Reduced-size branch-line and rat-race hybrids for uniplanar MMIC´s

Author

Hirota, Tetsuo ; Minakawa, Akira ; Muraguchi, Masahiro

Author_Institution

NTT Radio Commun. Syst. Lab., Yokosuka, Japan

Volume

38

Issue

3

fYear

1990

fDate

3/1/1990 12:00:00 AM

Firstpage

270

Lastpage

275

Abstract

A method of miniaturizing branch-line 90° hybrids and 180° rat-race hybrids is proposed. The method utilizes combinations of short high-impedance transmission lines and shunt lumped capacitors. The hybrids were fabricated on GaAs substrates and the validity and effectiveness of the method were confirmed through experiments at 25 GHz and 11 GHz. The fabricated hybrids demonstrate excellent design accuracy at high frequencies, with a circuit size that is more than 80% smaller than that of conventional hybrids. These hybrids are particularly suitable for uniplanar MMICs where necessary shunt connections are easily made

Keywords

MMIC; strip line components; 11 GHz; 180° rat-race hybrids; 25 GHz; CPW; GaAs; GaAs substrates; MIM capacitors; SHF; branch-line 90° hybrids; coplanar waveguide; monolithic microwave IC; short high-impedance transmission lines; shunt lumped capacitors; uniplanar MMICs; Capacitors; Couplers; Distributed parameter circuits; Frequency; Impedance; Inductance; Inductors; MMICs; Power transmission lines; Shunt (electrical);

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.45344

Filename

45344