NOVEL DUAL-MODE DUAL-BAND BANDPASS FILTER USING DOUBLE SQUARE-LOOP STRUCTURE

A dual-mode dual-band bandpass microstrip filter using double square-loop structure is proposed in this paper. Each of the square-loop forms a dual-mode resonator with controllable respective passband. Two tuning patches placed symmetrically at the side of the perturbation patch are used to change the higher passband frequency, while while keeping the lower invariable. Several attenuation poles in the stopband are realized to improve the selectivity of the proposed bandpass filter. The filter is evaluated by experiment and simulation with good agreement.

[1]  R. Levy.  Zolotarev Functions, A New Distributed Prototype Filter, and the Design of Mixed Lumped/Distributed Components , 1970 .

[2]  Michael J. Lancaster,et al.  Realisation of quasielliptic function filter using dual-mode microstrip square loop resonators , 1995 .

[3]  Michael J. Lancaster,et al.  Microstrip triangular patch resonator filters , 2000, 2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017).

[4]  Kai Chang,et al.  Compact dual-mode elliptic-function bandpass filter using a single ring resonator with one coupling gap , 2000 .

[5]  Adnan Görür,et al.  Description of coupling between degenerate modes of a dual-mode microstrip loop resonator using a novel perturbation arrangement and its dual-mode bandpass filter applications , 2004, IEEE Transactions on Microwave Theory and Techniques.

[6]  C. Hsue,et al.  Dual-band bandpass filters using equal-length coupled-serial-shunted lines and Z-transform technique , 2004 .

[7]  Lin-Chuan Tsai,et al.  Dual-band bandpass filters using equal-length coupled-serial-shunted lines and Z-transform technique , 2004, IEEE Transactions on Microwave Theory and Techniques.

[8]  Lei Zhu,et al.  Novel design of dual-band microstrip bandpass filters with good in-between isolation , 2005, 2005 Asia-Pacific Microwave Conference Proceedings.

[9]  Wen-Hua Tu,et al.  Miniaturized dual-mode bandpass filter with harmonic control , 2005, IEEE Microwave and Wireless Components Letters.

[10]  Y. Li,et al.  Novel Planar Bandpass Filters Using Single Patch Resonators with Corner Cuts , 2006 .

[11]  Microwave Filters Using Waveguides Filled by Multi-Layer Dielectric , 2006 .

[12]  Morteza Kazerooni,et al.  Simulation, Analysis, Design and Applications of Array Defected Microstrip Structure (ADMS) Filters Using Rigorously Coupled Multi-Strip (RCMS) Method , 2006 .

[13]  Yong-Xin Guo,et al.  High-selectivity dual-band stepped-impedance bandpass filter , 2006 .

[14]  Quan Xue,et al.  Dual-Mode Dual-Band Bandpass Filter Using Stacked-Loop Structure , 2006, IEEE Microwave and Wireless Components Letters.

[15]  J. W. Stewart,et al.  Electromagnetic Characterization of a Magnetic Material Using an Open-ended Waveguide Probe and a Rigorous Full-wave Multimode Model , 2006 .

[16]  J.-K. Xiao,et al.  Novel Compact Microstrip Square Ring Bandpass Filters , 2006 .