A novel miniaturized composite right/left-handed (CRLH) transmission line based on the structure of spiral inter-digital is proposed and analyzed in this article. Compared with the conventional inter-digital CRLH, the proposed CRLH realizes a 25% resonace frequency shift, and the miniaturization is realized. Then, a compact bandpass filter centered at 1.00 GHz with minimum insertion loss 0.42 dB was designed, fabricated and measured. The measured results show that the band width is 61.6% and that the sharpness at the two edges of passband is 212.5 dB/GHz and 607.1 dB/GHz. This designed filter has very high selectivity. Besides, the whole size of the designed filter is 0.114λ×0.054λ. The filter realizes the miniaturization effectively, and this designed bandpass filter has good performances and smaller size than the same works in references.
2. Sanchez-Renedo, M., "High-selectivity tunable planar combline filter with source/load-multiresonator coupling," IEEE Microwave and Wireless Components Letters, Vol. 17, 513-515, 2007.
doi:10.1109/LMWC.2007.899313
3. Zhang, J., B. Cui, S. Lin, and X.-W. Sun, "Sharp-rejection low-pass filter with controllable transmission zero using complementary split ring resonators (CSRRs)," Progress In Electromagnetics Research, Vol. 69, 219-226, 2007.
doi:10.2528/PIER06122103
4. Karimian, S. and Z. R. Hu, "Miniaturized composite right/left-handed stepped-impedance resonator bandpass filter," IEEE Microwave and Wireless Components Letters, Vol. 22, 400-402, 2012.
doi:10.1109/LMWC.2012.2206018
5. Zhang, , S. B., , L. Zhu, and R. Li, "Compact quadruplet bandpass filter based on alternative J/K inverters and λ/4 resonators," IEEE Microwave and Wireless Components Letters, Vol. 22, 224-226, 2012.
doi:10.1109/LMWC.2012.2193124
6. Ren, S.-W., H.-L. Peng, J.-F. Mao, and A.-M. Gao, "Compact quasi-elliptic wideband bandpass filter using cross-coupled multiple-mode resonator," IEEE Microwave and Wireless Components Letters, Vol. 22, 397-399, 2012.
doi:10.1109/LMWC.2012.2205230
7. Fan, J., D. Zhan, C. J. Jin, and J. R. Luo, "Wideband microstrip bandpass filter based on quadruple mode ring resonator," IEEE Microwave and Wireless Components Letters, Vol. 22, 348-350, 2012.
doi:10.1109/LMWC.2012.2199977
8. Hashemi, M. R. M. and T. Itoh, "Dual-band composite right/left-handed metamaterial concept," IEEE Microwave and Wireless Components Letters, Vol. 22, 248-250, 2012.
doi:10.1109/LMWC.2012.2191274
9. Wu, G.-C., G.-M. Wang, T. Li, and C. Zhou, "Novel dual-composite right/left-handed transmission line and its application to bandstop filter," Progress In Electromagnetics Research Letters, Vol. 37, 29-35, 2013.
10. Xu, , H.-X. , G.-M. Wang, Q. Peng, and J.-G. Liang, "Novel design of tri-band bandpass filter based on fractal-shaped geometry of a complementary single split ring resonator," International Journal of Electronics, Vol. 98, 647-654, 2011.
doi:10.1080/00207217.2011.593141
11. Zhang, Q. L., W. Y. Yin, S. He, and L. S.Wu, "Compact substrate integrated waveguide (SIW) bandpass filter with complementary split ring resonators (CSRRs)," IEEE Microwave and Wireless Components Letters, Vol. 20, 426-428, 2010.
doi:10.1109/LMWC.2010.2049258
12. Zeng, H.-Y., G.-M. Wang, C.-X. Zhang, and L. Zhu, "Compact microstrip low-pass filter using complementary split ring resonators with ultra-wide stopband and high selectivity," Microwave and Optical Technology Letters, Vol. 52, No. 2, 430-433, 2010.
doi:10.1002/mop.24942
13. Wu, G.-C., G.-M. Wang, L.-Z. Hu, Y.-W. Wang, and C. Liu, "A miniaturized triple-band branch-line coupler based on simplified dual-composite right/left-handed transmission line," Progress In Electromagnetics Research C, Vol. 39, 1-10, 2013.
14. Xu, H.-X., G.-M. Wang, and M.-Q. Qi, "A miniaturized triple-band metamaterial antenna with dadiation pattern selectivity and polarization diversity," Progress In Electromagnetics Research, Vol. 13, 275-292, 2013.
Submit
