Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits
Patent
1994-07-05
1995-09-19
Gensler, Paul
Wave transmission lines and networks
Coupling networks
Balanced to unbalanced circuits
333 26, 333 32, 333 33, H03H 742, H01P 510
Patent
active
054519144
ABSTRACT:
A transformer (300) includes several layers of substrate (202, 204, 206, 208). Sandwiched between first set of layers (204 and 206) is a runner that forms two interconnected spirals (323 and 324). These spirals run in opposite directions and form two half coils of the transformer primary. Similarly, sandwiched between the second set of layers (204 and 206) is a runner that forms two other interconnected spirals (321 and 322). These spirals run in opposite directions and form two half coils of the transformer secondary. These half coils are magnetically coupled through the substrate (206) which is substantially thinner than the other substrates (204 and 208). Ground layers (210 and 216) discourage horizontal coupling of the electromagnetic flux between the half coils (321, 322, 323, 324), hence improving the vertical flux transfer through the thin layer (206). Components (218) added to the top layer (202) provide for a device, such as an amplifier inclusive of its coupling transformer.
REFERENCES:
patent: 4494100 (1985-01-01), Stengel
patent: 4992769 (1991-02-01), Oppett
patent: 4999597 (1991-03-01), Gaynor
patent: 5003622 (1991-03-01), Ma et al.
patent: 5061910 (1991-10-01), Bouny
Gensler Paul
Ghomeshi M. Mansour
Motorola Inc.
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