Substrate integrated waveguide filters with face-to-face broadside-coupled complementary split ring resonators

Novel substrate integrated waveguide (SIW) filters using face-to-face oriented broadside-coupled complementary split ring resonators (BC-CSRRs) are presented in this paper. The SIW with the conventional BC-CSRR resonator pairs is first investigated. By removing the metal strip between the two back-to-back rings of the BC-CSRR pair, a modified BC-CSRR pair which shows a significantly improved spurious suppression and a wider rejection bandwidth is then proposed. SIW bandpass filters based on the resonator pairs have been designed, fabricated and measured. The SIW filter with modified BC-CSRR pairs exhibits a great improvement in the stopband performance. The proposed filters work below the cutoff frequency of the main mode of the SIW. They have the usual advantages of the SIW and the BC-CSRR such as compact size, easy fabrication and easy integration with other electronic circuits.

[1]  Ian D. Robertson,et al.  Novel substrate integrated waveguide bandpass filter with broadside-coupled complementary split ring resonators , 2012, 2012 IEEE/MTT-S International Microwave Symposium Digest.

[2]  Jun Xu,et al.  Novel Band-Pass Substrate Integrated Waveguide (SIW) Filter Based on Complementary Split Ring Resonators (CSRRs) , 2007 .

[3]  F. Martín,et al.  Effective negative-/spl epsiv/ stopband microstrip lines based on complementary split ring resonators , 2004, IEEE Microwave and Wireless Components Letters.

[4]  Francisco Medina,et al.  Role of bianisotropy in negative permeability and left-handed metamaterials , 2002 .

[5]  S. He.  EVANESCENT-MODE SUBSTRATE INTEGRATED WA- VEGUIDE (SIW) FILTERS IMPLEMENTED WITH COM- PLEMENTARY SPLIT RING RESONATORS , 2011 .

[6]  Ke Wu,et al.  Single-substrate integration technique of planar circuits and waveguide filters , 2003 .

[7]  J. Pendry,et al.  Magnetism from conductors and enhanced nonlinear phenomena , 1999 .

[8]  Chao Li,et al.  A compact planar bandpass filter with wide out‐of‐band rejection implemented by substrate‐integrated waveguide and complementary split‐ring resonator , 2011 .

[9]  Jia-Sheng Hong,et al.  Microstrip filters for RF/microwave applications , 2001 .

[10]  Kaiyu Liu,et al.  Design of microstrip highpass filters with complementary split ring resonators , 2007 .

[11]  Tao Yang,et al.  Substrate Integrated Waveguide Loaded by Complementary Split-Ring Resonators and Its Applications to Miniaturized Waveguide Filters , 2009, IEEE Transactions on Microwave Theory and Techniques.