Analysis and design of impedance-transforming planar Marchand baluns

Author

Ang, Kian Sen ; Robertson, Ian D.

Author_Institution

Dept. of Electron. & Electr. Eng., Surrey Univ., Guildford, UK

Volume

49

Issue

2

fYear

2001

fDate

2/1/2001 12:00:00 AM

Firstpage

402

Lastpage

406

Abstract

A technique for designing impedance-transforming baluns is presented in this paper. It is based on the Marchand balun with two identical coupled lines. By varying the coupling factor of the coupled sections, a wide range of impedance transforming ratios can be achieved. In addition, a resistive network added between the balun outputs is proposed to achieve balun output matching and isolation. Microstrip baluns, matched at all ports, for transforming from a 50-Ω source impedance to 40-Ω as well as 160-Ω load terminations are realized to demonstrate the technique

Keywords

baluns; coupled transmission lines; distributed parameter networks; impedance matching; linear network analysis; linear network synthesis; microstrip components; balun output isolation; balun output matching; coupling factor variation; identical coupled lines; impedance transforming ratios; impedance-transforming balun design; microstrip baluns; planar Marchand baluns; resistive network; Couplers; Coupling circuits; Diodes; Frequency; Impedance matching; MMICs; Microstrip; Microwave integrated circuits; Monolithic integrated circuits; Wideband;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.903108

Filename

903108