摘要
提出一种新型的、中心频率可独立调谐的双频带通滤波器(bandpass filter,BPF).该滤波器由加载双端短路枝节的阶梯阻抗谐振器(stepped-impedance resonator,SIR)和双模开口环谐振器构成.二者共用输入输出耦合线,产生额外的传输零点,提高了滤波器的选择性.通过奇偶模的分析方法,在谐振器末端加载变容二极管,以调节奇偶模谐振频率来达到电调的效果.结果显示,第一通带的可调范围为1.93~2.20 GHz,第二通带的可调范围为2.78~3.10 GHz.比较仿真与测试结果,证明了该方法的有效性.
A dual bandpass filter (BPF) with two center frequencies tuned asynchronously and independently is presented. The proposed filter consists of a stepped-impedance resonator (SIR) with two-terminal shorted stubs and a dual-mode open-loop resonator. To generate additional transmission zeros and improve frequency selectivity, the common input and output coupling lines are used for these two structures. Using the odd-even mode analysis method, resonant frequencies of odd-even mode are electrically tuned due to the loaded vaxactors at the end of transmission line. The measured performance shows that the first passband can be tuned in a frequency range of 1.93-2.20 GHz, whereas the second passband varies from 2.78 to 3.10 GHz. Comparisons of simulated and measured results show effectiveness of the method.
出处
《上海大学学报(自然科学版)》
CAS
CSCD
北大核心
2015年第2期213-219,共7页
Journal of Shanghai University:Natural Science Edition
基金
上海市重点学科建设资助项目(S30108)
上海市科委重点实验室建设资助项目(08DZ2231100)
关键词
双频
带通滤波器
电调
奇偶模
dual-band
bandpass filter (BPF)
electronically tuned
odd-even mode