Model for the low-frequency performance of ferrite-loaded balun transformers

Author

Raab, Frederick H.

Author_Institution

Green Mountain Radio Res. Co., Colchester

fYear

2007

fDate

3-8 June 2007

Firstpage

7

Lastpage

10

Abstract

This paper presents a model for the low- frequency response of the ferrite-loaded transmission-line transformer. The ferrite is characterized by measured impedance and the performance of the transformer is determined through basic circuit-analysis techniques. The validity of the model is established by measurements on a 50-Omega balun with various groundings of the load. Input impedance, SWR, gains, and phases are predicted accurately at frequencies up to several hundred megahertz.

Keywords

baluns; electric impedance; frequency response; high-frequency transformers; network analysis; transmission lines; HF transformers; VHF transformers; circuit-analysis techniques; ferrite-loaded balun transformers; impedance characterization; load grounding; low-frequency performance model; resistance 50 ohm; transmission-line transformer; Conductors; Ferrites; Frequency; Impedance matching; Impedance measurement; Inductors; Permeability; Transformers; Transmission lines; VHF circuits; Balun; HF transformers; VHF transformers; ferrites;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium, 2007. IEEE/MTT-S International

Conference_Location

Honolulu, HI

ISSN

0149-645X

Print_ISBN

1-4244-0688-9

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2007.380204

Filename

4263726