摘要
对基于阶梯阻抗加载发卡型谐振器的多级椭圆函数微带滤波器进行了讨论。通过把两个谐振器用等效于电感的细微带线连接起来构成二级低通滤波器,其在阻带带宽和阻带衰减方面与单谐振器滤波器相比,取得了非常明显的改善。新设计滤波器的3dB截止频率位于2GHz,在2.5~25GHz具有小于10dB的衰减,而滤波器的面积仅等效于0.081λg×0.096λg（λg是在截止频率2GHz的导波波长）,证明了此种谐振器在多级滤波器设计中的有效性。此外,为更好地理解此种滤波器工作原理,文中对单谐振单元滤波器的LC等效电路进行了提取。与其它微带低通滤波器相比,此种滤波器在小型化、宽阻带方面具有明显优势,可广泛应用于多种微波系统。
Multisection elliptic-function microstrip lowpass filters（LPFs） using SIRs-loaded hairpin resonators are presented.By connecting two resonators with a narrow microstrip line,the two-cell filter has a very wide stopband which greatly improves attenuation compared with the one-cell filter.It has a 3dB cutoff frequency at 2GHz and has a 10dB stopband form 2.5 to 25GHz with a size amounts to only 0.081λg×0.096λg（λg is the guided wavelength cutoff frequency 2GHz.）.The validity of this type of resonator when used in multisection filters is also proved.In order to understand the characteristics of the new filter,the parameters of its equivalent LC circuit are extracted.The new filter has advantages of compact size and wide stopband over conventional microstrip filters,and it could be used in many microwave systems.
出处
《微波学报》
CSCD
北大核心
2010年第4期61-64,共4页
Journal of Microwaves
基金
国家自然科学基金项目(10775029)
关键词
微波滤波器
低通滤波器
阶梯阻抗谐振器
发卡型谐振器
Microwave filter
Lowpass filter（LPF）
Stepped Impedance Resonator（SIR）
Hairpin Resonator
