GaAs versus quartz FGC lines for MMIC applications

Author

Papapolymerou, John ; East, Jack ; Katehi, Linda P B

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA

Volume

46

Issue

11

fYear

1998

fDate

11/1/1998 12:00:00 AM

Firstpage

1790

Lastpage

1793

Abstract

The performance of finite-ground coplanar (FGC) lines on GaAs and quartz for high-frequency monolithic-microwave integrated-circuit (MMIC) applications is experimentally investigated in this paper. The FGC lines on GaAs are covered with a thin layer of polyimide for passivation purposes. Permittivity and attenuation characteristics for these lines up to 118 GHz are presented and compared with the corresponding characteristics of FGC lines on a quartz substrate, which are commonly used for millimeter-wave applications. The impact of different characteristic impedance values in attenuation properties for both GaAs and quartz is also addressed. Results indicate that the loss on the lines does not depend on the substrate material, but rather on line geometry. All the lines tested show low-loss and low-dispersion characteristics

Keywords

MMIC; coplanar transmission lines; coplanar waveguides; gallium arsenide; passivation; permittivity; quartz; GaAs; HF MMIC applications; SiO₂; attenuation characteristics; characteristic impedance values; finite-ground coplanar lines; line geometry; low-dispersion; low-loss; modified CPW structure; passivation; permittivity characteristics; quartz lines; thin layer of polyimide; Attenuation; Coplanar waveguides; Dielectric substrates; Fabrication; Frequency; Gallium arsenide; MMICs; Microstrip; Passivation; Polyimides;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.734582

Filename

734582