A new miniaturized ultra-wideband bandpass filter with embedded reconfigurable multiband frequency notch function was designed and implemented by embedding all the passive components into a printed circuit board with a high dielectric constant. The proposed filter consists of compact 2U-shaped DGS resonators shunt connected to parallel coupled lines to achieved frequency notch. To tune the notched band, suitable capacitor elements within the inner/outer U-DGS and RF PIN diode within the outer U-DGS are integrated. A curve fitting formula is derived to show the effect of the capacitor value on the center frequency of the notched band, which is decreased by 56.7%. These capacitors improved the quality factor and have the effect of reducing the filter size by 72% as compared to other filters. The RF PIN diode in the outer U-DGS acts as a switch to exhibit a band notch covering the bandwidth of the WLAN for IEEE 802.11 a/h at 5.5 GHz and RFID ISO 18000 series pars5 in microwave (MW) which is set at 5.8 GHz, 6.1 GHz and 6.8 GHz, and the other bands. RF PIN diodes control the notched band and raises it from 5.25 GHz to 6.85 GHz (27%) or remove the band notched according to its positions. In order to validate the feasibility of the proposed structure, UWB BPF with center frequency of 6.85 GHz is designed, fabricated, and measured. The filter has passband from 3.2 GHz to 10.7 GHz and notched band designed to generate stop band from 5.25 to 6.85 GHz, and the two transmission zeros are observable at 2 GHz and 12.5 GHz, respectively by measurement. This paper shows the miniaturized filter with size 6.7 mm x 65 mm occupying a circuit area of about 0.41λg by 0.39λg. The measured results for the proposed filter are in good agreement with simulations and verifies the excellent performance of the designed filter and the validity of the proposed approach.
2. Razalli, M. and M. N. Hamidon, "Novel compact microstrip ultra-wideband filter utilizing short-circuited stubs with less vias," Progress In Electromagnetics Research, Vol. 88, 91-104, 2008.
doi:10.2528/PIER08102303
3. Ali, A. and Z. Hu, "Metamaterial resonator based wave propagation notch for ultra wide band filter applications," IEEE Antennas Wireless Propag. Lett., Vol. 7, 210-212, Sep. 2008.
doi:10.1109/LAWP.2008.920964
4. Fallahzadeh, S. and M. Tayarani, "A new microstrip UWB bandpass filter using defected microstrip structure," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 7, 893-902, 2010.
doi:10.1163/156939310791285254
5. Menzel, W., M. S. R. Tito, and L. Zhu, Low-loss ultra-wideband (UWB) filters using suspended stripline, Proc. 2005 Asia-Pacific Microw. Conf., Vol. 4, 214-2151, Dec. 2005.
6. Li, K., D. Kurita, and T. Matsui, "An ultra-wideband bandpass filter using broadside-coupled microstrip-coplanar waveguide structure," 2005 IEEE MTT-S Int. Dig., 67-678, Jun. 2005.
7. Yang, G.-M., R. Jin, C. Vittoria, V. G. Harris, and N. X. Sun, "Small ultra-wideband (UWB) bandpass filter with notched band," IEEE Microwave and Wireless Components Letters, Vol. 18, No. 3, 176-178, Oct. 2008.
doi:10.1109/LMWC.2008.916781
8. Gao, S. S., S. Q. Xiao, J. P. Wang, X. S. Yang, Y. X. Wang, and B. Z. Wang, "A compact UWB bandpass filter with wide stopband," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 8-9, 1043-1049, 2008.
doi:10.1163/156939308784158661
9. Lee, C.-H., I.-C. Wang, and L.-Y. Chen, "MMR-based band-notched UWB bandpass filter design," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 17-18, 2407-2415, 2008.
doi:10.1163/156939308787543921
10. Thomson, N. and J. S. Hong, "Compact ultra-wideband microstrip/coplanar waveguide bandpass filter," IEEE Microwave and Wireless Components Letters, Vol. 17, No. 3, 184-186, Mar. 2007.
doi:10.1109/LMWC.2006.890462
11. Wei, F., L. Chen, X.-W. Shi, and B. Liu, "Compact UWB bandpass filter with tunable notch band based on folded SIR," Electronic Lett., Vol. 47, No. 22, Oct. 2011.
12. Huang, J.-Q., Q.-X. Chu, and C.-Y. Liu, "Compact UWB filter based on surface coupled structure with dual notched bands," Progress In Electromagnetics Research, Vol. 106, 311-319, 2010.
doi:10.2528/PIER10062203
13. Shaman, H. and J.-S. Hong, "Asymmetric parallel-coupled lines for notch implementation in UWB filters," IEEE Microwave and Wireless Components Letters, Vol. 17, No. 7, 51-518, Jul. 2007.
14. Hsiao, P.-Y. and R.-M. Weng, "Compact open-loop UWB filter with notched band," Progress In Electromagnetics Research Letters, Vol. 7, 149-159, Feb. 2009.
doi:10.2528/PIERL09022501
15. Nosrati, M. and M. Daneshmand, "Compact microstrip UWB double/single notch-band BPF based on wave's cancellation theory," IET Microwave Antennas and Propagations, Vol. 6, No. 8, 862-868, Mar. 2012.
doi:10.1049/iet-map.2011.0519
16. Song, K., T. Pan, and Q. Xue, "Compact ultra-wideband notch-band bandpass filters using multiple slotline resonators," Microwave and Optical Technology Letters, Vol. 54, No. 5, 1132-1135, May 2012.
doi:10.1002/mop.26756
17. Shaman, H. and J.-S. Hong, "Switchable embedded notch structure for UWB bandpass filter," IEEE Microwave and Wireless Components Letters, Vol. 18, No. 9, 59-592, Sep. 2008.
18. Wu, Z., Y. Shim, and M. Rais-Zadeh, "Miniaturized UWB filters integrated with tunable notch filters using a silicon-based integrated passive device technology ," IEEE Trans. Microw. Theory and Tech., Vol. 60, No. 3, 518-527, Mar. 2012.
doi:10.1109/TMTT.2011.2178428
19. Mokhtaari, M. and J. Bornemann, Tunable notch characteristics in microstrip ultra-wideband filters, Asia Pacific Microwave Conference, APMC, 937-940, 2009.
20. Computer Simulation Technology MICROWAVE STODITM, 2011.
21. Agilent Advanced Design System (ADS), 2009.
22. Behdad, N. and K. Sarabandi, "Dual-band reconfigurable antenna with a very wide tenability range," IEEE Trans. on Antenna and Propag., Vol. 54, No. 2, Feb. 2000.
23. Hsiao, P.-Y. and R.-M. Weng, "Compact open-loop UWB filter with notched band," Progress In Electromagnetics Research Letters, Vol. 7, 149-159, 2009.
doi:10.2528/PIERL09022501
24. HPND 4005, Avago Technologies, United States.
25. Wang, B.-Z., S. Xiao, and J. Wang, "Reconfigurable patch-antenna design forwideband wireless communication systems," IET Microwave Antennas and Propagations, Vol. 1, No. 2, 414-419, 2007.
doi:10.1049/iet-map:20050349
26. Hsiao, P.-Y. and R.-M. Weng, "C-ultra-wideband bandpass filter with WLAN notch band," Microwave and Optical Technology Letters, Vol. 52, No. 5, 1215-1218, May 2010.
doi:10.1002/mop.25153
Submit
