DocumentCode :
1274638
Title :
Ultra-Wideband Single and Dual Baluns Based on Substrate Integrated Coaxial Line Technology
Author :
Zhu, Fang ; Hong, Wei ; Chen, Ji-Xin ; Wu, Ke
Author_Institution :
State Key Lab. of Millimeter Waves, Southeast Univ., Nanjing, China
Volume :
60
Issue :
10
fYear :
2012
Firstpage :
3062
Lastpage :
3070
Abstract :
In this paper, ultra-wideband (UWB) Marchand baluns using substrate integrated coaxial line (SICL) technology are first proposed. SICL is a shielded planar coaxial line, which is very suitable for wideband and high-speed applications due to its broad unimodal operation band, low insertion loss, very small dispersion, and easy integration with other planar circuits. In order to achieve wider bandwidth and better VSWR performance of the SICL balun, a pair of quarter-wave impedance transformers are inserted into the balanced line. The impedance characteristics of the proposed SICL baluns are analyzed, and the parameters that determine the balun bandwidth are discussed. Then, curves of the balun resistance, reactance, and the SICL characteristic impedance are presented. According to these curves, the design parameters of the proposed SICL baluns can easily be determined. To verify these ideas, an UWB SICL single balun and an UWB SICL dual balun are designed, fabricated, and measured. Both full-wave simulated and measured results are presented, and good agreement between them is observed. The proposed SICL baluns have a simple structure and good performance, which are suitable for applications in UWB communication systems.
Keywords :
baluns; coaxial cables; coaxial waveguides; impedance convertors; losses; substrate integrated waveguides; ultra wideband communication; SICL baluns; SICL characteristic impedance; SICL technology; UWB Marchand baluns; UWB SICL dual balun; UWB SICL single balun; UWB communication systems; VSWR performance; balanced line; balun reactance; balun resistance; broad unimodal operation band; full-wave simulated; low insertion loss; planar circuits; quarter-wave impedance transformers; shielded planar coaxial line; substrate integrated coaxial line technology; ultra-wideband Marchand baluns; ultra-wideband dual baluns; ultra-wideband single baluns; very small dispersion; Bandwidth; Conductors; Distortion measurement; Impedance; Impedance matching; Microstrip; Substrates; Balun; quarter-wavelength impedance transformer; substrate integrated coaxial line (SICL); ultra-wideband (UWB);
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.2012.2209448
Filename :
6287616
Link To Document :
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