Compact CMOS branch-line coupler using high-Q slow-wave transmission lines

被引:1
作者
Wang, Sen [1 ,2 ]
Huang, Bo-Zong [1 ,2 ]
机构
[1] Natl Taipei Univ Technol, Dept Elect Engn, Taipei, Taiwan
[2] Natl Taipei Univ Technol, Grad Inst Comp & Commun Engn, Taipei, Taiwan
关键词
slow-wave; coplanar transmission lines; CMOS integrated circuits; branch-line coupler;
D O I
10.1002/mop.27525
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This article presents a miniaturized 90 degrees coupler incorporating slotted conductor-backed coplanar waveguide (S-CBCPW) transmission lines (TLs) and four shunt capacitors. The periodically slotted ground achieves higher slow-wave factor (SWF) or effective permittivity (epsilon eff), and lower attenuation constant. Electrical characteristics of the S-CBCPW TLs are investigated by different slotted ground layers. Moreover, trade-offs among SWF, characteristic impedance, and electrical length for the design are also discussed. Finally, the measured 24-GHz coupler not only features smallest normalized chip area among previously reported CMOS couplers but also demonstrates excellent results which are comparable to the designs at 60 GHz. (c) 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:11741178, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27525
引用
收藏
页码:1174 / 1178
页数:5
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