Tunable Bandstop Filter Based on Split Ring Resonators Loaded Coplanar Waveguide
Keywords:
Coplanar waveguide, tunable bandstop filter, varactor loaded split ring resonatorsAbstract
In this paper, a novel electrical tunable bandstop filter based on coplanar waveguide (CPW) loaded with split ring resonators (SRRs) is proposed. The unit cell of the bandstop filter is formed by etching single SRR on the CPW back substrate side, and the SRRs can be excited by the CPW slot’s magnetic field. Lumped equivalent circuit models are developed to analyze the frequency responses, and it shows that by loading the common cathode varactor diodes at the split region of the SRR outer ring, the resonant frequency of the bandstop filter can be electronically adjusted by tuning the reverse voltage of the varactor diodes. The prototype with overall size of 26.6 mm ? 50 mm ? 0.508 mm was designed and fabricated to validate the proposed structure. The measured tunable resonant frequency of the fabricated bandstop filter is from 2.19 GHz to 2.31 GHz while a reverse bias voltage is varying from 0 V to 30 V. It also shows that the -10 dB bandwidth is less than 45 MHz.
Downloads
References
K. Aydin and E. Ozbay, “Capacitor-loaded split ring resonators as tunable metamaterial components,” Journal of Applied Physics, vol. 101, no. 2, pp. 24911, Jan. 2007.
B. D. Horwath and T. Al-Attar, “Simulation and design of a tunable patch antenna,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 26, no. 12, pp. 1039-1045, Dec. 2011.
Q. Xiang, Q. Feng, X. Huang, and D. Jia, “Electrical tunable microstrip lc bandpass filters with constant bandwidth,” IEEE Transactions on Microwave Theory and Techniques, vol. 61, no. 3, pp. 1124-1130, 2013.
X. G. Huang, Q. Y. Feng, and Q. Y. Xiang, “Bandpass filter with tunable bandwidth using quadruple-mode stub-loaded resonator,” IEEE Microwave and Wireless Components Letters, vol. 22, no. 4, pp. 176-178, Apr. 2012.
Y. S. Li, W. X. Li, and W. H. Yu, “A switchable UWB slot antenna using SIS-HSIR and SIS-SIR for multi-mode wireless communications applications,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 27, no. 4, pp. 340-351, Apr. 2012.
Q. Y. Xiang, Q. Y. Feng, and X. G. Huang, “Halfmode substrate integrated waveguide (HMSIW) filters and its application to tunable filters,” Journal of Electromagnetic Waves and Applications, vol. 25, no. 14-15, pp. 2043-2053, 2011.
Q. Y. Xiang, Q. Y. Feng, X. G. Huang, and D. H. Jia, “Substrate integrated waveguide filters and mechanical/electrical reconfigurable half-mode substrate integrated waveguide filters,” Journal of Electromagnetic Waves and Applications. vol. 26, no. 13, pp. 1756-1766, Sep. 2012.
X. Y. Zhang, C. H. Chan, Q. Xue, and B. J. Hu, “RF tunable bandstop filters with constant bandwidth based on a doublet configuration,” IEEE Transactions on Industrial Electronics, vol. 59, no. 2, pp. 1257-1265, Feb. 2012.
Q. Y. Xiang, Q. Y. Feng, and X. G. Huang, “A novel microstrip bandstop filter and its application to reconfigurable filter,” Journal of Electromagnetic Waves and Applications, vol. 26, pp. 1039-1047, June 2012.
Q. Y. Xiang, Q. Y. Feng, and X. G. Huang, “Bandstop filter based on complementary split ring resonators defected microstrip structure,” Journal of Electromagnetic Waves and Applications, vol. 25, no. 13, pp. 1895-1908, 2011.
H. Aghayari, N. Komjani, and N. M. Garmjani, “A novel integrated corrugated waveguide bandpass filter,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 27, no. 1, pp. 67-73, Jan. 2012.
G. E. Al-Omair, S. F. Mahmoud, and A. S. AlZayed, “Lowpass and bandpass filter designs based on DGS with complementary split ring resonators,” Applied Computational Electromagnetics Society (ACES) Journal. vol. 26, no. 11, pp. 907-914, Nov. 2011.
J. C. Liu, W. Shao, and B. Z. Wang, “A dual-band metamaterial design using double SRR structures,” Applied Computational Electromagnetics Society (ACES) Journal. vol. 26, no. 6, pp. 459-463, June 2011.
M. C. Tang, S. Q. Xiao, C. J. Li, C. L. Wei, and B. Z. Wang, “Scan blindness elimination using composite defected ground structures and edgecoupled split ring resonators,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 26, no. 7, pp. 572-583, July 2011.
M. C. Tang, S. Q. Xiao, D. Wang, J. Xiong, K. Chen, and B. Z. Wang, “Negative index of reflection in planar metamaterial composed of single split-ring resonators,” Applied Computational Electromagnetics Society (ACES) Journal, vol. 26, no. 3, pp. 250-258, March 2011.
F. Martin, J. Bonache, F. Falcone, M. Sorolla, and R. Marques, “Split ring resonator-based lefthanded coplanar waveguide,” Applied Physics Letters, vol. 83, no. 22, pp. 4652-4654, 2003.
R. Marques, F. Mesa, J. Martel, and F. Medina, “Comparative analysis of edge- and broadsidecoupled split ring resonators for metamaterial design - theory and experiments,” IEEE Transactions on Antennas and Propagation, vol. 51, no. 10, pp. 2572-2581, Oct. 2003.
A. Radkovskaya, M. Shamonin, C. Stevens, G. Faulkner, D. Edwards, E. Shamonina, and L. Solymar, “Resonant frequencies of a combination of split rings: experimental, analytical and numerical study,” Microwave and Optical Technology Letters, vol. 46, no. 5, pp. 473-476, 2005.
