Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits
Patent
1997-05-30
1999-03-23
Gensler, Paul
Wave transmission lines and networks
Coupling networks
Balanced to unbalanced circuits
333246, H01P 510
Patent
active
058865896
ABSTRACT:
A printed circuit balanced to unbalanced (balun) transformer. The balun includes strip circuitry having first, second and third conductors. The first conductor provides a primary inductor of the transformer. The primary inductor has a first electrode adapted for coupling to an unbalanced transmission line and a second electrode electrically connected to the ground plane conductor. The second conductor provides a first secondary inductor of the transformer. The first secondary inductor is inductively coupled to a first portion of the primary inductor. A first electrode of the first secondary inductor is electrically connected to the ground plane conductor and a second electrode of the first primary inductor coupled to a first of a pair of output ports. The conductor provides a second secondary inductor of the transformer. The second secondary inductor is inductively coupled to a second portion of the primary inductor. A first electrode of the second secondary inductor is electrically connected to the ground plane conductor and a second electrode of the second secondary inductor is coupled to a second of the pair of output ports.
REFERENCES:
patent: 4739289 (1988-04-01), Cripps
patent: 5061910 (1991-10-01), Bouny
patent: 5534830 (1996-07-01), Ralph
patent: 5644272 (1997-07-01), Dabrowski
patent: 5777527 (1998-07-01), Sanders
Analog Devices Incorporated
Gensler Paul
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