Novel substrate integrated folded waveguide filter

9. CONCLUSION In the present work, a novel compact microstrip low-pass filter using a coupled DGS and a compensated microstrip line is proposed. The new DGS consists of two squareheads connected with a deformed U-gap. The equivalent circuit parameters of the DGS are extracted by using parametric relationship. It has been found that the proposed filter could have a compact size, high rejection, sharp transition domain, and wide stop-band. The measurement results have shown good agreement with the theoretical results. Finally, this newly proposed compact and high-performance lowpass filter is expected to be used in various microwave system

[1]  H. Uchimura,et al.  Development of the "laminated waveguide" , 1998, 1998 IEEE MTT-S International Microwave Symposium Digest (Cat. No.98CH36192).

[2]  Jia-Sheng Hong,et al.  Compact folded-waveguide resonators , 2004, 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535).

[3]  Wei Hong,et al.  A single-layer folded substrate integrated waveguide (SIW) filter , 2005, 2005 Asia-Pacific Microwave Conference Proceedings.

[4]  Paul R. Young,et al.  Photoimageable thick-film millimetre-wave metal-pipe rectangular waveguides , 2001 .

[5]  A. Boutejdar,et al.  Improved circuit model for DGS based lowpass filter , 2004, IEEE Antennas and Propagation Society Symposium, 2004..

[6]  Ke Wu,et al.  The substrate integrated circuits - a new concept for high-frequency electronics and optoelectronics , 2003, 6th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service, 2003. TELSIKS 2003..

[7]  K. Wu,et al.  Integrated microstrip and rectangular waveguide in planar form , 2001, IEEE Microwave and Wireless Components Letters.

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

[9]  B. Sanz-Izquierdo,et al.  Substrate integrated folded waveguides (SIFW) and filters , 2005, IEEE Microwave and Wireless Components Letters.

[10]  Wolfgang Menzel,et al.  Millimeter-Wave 3D Integration Techniques using LTCC and Related Multilayer Circuits , 2000, 2000 30th European Microwave Conference.

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

[12]  Sangwook Nam,et al.  A New Type of Low Pass Filter With Defected Ground Structure , 2002, 2002 32nd European Microwave Conference.

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

[14]  A. Boutejdar,et al.  Control of bandstop response of cascaded microstrip low-pass-bandstop filters using arrowhead slots in backside metallic ground plane , 2005, 2005 IEEE Antennas and Propagation Society International Symposium.