using the centrally loaded slot-line resonator. From the voltage-ware distribution along the resonator, the proper location for the loading element is determined to be the center of the slot-line resonator, where the voltages of the fundamental signal and second harmonic are maximum and zero. respectively. As a result, the fundamental frequency can be tuned, whereas the second harmonic remains almost unchanged. For the first time, the properties of the centrally loaded slot-line resonator are analyzed by using the even- and odd-mode method, and their respective resonant frequencies are derived. The demonstrated tunable BPF can give >30% frequency tuning range with acceptable insertion loss when a varactor is used as the loading element.

• 出版日期2010-12
• 单位南通大学