Dual-Band Microstrip Bandpass Filter Using Stepped-Impedance Resonators With New Coupling Schemes

A microstrip bandpass filter using stepped-impedance resonators is designed in low-temperature co-fired ceramic technology for dual-band applications at 2.4 and 5.2 GHz. New coupling schemes are proposed to replace the normal counterparts. It is found that the new coupling scheme for the interstages can enhance the layout compactness of the bandpass filter; while the new coupling scheme at the input and output can improve the performance of the bandpass filter. To validate the design and analysis, a prototype of the bandpass filter was fabricated and measured. It is shown that the measured and simulated performances are in good agreement. The prototype of the bandpass filter achieved insertion loss of 1.25 and 1.87 dB, S11 of -29 and -40 dB, and bandwidth of 21% and 12.7% at 2.4 and 5.2 GHz, respectively. The bandpass filter is further studied for a single-package solution of dual-band radio transceivers. The bandpass filter is, therefore, integrated into a ceramic ball grid array package. The integration is analyzed with an emphasis on the connection of the bandpass filter to the antenna and to the transceiver die

[1]  Yong-Xin Guo,et al.  Dual-band bandpass filter in LTCC , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..

[2]  Mitsuo Makimoto,et al.  Microwave Resonators and Filters for Wireless Communication , 2001 .

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

[4]  Chih-Ming Tsai,et al.  Planar filter design with fully controllable second passband , 2005, IEEE Transactions on Microwave Theory and Techniques.

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

[6]  R. Emigh.  Electrical design for high data rate signals in conventional, BT based PBGA substrates using wire bonded interconnection , 2003, Proceedings of the 5th Electronics Packaging Technology Conference (EPTC 2003).

[7]  Jen-Tsai Kuo,et al.  Microstrip stepped impedance resonator bandpass filter with an extended optimal rejection bandwidth , 2003 .

[8]  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.

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

[10]  Tae-Gyu Chang,et al.  Design and analysis of integrated‐circuit package antenna (ICPA) for dual‐band wireless transceivers , 2006 .

[11]  Lei Zhu,et al.  Coupling dispersion of parallel-coupled microstrip lines for dual-band filters with controllable fractional pass bandwidths , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..