求几篇IEEE论文: geometrical structures and fundamental characteristics of microwave steppped-imp.pdf

1.geometrical structures and fundamental characteristics of microwave steppped-impedance resonators
  Microwave Theory and Techniques, IEEE Transactions on (Volume:45 ,  Issue: 7 )
2.bandpass filters using parallel coupled stripline stepped impedance resonatros
  Microwave Theory and Techniques, IEEE Transactions on (Volume:28 ,  Issue: 12 )
3.microstrip bandpass filters with ultra-broad rejectionband using stepped impedance resontor and high-impedance transformer
  Microwave Symposium Digest, 2005 IEEE MTT-S International       Date of Conference: 12-17 June 2005
4.400MHz带阻式螺旋双工器的设计
5.基于新型微扰小环的微带双模带通滤波器
6.微带环形谐振腔双模带通滤波器的研究
7.多模微带滤波器的研究与设计
8. 微带矩形贴片双模带通滤波器的研究
      谢谢！