US 6,982,609 B1
System method and apparatus for a three-line balun with power amplifier bias
Tom McKay, Felton, Calif. (US); Vas Postoyalko, Wakefield (United Kingdom); and Edwin Li, San Jose, Calif. (US)
Assigned to Zeevo, Santa Clara, Calif. (US)
Filed on Jul. 02, 2003, as Appl. No. 10/613,346.
Application 10/613346 is a continuation in part of application No. 10/262336, filed on Sep. 30, 2002.
Claims priority of provisional application 60/381387, filed on May 15, 2002.
Int. Cl. H03H 5/00 (2006.01); H01F 27/28 (2006.01); H01Q 9/16 (2006.01)
U.S. Cl. 333—25 18 Claims
OG exemplary drawing
 
1. A balun comprising:
a first conductor having a length of about one quarter wavelength of a selected center frequency, the first conductor having a first end connected to a first balanced power amplifier output port;
a second conductor having a length of about one quarter wavelength of the selected center frequency, the second conductor includes:
a first end connected to a second balanced power amplifier output port;
a second end connected a second end of the first conductor; and
a third conductor having a length of about one quarter wavelength of the selected center frequency, the third conductor having a first end connected to an antenna port and a second end connected to a ground potential.