Design of quarter-wave compact impedance transformers using coupled transmission lines

Author

Chramiec, J. ; Kitlinski, M.

Author_Institution

Dept. of Marine Radioelectronics, Gdynia Maritime Univ., Poland

Volume

38

Issue

25

fYear

2002

fDate

12/5/2002 12:00:00 AM

Firstpage

1683

Lastpage

1685

Abstract

Simulation examples of single- to four-section quarter-wave transformers using ideal uncoupled transmission lines, ideal symmetrical coupled lines and physical symmetrical coupled microstrip lines are given. It is shown that quite satisfactory impedance transformers may be realised in the case of coupled microstrip lines despite their unequal even and odd field mode phase velocities. Measurements on a 1 GHz coupled microstrip single section transformer confirm this conclusion.

Keywords

circuit CAD; circuit optimisation; coupled transmission lines; impedance convertors; microstrip circuits; 1 GHz; 1 GHz coupled microstrip single section transformer; coupled transmission line CAD models; coupled transmission lines; even field mode phase velocities; ideal symmetrical coupled lines; ideal uncoupled transmission lines; odd field mode phase velocities; optimisation; physical symmetrical coupled microstrip lines; quarter-wave compact impedance transformers; reflection coefficient; simulation examples; single to four-section quarter-wave transformers;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:20021119

Filename

1137464