Title :
Size reduction and wide bandwidth rat-race coupler with shunt capacitors and composite Right/Left-Handed Transmission Line
Author :
Kim, Seung-Hwan ; Son, Kang-Ho ; Kim, Ell-Kou ; Lee, Young-Soon ; Kim, Young ; Yoon, Young-Chul
Author_Institution :
Dept. of Radio Commun. Eng., Kumoh Nat. Inst. of Technol., Gumi, South Korea
Abstract :
This paper introduces a rat-race coupler, with size reduction and bandwidth enhancement, using shunt capacitors, high impedance lines and Composite Right/Left-Handed Transmission Lines (CRLH-TLs). The reduced method of line length is used to combine a short length high impedance line and two shunt capacitors. Also, there is combined CRLH meta-material, using nonlinear phase characteristic of CRLH-TL that consists of series capacitors and shunt inductors, so as to obtain wide bandwidth. The implemented rat-race coupler shows a novel design with compact size that is smaller by 10% and a bandwidth that is larger by 60% than that of a conventional rat-race coupler.
Keywords :
capacitors; composite materials; coupled transmission lines; inductors; metamaterials; waveguide couplers; CRLH metamaterial; CRLH-TL; bandwidth enhancement; composite right-left-handed transmission lines; nonlinear phase characteristic; series capacitors; short length high impedance line; shunt capacitors; shunt inductors; size reduction; wide bandwidth rat-race coupler; Bandwidth; Capacitors; Coupling circuits; Impedance; Inductors; Metamaterials; Power transmission lines; Radio frequency; Shunt (electrical); Transmission lines; CRLH-TL; Rat-race coupler; meta-material; size reduction; wide bandwidth;
Conference_Titel :
Microwave Conference, 2009. APMC 2009. Asia Pacific
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-2801-4
Electronic_ISBN :
978-1-4244-2802-1
DOI :
10.1109/APMC.2009.5384491
