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US 2014/0368270 A1Published application
Marchand balun and power amplifier using the same
AssigneeNXP B.V.
InventorsGerard Jean-Louis Bouisse, Rajeev Busgeeth
Life of this patent
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Abstract
A Marchand balun has a primary transmission line with a width smaller than the two secondary transmission lines. The two secondary transmission lines also have different widths and lengths. This arrangement provides an imbalance between the widths and lengths of the transmission lines. It has been found that this imbalance can enable improved amplitude unbalance and phase unbalance.
Claims14
A Marchand balun, comprising:
- a primary transmission line from a first primary port (Port1) to an open termination having a length corresponding to half of a wavelength within an intended operating range;
- a first secondary transmission line from a first secondary port (Port2) to ground having a length corresponding to quarter of a wavelength within an intended operating range;
- a second secondary transmission line from ground to a second secondary port (Port3) having a length corresponding to a quarter of a wavelength within an intended operating range, the first and second secondary transmission lines each being electromagnetically coupled with and following the shape of a respective section of the primary transmission line;
- wherein the primary transmission line has a width smaller than the second secondary transmission line, and the second secondary transmission line has a width smaller than the first secondary transmission line,
- and wherein the first secondary transmission line is longer than the second secondary transmission line.
2 more elements
Dependencies are inferred from the claim text.