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Compact Hybrid Branch-line Couplers and Rat-Race Couplers with Periodic Stepped Stubs  

Lee Chang On (Division of Electrical and Computer Engineering, Ajou University)
Kim Won-Ki (Division of Electrical and Computer Engineering, Ajou University)
Kim Sang-Tae (ITEP)
Shin Chull-Chai (Division of Electrical and Computer Engineering, Ajou University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.41, no.12, 2004 , pp. 115-124 More about this Journal
Abstract
In this paper, we introduce the advanced compact transmission line with periodic stepped stubs. They are more effective than normal stubs in ATL. The short stepped stubs loading of transmission line work as effective shunt capacitance and that was proved by equivalent circuit based on transmission line theory and quasi-static analysis. And the compact branch-line coupler and the compact rat-race coupler via proposed compact microstrip line were designed at 1.8 ㎓. They have 677 ㎟ and 913 ㎟, respectively, and they are 62% and 45% of normal design.
Keywords
CLCTL(capacitively loaded compact transmission line); ATL(artificial transmission line); Branch-line coupler; Rat-race coupler;
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