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http://dx.doi.org/10.5916/jkosme.2009.33.1.159

A Study on Characteristics of Coupled Line Employing Periodical Ground Structure on GaAs MMIC  

Kim, Se-Ho (한국해양대학교 전파공학과)
Kang, Suk-Youb (한국해양대학교 전파공학과)
Yun, Young (한국해양대학교 전파공학과)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.33, no.1, 2009 , pp. 159-165 More about this Journal
Abstract
In this study, using a periodical ground structure(PGS) on GaAs monolithic microwave integrated circuit(MMIC), transmission line with a high isolation characteristic was developed for application to compact signal/bias lines of highly integrated MMIC. And the origin of the high isolation characteristic was theoretically investigated. The high isolation characteristic was originated from a resonance between adjacent microstrip lines employing PGS. With only a spacing of $20{\mu}m$, the coupled microstrip line employing PGS showed an isolation value of -47 dB at 60 GHz. The frequency range for high isolation was easily controlled by changing the PGS structure. Above results indicate that microstrip lines employing PGS are very useful for application to compact signal/bias lines of highly integrated MMIC requiring a high isolation characteristics between lines. In addition, equivalent circuit employing closed-form equation for the coupled line with PGS was also extracted.
Keywords
Coupled line; Periodical ground structure(PGS); GaAs; Monolithic microwave integrated circuit(MMIC);
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