Laminated balun transformer

Details Laminated balun transformer Laminated balun transformer

2005-06-07

2005-06-07

Mai, Anh (Department: 2832)

Inductor devices

Coil or coil turn supports or spacers

Printed circuit-type coil

C336S232000, C336S223000

Reexamination Certificate

active

06903643

ABSTRACT:
A balun transformer includes a structure with three .lambda./4 strip lines for converting an unbalanced signal in an unbalanced transmission line into a balanced signal in a balanced transmission line. The balun transformer includes a first dielectric sheet on which a first strip line provided, a second dielectric sheet placed under the first dielectric sheet and on which a second strip line electro-magnetically coupled to the first strip line is provided, a third dielectric sheet placed under the second dielectric sheet and on which a ground pattern is provided, and a fourth dielectric sheet placed under the third dielectric sheet and on which a third strip line is provided. The balun transformer includes the reduced number of strip lines in comparison with the conventional laminated balun transformer, so that the production cost is reduced.

REFERENCES:
patent: 6285273 (2001-09-01), Morikawa
patent: 6388551 (2002-05-01), Morikawa
patent: 6628189 (2003-09-01), Yazaki et al.

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