Design of an asymmetrical dual-band WLAN filter in liquid crystal polymer (LCP) system-on-package technology

A single-input-single-output (SISO) dual-band filter operating at ISM 2.4-2.5GHz and UNII 5.15-5.85GHz frequency bands, using the novel "dual behavior resonators" technique has been developed. Exploiting the strong second resonant frequency of resonators to realize the filtering response, allows for achieving the asymmetric shape and the good rejection between the two bands. The insertion loss and return loss at the central frequency are -2.4 dB and -15 dB for the 2.4-GHz band, respectively, and -1.8 dB and -10 dB for the 5-GHz band, respectively. The filter has been fabricated using the novel liquid crystal polymer (LCP) based multilayer packaging technology, enabling a low cost SOP implementation.

[1]  Eric Rius,et al.  Narrow bandpass filters using dual-behavior resonators , 2003 .

[2]  C. Quendo,et al.  Narrow bandpass filters using dual-behavior resonators based on stepped-impedance stubs and different-length stubs , 2004, IEEE Transactions on Microwave Theory and Techniques.

[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]  Pre-Power Amplifier for 5.2 - 5.8 GHz Band , 2002 .

[5]  J.R. Long,et al.  A low-voltage 5.1-5.8-GHz image-reject receiver with wide dynamic range , 2000, IEEE Journal of Solid-State Circuits.

[6]  J. Laskar,et al.  Liquid crystal polymer-based integrated passive development for RF applications , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[7]  H. Ainspan,et al.  A 5.2 GHz 3.3 V I/Q SiGe RF transceiver , 1999, Proceedings of the IEEE 1999 Custom Integrated Circuits Conference (Cat. No.99CH36327).

[8]  P.J. Sullivan,et al.  A 5GHz BiCMOS RFIC front end for IEEE 802.11a/hiperLAN wireless LAN , 2002, Proceedings of the 28th European Solid-State Circuits Conference.

[9]  Bruce A. Wooley,et al.  A 5-GHz CMOS transceiver for IEEE 802.11a wireless LAN systems , 2002 .

[10]  G. Ponchak,et al.  Characterization of liquid crystal polymer (LCP) material and transmission lines on LCP substrates from 30 to 110 GHz , 2004, IEEE Transactions on Microwave Theory and Techniques.