Design and implementation of microwave dual‐band bandpass filters using microstrip composite resonators

In this article, a novel type of dual‐band bandpass filter (DBBPF) is proposed by using microstrip composite resonators, and its design method is developed based on the lumped‐element equivalent circuit of the filter. Both the midband frequencies and the passband widths of the dual bands of the filter can be controlled separately. Four DBBPFs with different specifications are designed, fabricated, and tested, and the measured frequency responses agree favorably with theoretical predictions, validating sufficiently the proposed design theory and filter structures. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1628–1632, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23451

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

[2]  T. Ishizaki,et al.  A miniaturized monolithic dual band filter using ceramic lamination technique for dual mode portable telephones , 1997, 1997 IEEE MTT-S International Microwave Symposium Digest.

[3]  C. Quendo,et al.  An original topology of dual-band filter with transmission zeros , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[4]  C. Chen,et al.  Design of an LTCC tri-band transceiver module for GPRS mobile applications , 2004, 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535).

[5]  Sheng-Fuh Chang,et al.  Dual-band step-impedance bandpass filter for multimode wireless LANs , 2004 .

[6]  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.

[7]  Chih-Hung Chien,et al.  A dual-band RF transceiver for multistandard WLAN applications , 2005, IEEE Transactions on Microwave Theory and Techniques.

[8]  K.-K.M. Cheng,et al.  Novel dual-band planar resonator and admittance inverter for filter design and applications , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..

[9]  Zhewang Ma,et al.  Design and realization of bandpass filters using composite resonators to obtain transmission zeros , 2005, 2005 European Microwave Conference.

[10]  Hong-Ming Lee,et al.  Transmission-line filter design with fully controllable second passband , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..

[11]  Lei Zhu,et al.  Novel Design of Microstrip Bandpass Filters with a Controllable Dual-Passband Response: Description and Implementation , 2006, IEICE Trans. Electron..