Coplanar waveguide two-stage balanced MMIC amplifier using impedance-transforming lumped-distributed branchline couplers

Author

Gillick, M. ; Robertson, I.D. ; Joshi, J.S.

Author_Institution

Dept. of Electron. & Electr. Eng., King´´s Coll., London, UK

Volume

141

Issue

4

fYear

1994

fDate

8/1/1994 12:00:00 AM

Firstpage

241

Lastpage

245

Abstract

A design technique is presented for coplanar waveguide monolithic balanced amplifiers employing impedance-transforming lumped-distributed branchline couplers. A synthesis procedure and design graphs are presented for this type of coupler, which uses a combination of short transmission line sections and lumped capacitors. A two-stage balanced Ku-band MESFET amplifier using 50-to-15 Ω transforming couplers has been designed, with a chip size of only 2 mm×1.7 mm, and the measured gain is 13.7±0.2 dB over the range 14-16 GHz

Keywords

MMIC; Schottky gate field effect transistors; distributed parameter networks; impedance convertors; lumped parameter networks; microwave amplifiers; network synthesis; waveguide couplers; 13.7 dB; 14 to 16 GHz; 15 ohm; 50 ohm; Ku-band MESFET amplifier; SHF; chip size; coplanar waveguide; design graphs; gain; impedance-transforming couplers; lumped capacitors; lumped-distributed branchline couplers; monolithic balanced amplifiers; short transmission line sections; two-stage balanced MMIC amplifier;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings

Publisher

iet

ISSN

1350-2417

Type

jour

DOI

10.1049/ip-map:19941124

Filename

313234