[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]
Copy
Compact dual-band bandpass filter for WLAN systems(
)
用于无线局域网的小型化双频段带通滤波器
)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
- 用于无线局域网的小型化双频段带通滤波器
- Author(s):
- Zhu Chen, Zhou Jianyi
- State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
- 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.
- 提出了一个新型的平面微带双频段带通滤波器, 由加载双分支线的开环阶梯阻抗谐振器和平行耦合微带线组成.通过调节开环阶梯阻抗谐振器、平行耦合微带线和加载分支线的长度, 带通滤波器在2.55与5.35GHz具有很好的双通带特性且在其间有很好的隔离度.两者的相对带宽分别为11.8%与16.8%.与传统的开环阶梯阻抗谐振器相比, 该带通滤波器在第2频带有更宽的带宽, 可以覆盖WLAN在高频段的整个范围.该双频段带通滤波器具有低损耗、高隔离、低纹波的特性.通过比较HFSS软件的仿真结果与实际测得的结果发现, 两者具有很好的一致性.
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.
[6] Sun S, Zhu L. Compact dual-band microstrip bandpass filter without external feeds [J]. IEEE Microwave Wireless Components Letters, 2005, 15(10): 644-646.
[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.