[1] Zhu Chen, Zhou Jianyi,. Compact dual-band bandpass filter for WLAN systems [J]. Journal of Southeast University (English Edition), 2010, 26 (4): 509-512. [doi:10.3969/j.issn.1003-7985.2010.04.001]

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Compact dual-band bandpass filter for WLAN systems()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

26

Issue:

2010 4

Page:

509-512

Research Field:

Electronic Science and Engineering

Publishing date:

2010-12-30

Info

Title:

Compact dual-band bandpass filter for WLAN systems

Author(s):

Zhu Chen;  Zhou Jianyi

State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China

Keywords:

dual-band;  parallel coupled microstrip lines;  stepped-impedance-resonators(SIRs)

PACS:

TN713+.5

DOI:

10.3969/j.issn.1003-7985.2010.04.001

Abstract:

A novel dual-band planar microstrip filter using parallel coupled microstrip lines and open-loop stepped-impedance resonators(SIRs)loaded with two shunt open stubs is presented. By tuning the physical lengths of open-loop SIRs, parallel coupled microstrip lines and two stubs, the bandpass filter has good dual-passband performance at 2.55 and 5.35 GHz and high isolation between the two passbands. The relative bandwidths of the two passbands are 11.8% and 16.8%, respectively. Compared with the conventional open-loop SIR filters, the designed filter has a comparatively broader fractional bandwidth at the second passband. So it can cover all the wireless LAN(local area network)bands. In addition, the filter has the features of low loss, high rejection and low ripple. The measured results are in good agreement with the simulated responses by HFSS software.

References:

[1] Tsai L C, Huse C W. Dual-band bandpass filters using equallength coupled-serial-shunted lines and Z-transform techniques [J]. IEEE Trans Microwave Theory Tech, 2004, 52(4): 1111-1117.
[2] Lee S, Lee Y. A planar dual-band filter based on reduced-length parallel coupled lines [J]. IEEE Microwave Wireless Components Letters, 2010, 20(1): 16-18.
[3] Liu Y, Dou W B. A dual-band filter realized by alternately connecting the main transmission-line with shunt stubs and shunt serial resonators [J]. IEEE Microwave Wireless Components Letters, 2009, 19(5): 296-298.
[4] Zhang Y P, Sun M. Dual-band microstrip bandpass filter using stepped-impedance resonators with new coupling schemes [J]. IEEE Trans Microwave Theory Tech, 2006, 54(10): 3779-3785.
[5] Zhou M, Tang X, Xiao F. Compact dual band bandpass filter using novel E-type resonators with controllable bandwidths [J]. IEEE Microwave Wireless Components Letters, 2008, 18(12): 779-781.
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[7] Kuo J T, Cheng H S. Design of quasi-elliptic function filters with a dual-passband response [J]. IEEE Microwave Wireless Components Letters, 2004, 14(10): 472-474.
[8] Huang T H, Chen H J, Chang C S, et al. A novel compact ring dual-mode filter with adjustable second-passband for dual-band applications [J]. IEEE Microwave Wireless Components Letters, 2006, 16(6): 360-362.
[9] Weng M H, Wu H W, Su Y K. Compact and low loss dual-band bandpass filter using pseudo-interdigital stepped impedance resonators for WLANs [J]. IEEE Microwave Wireless Component Letters, 2007, 17(3): 187-189.
[10] Chen C Y, Hsu C Y, Chuang H R. Design of miniature planar dual-band filter using dual-feeding structures and embedded resonators [J]. IEEE Microwave Wireless Components Letters, 2006, 16(12): 669-671.
[11] Chen C Y, Hsu C Y. A simple and effective method for microstrip dual-band filters design [J]. IEEE Microwave Wireless Components Letters, 2006, 16(3): 246-248.
[12] Mondal P, Mandal M K. Design of dual-band bandpass filters using stub-loaded open-loop resonators [J]. IEEE Trans Microwave Theory Tech, 2008, 56(1): 150-155.

Memo

Memo:

Biographies: Zhu Chen(1985—), male, graduate; Zhou Jianyi(corresponding author), male, doctor, professor, jyzhou@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.60621002, 60702027, 60921063), the National Basic Research Program of China(973 Program)(No.2010CB327400), the National High Technology Research and Development Program of China(863 Program)(No.2008ZX03005-001, 2008AA01Z223, 2009AA011503).
Citation: Zhu Chen, Zhou Jianyi. Compact dual-band bandpass filter for WLAN systems[J].Journal of Southeast University(English Edition), 2010, 26(4):509-512.

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