Title :
Model for the low-frequency performance of ferrite-loaded balun transformers
Author :
Raab, Frederick H.
Author_Institution :
Green Mountain Radio Res. Co., Colchester
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;
Conference_Titel :
Microwave Symposium, 2007. IEEE/MTT-S International
Conference_Location :
Honolulu, HI
Print_ISBN :
1-4244-0688-9
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2007.380204
