Printed BALUN circuits

Details Printed BALUN circuits Printed BALUN circuits

1999-07-14

2000-10-24

Gensler, Paul

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

333 26, H03H 742

Patent

active

061373761

ABSTRACT:
A planar BALUN circuit comprises two separate parallel branches with three capacitive elements. The values of the capacitive elements are selected to provide impedances which first of all enhance balanced current flow and which also impede and reduce unbalanced current flow. The circuit is provided so as to lie substantially in a single plane as a pattern disposed on a printed circuit board together with either certain discrete capacitive elements or with capacitive structures which are also printed on the board. The BALUN circuits of the present invention are particularly useful for circuits operating in the gigahertz range and are particularly useful in light weight devices such as cellular telephones and cellular telephone systems.

REFERENCES:
patent: 4857869 (1989-08-01), Terakawa et al.
patent: 5587692 (1996-12-01), Graham et al.
patent: 6052039 (2000-04-01), Chiou et al.

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