基于双同轴谐振器的紧凑型双通带滤波器

Compact Dual-band Bandpass Filter Based on Dual-coaxial Resonators

中文关键词:  双通带滤波器  双同轴谐振器  小型化  频率可控  带宽可控

英文关键词:dual-band bandpass filter  double coaxial resonator  compact size  controllable frequency  controllable bandwidth

中文摘要:

      文中提出了基于双同轴谐振器的紧凑型双通带带通滤波器。提出的双同轴谐振器由一个同轴谐振器嵌入另一个同轴谐振器组成,其中一个谐振器的金属谐振柱用作另一个谐振器的屏蔽腔,对比传统的单模同轴谐振器,在不增加尺寸的情况下形成双模谐振器。文中研究了双同轴谐振器的谐振频率以及谐振器之间的耦合系数控制方法,从而通过设计双同轴谐振腔间两个模式的激励和耦合方式,实现了具有通带频率和带宽独立可控的双通带滤波器。测试结果的中心频率为2. 73 GHz 和3. 19 GHz,插入损耗分别为0. 92 dB 和0. 75 dB,3 dB 相对带宽分别为5. 0%和3. 4%,两个通带中间产生了一个传输零点,实现了良好的双通带滤波响应。

英文摘要:

      A compact dual-band bandpass filter based on dual-coaxial resonators is proposed in this paper. The dual-coaxial resonator is constructed by embedding one coaxial resonator into the other one, where the conductive post of one coaxial resonator acts as the metallic shielding of the other resonator. Accordingly, a dual-mode resonator is obtained almost without increasing the size as compared to the conventional single-mode coaxial resonator. By investigating the control of resonant frequencies of the dualcoaxial resonator and the control of coupling coefficient between two resonators, separate control of the excitation of two resonant modes and the coupling coefficient between two resonators are achieved. Then, a dual-band bandpass filter with controllable passband frequencies and bandwidths is realized. The measured center frequencies are 2. 73 GHz and 3. 19 GHz, the insertion losses are 0. 92 dB and 0. 75 dB, and the 3 dB fractional bandwidths are 5. 0% and 3. 4%. A transmission zero is generated at the frequency between the two passbands, achieving a good dual-passband filtering response.