US 9,812,773 B1
Antenna design for reduced specific absorption rate
Ming Zheng, Cupertino, CA (US)
Assigned to Amazon Technologies, Inc., Seattle, WA (US)
Filed by Amazon Technologies, Inc., Reno, NV (US)
Filed on Nov. 18, 2013, as Appl. No. 14/82,418.
Int. Cl. H01Q 1/52 (2006.01); H01Q 1/24 (2006.01); H01Q 21/00 (2006.01); H01Q 5/392 (2015.01); H01Q 5/378 (2015.01)
CPC H01Q 1/52 (2013.01) [H01Q 1/243 (2013.01); H01Q 5/378 (2015.01); H01Q 5/392 (2015.01); H01Q 21/0006 (2013.01)] 20 Claims
OG exemplary drawing
 
3. An antenna, comprising:
a first antenna element configured to transmit radio frequency (RF) energy around a center frequency, the first antenna element being configured such that during transmission of the RF energy the first antenna element is characterized by a first specific absorption rate (SAR) hotspot proximate a first location on the first antenna element; and
a second antenna element disposed proximate and electrically floating relative to the first antenna element and configured to receive a portion of the RF energy from the first antenna element via electromagnetic coupling in a region proximate a second location on the first antenna element, wherein the second location is displaced from the first location by a predetermined distance, the second antenna element also being configured to transmit the portion of the RF energy around the center frequency, the second antenna element also having a geometry at a third location on the second antenna element in the region, wherein the geometry promotes coupling of the RF energy from the first antenna element such that during transmission of the portion of the RF energy received from the first antenna element the second antenna element is characterized by a second SAR hotspot proximate the third location on the second antenna element in the region, wherein the predetermined distance ensures that the first and second SAR hotspots do not appear as a single SAR hotspot during SAR testing.