A Simple Ultra-Wideband Suspended Stripline Bandpass Filter With Very Wide Stop-Band

This letter introduces a simple ultra-wideband suspended stripline filter with a pass-band from 3.1 to 10.6 GHz and a very wide stop-band up to more than 25 GHz. The filter is realized by capacitive coupling of a quasi-lumped low-pass filter to the I/O ports. Insertion loss in the pass-band is better than 0.5 dB. The filter has a length of 13.8 mm. Excellent agreement is achieved between measured and simulated results.

[1]  Yo-Shen Lin,et al.  Wideband coplanar-waveguide bandpass filters with good stopband rejection , 2004, IEEE Microwave and Wireless Components Letters.

[2]  Lei Zhu,et al.  Ultra-Wideband (UWB) Bandpass Filters , 2005 .

[3]  Shih-Cheng Lin,et al.  Compact Ultra-Wideband Bandpass Filters Using Composite Microstrip–Coplanar-Waveguide Structure , 2006, IEEE Transactions on Microwave Theory and Techniques.

[4]  W. Menzel,et al.  Miniaturized Suspended Stripline Filters for Integration into Extended Circuits , 2006, 2006 European Microwave Conference.

[5]  H. Ishida,et al.  Design and analysis of UWB band pass filter with ring filter , 2004, 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535).

[6]  W. Menzel,et al.  Quasi-lumped suspended stripline filters and diplexers , 2005, IEEE Transactions on Microwave Theory and Techniques.

[7]  W. Menzel.  A novel miniature suspended stripline filter , 2003, 33rd European Microwave Conference Proceedings (IEEE Cat. No.03EX723C).

[8]  E. M. Jones,et al.  Microwave Filters, Impedance-Matching Networks, and Coupling Structures , 1980 .

[9]  W. Menzel,et al.  Low-loss ultra-wideband (UWB) filters using suspended stripline , 2005, 2005 Asia-Pacific Microwave Conference Proceedings.

[10]  Wolfgang Menzel.  Broadband Filter Circuits using an Extended Suspended Substrate Transmission Line Configuration , 1992, 1992 22nd European Microwave Conference.

[11]  W. Menzel,et al.  Ultra-wideband bandpass filter with hybrid microstrip/CPW structure , 2005, IEEE Microwave and Wireless Components Letters.

[12]  W. Menzel,et al.  Multilayer suspended stripline and coplanar line filters , 1994 .