Design of the quasi-0 dB backward wave-coupled line coupler using CRLH-TL based on stepped-impedance open stub-loaded dual-mode resonator

References

• Pozar DM. Microwave engineering. New York: John Wiley & Sons; 2009.
   Google Scholar
• Caloz C, Itoh T. Electromagnetic metamaterials: transmission line theory and microwave applications. New York: John Wiley & Sons; 2005.
   Google Scholar
• Abbosh AM. Broadband parallel-coupled quadrature coupler with floating-potential ground plane conductor. Microw Opt Technol Lett. 2008;50(9):2304–2307. doi: 10.1002/mop.23701
   Web of Science ®Google Scholar
• Abbosh AM. Closed-form design method for broadband parallel-coupled microstrip coupler with tight coupling and practical spacing. Microw Opt Technol Lett. 2011;53(12):2790–2794. doi: 10.1002/mop.26395
   Web of Science ®Google Scholar
• Hsu SK, Tsai CH, Wu TL. A novel miniaturized forward-wave directional coupler with periodical mushroom-shaped ground plane. IEEE Trans Microw Theory Tech. 2010;58(8):2277–2283. doi: 10.1109/TMTT.2010.2052869
   Web of Science ®Google Scholar
• Hsu SK, Yen JC, Wu TL. A novel compact forward-wave directional coupler design using periodical patterned ground structure. IEEE Trans Microw Theory Tech. 2011;59(5):1249–1257. doi: 10.1109/TMTT.2011.2104978
   Web of Science ®Google Scholar
• Yen JC, Hsu SK, Lin TH, et al. A broadband forward-wave directional coupler using periodic Y-shaped ground via structures with arbitrary coupling levels. IEEE Trans Microw Theory Tech. 2013;61(1):38–47. doi: 10.1109/TMTT.2012.2227778
   Web of Science ®Google Scholar
• Keshavarz R, Movahhedi M, Abdipour A. A broadband and compact asymmetrical backward coupled-line coupler with high coupling level. AEU Int J Electron Commun. 2012;66(7):569–574. doi: 10.1016/j.aeue.2011.11.009
   Web of Science ®Google Scholar
• Wang X, Yin WY, Wu KL. A dual-band coupled-line coupler with an arbitrary coupling coefficient. IEEE Trans Microw Theory Tech. 2012;60(4):945–951. doi: 10.1109/TMTT.2012.2185949
   Web of Science ®Google Scholar
• Wu Y, Sun W, Leung SW, et al. Single-layer microstrip high-directivity coupled-line coupler with tight coupling. IEEE Trans Microw Theory Tech. 2013;61(2):746–753. doi: 10.1109/TMTT.2012.2235855
   Web of Science ®Google Scholar
• Wang L, Wang G, Sidén J. Design of high-directivity wideband microstrip directional coupler with fragment-type structure. IEEE Trans Microw Theory Tech. 2015;63(12):3962–3970. doi: 10.1109/TMTT.2015.2490671
   Web of Science ®Google Scholar
• Wang L, Wang G, Sidén J. High-performance tight coupling microstrip directional coupler with fragment-type compensated structure. IET Microw Antennas Propag. 2017;11(7):1057–1063. doi: 10.1049/iet-map.2016.0905
   Web of Science ®Google Scholar
• Tabatabaeian ZS, Neshati MH. Development of broadband forward-wave directional couplers loaded by periodic patterned ground structure. Int J RF Microw Comput-Aided Eng. 2017;27(8):e21135. doi: 10.1002/mmce.21135
   Web of Science ®Google Scholar
• Caloz C, Itoh T. A novel mixed conventional microstrip and composite right/left-handed backward-wave directional coupler with broadband and tight coupling characteristics. IEEE Microw Wireless Comp Lett. 2004;14(1):31–33. doi: 10.1109/LMWC.2003.821506
   Web of Science ®Google Scholar
• Caloz C, Sanada A, Itoh T. A novel composite right-/left-handed coupled-line directional coupler with arbitrary coupling level and broad bandwidth. IEEE Trans Microw Theory Tech. 2004;52(3):980–992. doi: 10.1109/TMTT.2004.823579
   Web of Science ®Google Scholar
• Hirota A, Tahara Y, Yoneda N. A compact forward coupler using coupled composite right/left-handed transmission lines. IEEE Trans Microw Theory Tech. 2009;57(12):3127–3133. doi: 10.1109/TMTT.2009.2034304
   Web of Science ®Google Scholar
• Van Nguyen H, Caloz C. Generalized coupled-mode approach of metamaterial coupled-line couplers: coupling theory, phenomenological explanation, and experimental demonstration. IEEE Trans Microw Theory Tech. 2007;55(5):1029–1039. doi: 10.1109/TMTT.2007.895646
   Web of Science ®Google Scholar
• Ibrahim AA, Safwat AM, El-Hennawy H. All planar compact size microstrip CRLH arbitrary coupling directional coupler. Microw Opt Technol Lett. 2013;55(1):115–119. doi: 10.1002/mop.27270
   Web of Science ®Google Scholar
• Ma Y, Zhang HW, Li Y. Novel symmetrical coupled-line directional coupler based on resonant-type composite right-/left-handed transmission lines. Prog Electromagnet Res. 2013;140:213–226. doi: 10.2528/PIER13041803
   Web of Science ®Google Scholar
• Chi PL, Liu CC. Novel dual-band quasi-0-dB coupled-line coupler using the composite right/left-handed transmission lines. IEEE Trans Comp Pack Manuf Technol. 2014;4(2):259–267.
   Web of Science ®Google Scholar
• Sorocki J, Staszek K, Piekarz I, et al. Directional couplers with reduced coupling requirements as connection of coupled-line sections and left-handed transmission lines. IET Microwav Antennas Propag. 2014;8(8):580–588. doi: 10.1049/iet-map.2013.0369
   Web of Science ®Google Scholar
• Sorocki J, Staszek K, Piekarz I, et al. Application of RH and LH sections for reduction of coupling coefficients in two-section asymmetric directional couplers. Int J Microw Wireless Technol. 2016;8(3):559–565. doi: 10.1017/S1759078715000410
   Web of Science ®Google Scholar
• Yi X, Shi Y, Yu Z, et al. Wideband and miniaturized forward-wave directional coupler using periodical parallel plates and vertical meander lines. IEEE Trans Circuits Syst Express Briefs. 2019 (Early Access).
   Google Scholar
• Belenguer A, Borja AL, Boria VE. Balanced dual composite right/left-handed microstrip line with modified complementary split-ring resonators. IEEE Antennas Wirel Propag Lett. 2013;12:880–883. doi: 10.1109/LAWP.2013.2271983
   Web of Science ®Google Scholar