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US 7,548,134 B2Granted
Transmission line transformer
AssigneeKorea Advanced Institute of Science and Technology
InventorsChangkun Park, Younsuk Kim, Songcheol Hong
Life of this patent
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Abstract
A transmission line transformer is disclosed. The transformer improves efficiency and a dynamic range of a power amplifier. The transformer is formed to have a plurality of load impedances as the primary side of the transmission line transformer is separated to form a plurality of primary transmission lines with parasitic components which are different from each other. The transformer is used as an impedance matching circuit of the power amplifier requiring a plurality of load impedances.
Claims5
A transmission line transformer comprising:
- a plurality of primary transmission lines having unequal parasitic components;
- and
- a secondary transmission line having one end connected to an output,
- wherein the secondary transmission line is disposed between the plurality of primary transmission lines, and
- the plurality of primary transmission lines have different cross-sectional areas, the cross-sections being taken in a direction perpendicular to a direction in which the plurality of transmission lines extend.
2 more elements
Dependencies are inferred from the claim text.