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Dual-Band Unequal Power Divider based on CRLH Transmission Line  

Yoo, Jae-Hyun (Department of Radio Communication Engineering, Kumoh National Institute of Technology)
Kim, Young (Department of Radio Communication Engineering, Kumoh National Institute of Technology)
Yoon, Young-Chul (Department of Electronics & Information Communication Eng., Kwandong University)
Abstract
In this paper, the unequal power divider based on CRLH (Composite Right/Left-Handed) transmission line with dual-band characteristic is proposed. They consist of dual-band branch line hybrid coupler, the connection between input and isolation port of hybrid coupler and ${\lambda}/4$ impedance transformer. When the transmission line between input and isolation port of hybrid coupler is asymmetrical connected, the divider is obtained the output results of the equal phase and unequal power dividing ratio. The simulation results of the divider represent the power ratio of 0 dB ~ 20 dB. To validate a function of divider, the hybrid coupler and transformer with 880 MHz and 1850 MHz is implemented. As a result, the proposed unequal divider obtains the power ratio of 3.2 dB ~ 8.8 dB at 880 MHz and 2.5 dB ~ 14.0 dB at 1850 MHz.
Keywords
CRLH transmission line; Unequal power divider; Dual-band; Metamaterial;
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