Novel Planar Multimode Bandpass Filters with Radial-Line Stubs

This paper presents a novel approach for designing planar multimode wideband bandpass fllters with good selectivity. The multimode resonator is composed of an open-ended microstrip line with length of half-wavelength (‚=2) and several radial-line stubs. By using difierent kinds of radial-line loaded stubs, difierent kinds of responses including three-pole and four-pole bandpass fllters can be realized. Depending on electric fleld distribution and equivalent circuit model, the characteristics of the fllter are analyzed. To verify the proposed method, two fllters are implemented. The measured results exhibit good agreement with the simulation.

[1]  Franco Giannini,et al.  Planar Circuit Analysis of Microstrip Radial Stub , 1984 .

[2]  Qing-Xin Chu,et al.  Novel Microstrip Right-Angled Triangular Patch Resonator Bandpass Filter , 2008 .

[3]  Lin Li,et al.  A quasi‐elliptic wideband bandpass filter using a novel multiple‐mode resonator constructed by an asymmetric compact microstrip resonant cell , 2009 .

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

[5]  Fatima Salete Correra,et al.  A triple‐mode bandpass filter using a modified circular patch resonator , 2009 .

[6]  Shao-Guo Mo,et al.  DESIGN OF TRIPLE-MODE BANDPASS FILTER USING IMPROVED HEXAGONAL LOOP RESONATOR , 2009 .

[7]  K. Yeo,et al.  A novel planar multimode bandpass filter with radial perturbation , 2009 .

[8]  Yong-Chang Jiao,et al.  Design of Novel Dual-Band Bandpass Filter with Microstrip Meander-Loop Resonator and CSRR DGS , 2008 .

[9]  Franco Giannini,et al.  Planar Circuit Analysis of Microstrip Radial Stub (Short Paper) , 1984 .

[10]  Chang-Hong Liang,et al.  NOVEL DESIGN OF DUAL-MODE BANDPASS FILTER USING RECTANGLE STRUCTURE , 2008 .

[11]  W. Menzel,et al.  Compact microstrip bandpass filter with two transmission zeros using a stub-tapped half-wavelength line resonator , 2003, IEEE Microwave and Wireless Components Letters.

[12]  Yahia M. M. Antar,et al.  New elliptic microstrip /spl lambda//4-resonator filters , 2001, APMC 2001. 2001 Asia-Pacific Microwave Conference (Cat. No.01TH8577).

[13]  Y. X. Wang,et al.  Miniaturized Dual-Mode Bandpass Filter with Controllable Harmonic Response for Dual-Band Applications , 2009 .

[14]  L. Zhang,et al.  Compact Dual-Mode Bandpass Filters Using Hexagonal Meander Loop Resonators , 2009 .

[15]  Xiu Yin Zhang,et al.  Dual-Band Bandpass Filters Using Stub-Loaded Resonators , 2007, IEEE Microwave and Wireless Components Letters.

[16]  C. Liang,et al.  Novel Design of Dual-Mode Bandpass Filter With Triangular Structure , 2008 .