基于隐性多模耦合元件及电路互嵌法的微波多通带滤波器研究

项目名称： 基于隐性多模耦合元件及电路互嵌法的微波多通带滤波器研究

项目编号： No.61201047

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 电子学与信息系统

项目作者： 刘云

作者单位： 南京航空航天大学

项目金额： 27万元

中文摘要： 随着无线通信和应用的发展，能够多频复用的射频前端成为重要发展趋势，而多通带滤波器是其中的关键器件。以往使用多滤波器组合或多模谐振器级联方案实现多通带，前者电路效率低,后者受限于耦合网络，难于控制各带宽。本项目针对多模谐振器方案提出隐性多模耦合元件，由连接传输线和多模电容级联而成，后者隐入多模谐振器电路，导致谐振参量的修正；基于阶梯阻抗短截线（直接加载和电容加载）分别综合出四频以下带宽可控的多通带和多阻带滤波器；通过带通/带阻滤波器电路互嵌将多个通带分割，获得五到八频多通带滤波器。隐性多模耦合元件不限模数，通过多模谐振器的谐振参量可自由调控各带宽，突破了以往耦合网络对通带数量的限制；也因为电路简单，方便了多个谐振器的级联，突破了滤波器的阶数限制；电路互嵌法以集约化方式实现了通带数量倍增，并可进一步调控各带宽。通带间因存在多个传输零点而产生高隔离。本项目对多制式无线系统的研制具有重要应用意义。

中文关键词： 隐性多模耦合元件；J变换器；多频滤波器；电路互嵌；多频阻抗变换器

英文摘要： As mobile communication and other wireless applications are developing, multi-band RF-frontends are becoming an important trend while multi-band filters are key conponents to costruct these systems. In the literature two kinds of solutions are presented. The first type combines several filters to realize multiple passbands while the second cascades several multi-mode resonators to achieve several passbands.The former has shortcoming of low circuit efficiency, thus resulting in big dimension, while the latter has difficulty in assigning bandwidths due to lacking of perfect multi-mode coupling schemes. This project firstly presents recessive multi-mode coupling element which is a cascading of connecting transmission line and two multi-mode capacitors.The multi-mode capacitors are incorporated into the circuit of multi-mode resonators, incuring the updation of resonating parameters.By adopting stepped-impedance stubs as multi-mode resonators we present synthesis methods for multi-passband filters and multi-stopband filters with up to 4 bands for each. Then a circuit-embedding technique is adopted that the passbands of a multi-passband filter are split by the stopbands of a multi-stopband filter, resulting in 5 to 8 passbands. The presented recessive multi-coupling scheme has no limit for the number of modes and t

英文关键词： recessive multi-mode coupling elements；J inverter；multi-band filter；circuit embedding；multi-frequency impedance transformer