US 9,812,757 B2
RF coupler having coupled line with adjustable length
Nuttapong Srirattana, Billerica, MA (US); David Scott Whitefield, Andover, MA (US); David Ryan Story, Ladera Ranch, CA (US); and Zhiyang Liu, Dunstable, MA (US)
Assigned to SKYWORKS SOLUTIONS, INC., Woburn, MA (US)
Filed by SKYWORKS SOLUTIONS, INC., Woburn, MA (US)
Filed on Jun. 19, 2015, as Appl. No. 14/745,213.
Claims priority of provisional application 62/090,015, filed on Dec. 10, 2014.
Claims priority of provisional application 62/110,248, filed on Jan. 30, 2015.
Prior Publication US 2016/0172740 A1, Jun. 16, 2016
Int. Cl. H01P 5/18 (2006.01); H01P 5/12 (2006.01)
CPC H01P 5/185 (2013.01) 22 Claims
OG exemplary drawing
 
1. A radio frequency coupler comprising:
a power input port, a power output port, a coupled port, and an isolation port;
a main transmission line electrically connected between the power input port and the power output port;
a multi-section coupled line having a first section, a second section, and a third section, an effective length of the multi-section coupled line being a length of the multi-section coupled line electrically connected between the coupled port and the isolation port, the multi-section coupled line being configured to electromagnetically couple a portion of radio frequency power traveling between the power input port and the power output port to provide coupled power at the coupled port;
a first switch disposed in series between the first and second sections of the multi-section coupled line and configured to adjust the effective length of the multi-section coupled line by selectively electrically connecting the first section to the second section; and
a second switch disposed in series between the second and third sections of the multi-section coupled line and configured to further adjust the effective length of the multi-section coupled line by selectively electrically connecting the third section to one of the first section and the second section.