Miniaturization of Branch-Line Coupler Using Composite Right/Left-Handed Transmission Lines with Novel Meander-shaped-slots CSSRR

• Main Authors: Hui-yong Zeng, Guang-ming Wang, Zhong-wu Yu, Xiao-kuan Zhang, Tian-peng Li
• Format: Article
• Language: English
• Published: Spolecnost pro radioelektronicke inzenyrstvi 2012-06-01
• Series: Radioengineering
• Subjects: Branch-line coupler; complementary split single ring resonators; composite right/left-handed transmission lines; meander-shaped-slots; miniaturization
• Online Access: http://www.radioeng.cz/fulltexts/2012/12_02_0606_0610.pdf

A novel compact-size branch-line coupler using composite right/left-handed transmission lines is proposed in this paper. In order to obtain miniaturization, composite right/left-handed transmission lines with novel complementary split single ring resonators which are realized by loading a pair of meander-shaped-slots in the split of the ring are designed. This novel coupler occupies only 22.8% of the area of the conventional approach at 0.7 GHz. The proposed coupler can be implemented by using the standard printed-circuit-board etching processes without any implementation of lumped elements and via-holes, making it very useful for wireless communication systems. The agreement between measured and stimulated results validates the feasible configuration of the proposed coupler.