Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
Home | Search | Notification | Authors | Submission | PIERS Home | EM Academy
Home > Vol. 124 > pp. 249-263


By X. Lin, P. Su, Y. Fan, and Z. B. Zhu

Full Article PDF (1,181 KB)

An improved designable composite right/left-handed transmission line (CRLH-TL) is presented in this paper, whose operating frequency-band and transmission characteristics can be tuned, respectively, by three structure variables. The equivalent characteristic impedance is studied carefully, and CRLH-TLs with arbitrary characteristic impedances are obtained. Some useful empirical formulae are derived for engineering application. Then, a sample of 50-Ω CRLH-TL, which can be used directly as a wide-band filter, is fabricated with the center frequency of 2.8 GHz. The measured results show that a relative 3-dB bandwidth of 74.6% is achieved, in good agreement with the simulated results. Moreover, the phase-frequency responses of our proposed CRLH-TLs are discussed in detail. A novel hybrid ring is then proposed, where 70-Ω CRLH-TL is used. At the center frequency of 5.8 GHz, equal power dividing is achieved with return loss and isolation more than 20 dB and 30 dB, respectively. The sample is finally fabricated and good agreements among theoretical analysis, simulated results, and measured results are obtained.

X. Lin, P. Su, Y. Fan, and Z. B. Zhu, "Improved CRLH-TL with Arbitrary Characteristic Impedance and its Application in Hybrid Ring Design," Progress In Electromagnetics Research, Vol. 124, 249-263, 2012.

1. Caloz, C. and T. Itoh, Electromagnetic Metamaterials: Transmission Line Theory and Microwave Applications, John Wiley & Sons, New York, 2006.

2. Chen, J.-X., J. Shi, Z.-H. Bao, and Q. Xue, "Tunable and switchable bandpass filters using slot-line Resonators," Progress In Electromagnetics Research, Vol. 111, 25-41, 2011.

3. Chaudhary, G., Y. Jeong, and J. Lim, "A broad-bandwidth dual-band bandpass filter design using composite right/left handed transmission lines," Journal of Electromagnetic Waves and Appliactions, Vol. 25, No. 14--15, 218-2147, 2011.

4. Lin, X. Q., D. Bao, H. F. Ma, and T. J. Cui, "Novel composite phase-shifting transmission-line and its application in the design of antenna array," IEEE Trans. Antennas Propag., Vol. 58, No. 2, 375-380, 2010.

5. Shamaileh, K. A. A., A. M. Qaroot, and N. Dib, "Non-uniform transmission line transfromers and their application in the design of compact multi-band Bagley power dividers with harmonics suppression," Progress In Electromagnetics Research, Vol. 113, 269-284, 2011.

6. Liu, L., J. Sun, X. Fu, J. Zhou, Q. Zhao, B. Fu, J. Liao, and D. Lippens, "Artificial magnetic properties of dielectric metamaterials in terms of effective circuit model," Progress In Electromagnetics Research, Vol. 116, 159-170, 2011.

7. Caloz, C. and T. Itoh, Application of the transmission line theory of lefthanded (LH) materials to the realization of a microstrip `LH line', IEEE AP-S Int. Symp., 412-415, San Antonio, TX, 2002.

8. Oliner, A. A., A periodic-structure negative-refractive-index medium without resonant elements, IEEE AP-S/URSI Int. Symp. Dig., Vol. 41, San Antonio, TX, 2002.

9. Iyer, A. K. and G. V. Eleftheriades, Negative refractive index metamaterials supporting 2-D waves, IEEE MTT-S Int. Microwave Symp. Dig., 1067-1070, Seattle, WA, 2002.

10. Sajin, G. I., S. Simion, F. Craciunoiu, A. A. Muller, and A. C. Bunea, "CRLH CPW antenna on magnetically biased ferrite substrate," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 5--6, 803-814, 2010.

11. Keshavarz, R., M. Movahhedi, A. Hakimi, and A. Abdipour, "A novel broad bandwidth and compact backward coupler with high coupling-level," Journal of Electromagnetic Waves and Applications, Vol. 25, No. 2--3, 283-293, 2011.

12. NaghshvarianJahromi, M., "Novel compact meta-material tunable quasi elliptic band-pass filter using microstrip to slotline transition," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 17--18, 2371-2382, 2010.

13. Feng, T., Y. Li, H. Jiang, W. Li, F. Yang, X. Dong, and H. Chen, "Tunable single-negative metamaterials based on microstrip transmission line with varactor diodes loading," Progress In Electromagnetics Research, Vol. 120, 35-50, 2011.

14. Lin, X. Q., H. F. Ma, D. Bao, and T. J. Cui, "Design and analysis of super-wide bandpass filters using a novel compact meta-structure," IEEE Trans. on Microw. Theory Tech., Vol. 55, No. 4, 747-753, 2007.

15. Tsinghua University, Microstrip Circuits, Post & Telecom Press, Beijing, 1976.

16. Pozar, D. M., Microwave Engineering, 3rd Ed., Willey, New York, 2003.

© Copyright 2014 EMW Publishing. All Rights Reserved