Branch-line couplers using unequal line lengths

Author

Toker, Canan ; Saglam, Mustafa ; Ozme, Mustafa ; Gunalp, Nilgun

Author_Institution

Dept. of Electr. & Electron. Eng., Middle East Tech. Univ., Ankara, Turkey

Volume

49

Issue

4

fYear

2001

fDate

4/1/2001 12:00:00 AM

Firstpage

718

Lastpage

721

Abstract

General solutions for branch-line couplers using different line lengths are provided in this paper. Explicit expressions are derived with which a hybrid with any given power division ratio can be designed. In the design, one of the characteristic impedances or lengths of the branches can be chosen arbitrarily to suit a given design specification. This approach brings flexibility in choosing the characteristic impedances or the lengths of the branches, and is helpful especially in monolithic-microwave integrated-circuit applications where restrictions imposed on microstrip transmission lines do not allow the use of conventional branch-line couplers employing quarter-wave-long lines. However, the resultant bandwidth is narrower compared to that of the conventional coupler

Keywords

MMIC; electric impedance; microstrip couplers; microwave integrated circuits; MIC applications; MMIC applications; branch lengths; branch-line couplers; characteristic impedances; hybrids; microstrip transmission lines; monolithic microwave integrated circuit; unequal line lengths; Bandwidth; Couplers; Electronics industry; Frequency; Impedance; MMICs; Microstrip; Microwave integrated circuits; Microwave technology; Power transmission lines;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.915448

Filename

915448