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Compact CMOS branch‐line coupler using high‐ Q slow‐wave transmission lines
Author(s) -
Wang Sen,
Huang BoZong
Publication year - 2013
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.27525
Subject(s) - coplanar waveguide , conductor , transmission line , microwave , capacitor , electric power transmission , attenuation , materials science , optoelectronics , cmos , shunt (medical) , electrical engineering , electrical impedance , characteristic impedance , crosstalk , chip , electronic engineering , physics , engineering , optics , telecommunications , voltage , composite material , medicine , cardiology
This article presents a miniaturized 90° 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 (ε 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. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1174–1178, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27525