A UHF third order 5-bit digital tunable bandpass filter based on mixed coupled open ring resonators

作者：Fu Ming Ye; Xiang Qian Yin^*; Zhang Dan; Tian Deng Yao; Feng Quan Yuan

来源：Progress in Electromagnetics Research C, 2016, 64: 89-96.

DOI：10.2528/PIERC16032701

• Coupling coefficient
• Electric sources
• Fractional bandwidths
• Frequency selectivity
• Open-ring resonators
• Transmission zeros
• Tunable band-pass filters
• Tunable capacitors

This paper presents a third-order digital tunable bandpass filter based on digitally tunable capacitor loaded microstrip open ring resonator. Magnetic dominated mixed coupling is utilized to make the coupling coefficient meet the requirement of stable bandwidth response. Electric source-load coupling is designed to generate a transmission zero for improving the frequency selectivity. This filter is designed, fabricated and measured. The measurement shows that the filter can be digitally tuned by 5-bits pure digital command. The fractional bandwidth is 9 ±1%, and the tuning range is from 410MHz to 820 MHz.

• 出版日期2016
• 单位西南交通大学