Defected ground structure band-stop filter by semicomplementary split ring resonators

This study proposes a band-stop filter using a defected ground structure. The notch frequency is produced by an array of two semicomplementary split ring resonators (SCSRRs), etched on the ground plane and two line resonators etched out of the microstrip line. Band reject behaviour is exhibited due to the presence of a negative effective dielectric permittivity near the resonance frequency. The filter produces high rejection with sharp cutoffs in the stop band, and shows a completely flat and lossless passband. In addition, because of the geometrical structure of the resonators and the filter, even harmonics responses of the filter are eliminated. The proposed filter is constructed on a substrate with a thickness of 0.8128 mm, e r of 3.55 and dimensions of 30 × 45 mm 2 . Measurements show an insertion loss below 30 dB from 2.3 to 2.7 GHz and a maximum insertion loss of 44 dB at around 2.53 GHz. The electrical size of the filter is small due to the sublambda operation of SCSRRs and is verified in the last section by comparing the proposed filter with other familiar metamaterials such as complementary split ring resonator. Moreover, the distributed equivalent circuit model based on geometrical filter parameters is introduced.

[1]  K. Gupta,et al.  Microstrip Lines and Slotlines , 1979 .

[2]  Ai Qun Liu,et al.  CPW band-stop filter using unloaded and loaded EBG structures , 2005 .

[3]  Willie J Padilla,et al.  Composite medium with simultaneously negative permeability and permittivity , 2000, Physical review letters.

[4]  Zhirun Hu,et al.  Negative permittivity meta-material microstrip binomial low-pass filter with sharper cut-off and reduced size , 2008 .

[5]  Majid Tayarani,et al.  Miniature Planar UWB Bandpass Filters with Circular Slots in Ground , 2008 .

[6]  Adnan Görür,et al.  Resonance characteristics of capacitively loaded cpw open-loop resonators , 2003 .

[7]  R. Coccioli,et al.  Planar PBG Structures: Basic Properties and Applications , 2000 .

[8]  N. Suntheralingam,et al.  Novel SRR Loaded Waveguide Bandstop Filters , 2006, 2006 IEEE Antennas and Propagation Society International Symposium.

[9]  W. Weir.  Automatic measurement of complex dielectric constant and permeability at microwave frequencies , 1974 .

[10]  Tatsuo Itoh,et al.  Novel 2-D photonic bandgap structure for microstrip lines , 1998 .

[11]  J. Dimmock,et al.  Losses in left-handed materials. , 2003, Optics express.

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

[13]  A. M. Nicolson,et al.  Measurement of the Intrinsic Properties of Materials by Time-Domain Techniques , 1970 .

[14]  Txema Lopetegi,et al.  Multiple-frequency-tuned photonic bandgap microstrip structures , 2000 .

[15]  Thomas M. Weller,et al.  Capacitively‐loaded CPW shunt stub notch filters , 2003 .

[16]  Jian Zhang,et al.  Sharp-rejection low-pass filter with controllable transmission zero using complementary split ring resonators (csrrs) , 2007 .

[17]  Steven G. Johnson,et al.  Photonic Crystals: Molding the Flow of Light , 1995 .

[18]  Tatsuo Itoh,et al.  A uniplanar compact photonic-bandgap (UC-PBG) structure and its applications for microwave circuit , 1999 .

[19]  Wee Sang Park,et al.  Novel configurations of planar multilayer magic-T using microstrip-slotline transitions , 2002 .

[20]  Abbas Omar,et al.  Controlled capacitance and inductance behaviour of L-shaped defected ground structure for coplanar waveguide , 2005 .

[21]  J. Laskar,et al.  A Broadband Planar Magic-T Using Microstrip–Slotline Transitions , 2008, IEEE Transactions on Microwave Theory and Techniques.

[22]  Y. Qian,et al.  A design of the low-pass filter using the novel microstrip defected ground structure , 2001 .

[23]  G. Deschamps,et al.  Impedance properties of complementary multiterminal planar structures , 1959 .

[24]  Eli Yablonovitch,et al.  Guest editorial: Electromagnetic crystal structures, design, synthesis, and applications , 1999 .

[25]  Shau-Gang Mao,et al.  Effective electromagnetic parameters of novel distributed left-handed microstrip lines , 2005 .

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