Tuned transformer balun circuit and applications thereof

Details Tuned transformer balun circuit and applications thereof Tuned transformer balun circuit and applications thereof

2006-10-31

2006-10-31

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

C333S177000

Reexamination Certificate

active

07129803

ABSTRACT:
A tuned transformer balun circuit includes a transformer balun, a first tuning capacitor, a second tuning capacitor, and a third tuning capacitor. A first plate of the first tuning capacitor is operably coupled to a first node of the differential winding and a second plate of the first tuning capacitor is operably coupled to a circuit ground. A first plate of the tuning capacitor is operably coupled to a second node of the differential winding and a second plate of the second tuning capacitor is operably coupled to the circuit ground. A first plate of the third tuning capacitor is operably coupled to a first node of the single-end winding and the second plate of the third tuning capacitor is operably coupled to transceiver radio frequency signals, wherein, based on loading of the single-ended winding and the differential winding, the first, second, and third tuning capacitors resonate with the transformer balun to provide efficient energy transfer from the transmitter section to the antenna.

REFERENCES:
patent: 5644272 (1997-07-01), Dabrowski
patent: 6654595 (2003-11-01), Dexter
patent: 6809581 (2004-10-01), Rofougaran et al.

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