Comparison of MMIC Lumped and Quasi-lumped Quadrature Coupler Performance

Author

Cantu, H.I. ; Fusco, V.F.

Author_Institution

Inst. of Electron., Commun. & Inf. Technol., Queen´´s Univ., Belfast

fYear

2006

fDate

10-15 Sept. 2006

Firstpage

29

Lastpage

31

Abstract

In this work the performance of two 90deg GaAs hybrid coupler MMICs based on lumped and quasi-lumped designs are compared for S-band operation. The quasi-lumped coupler consists of parallel lambda/8 long 50 Omega lines separated at each end by lumped capacitors, and as a consequence occupies only 0.15 the area of an equivalent lambda/4 distributed quadrature coupler. The lumped coupler is a lumped line version of a classical lambda/4 quadrature coupler. The experimental S-parameter performances for both couplers are compared. The quasi-lumped design has only 0.5 dB insertion loss as compared to 1.3 dB for the MMIC lumped hybrid. In addition the quasi-lumped hybrid offers superior return loss as well as reduced sensitivity to process variations

Keywords

III-V semiconductors; MMIC; S-parameters; UHF couplers; gallium arsenide; 0.5 dB; 1.3 dB; 50 ohm; GaAs; MMIC; S-band; S-parameter; quasi-lumped quadrature coupler; Admittance; Capacitors; Couplings; Equations; Frequency; Gallium arsenide; Insertion loss; MMICs; Topology; Transmission lines; Even and Odd Mode Analysis; GaAs MMIC; Quadrature Couplers;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2006. 36th European

Conference_Location

Manchester

Print_ISBN

2-9600551-6-0

Type

conf

DOI

10.1109/EUMC.2006.281173

Filename

4057738