Study on Transmission Characteristics of Transformers of a RF Splitter

Tomohiko KANIE
Hiroaki KATO
Yuichi NORO
Takashi TAKEO
Kiwamu ODA
Haruhiko ITO

IEICE TRANSACTIONS on Electronics   Vol.E90-C    No.6    pp.1329-1335
Publication Date: 2007/06/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.6.1329
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
transformer,  RF splitter,  CATV,  ferrite,  

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In this paper, we report on the transmission characteristics of transformers of a RF splitter widely used in CATV systems. From the point of view of broadening the splitter's operating frequency, the relationship between the RF transformer's transmission characteristics and design parameters has been investigated using computer-aided engineering. Based on the calculations, a sample device has been fabricated to confirm the theoretical results. It has been found that the configulation of the transformer winding is the most important factor affecting device performance. By selecting the appropriate winding, excessive loss can be suppressed to less than 1.6 dB and 3 dB in a frequency range of 20 MHz to 2,600 MHz for the cases of 2-way and 4-way splitters, respectively.