US 12,482,927 B2
Circularly polarized antenna structures and wearable devices
Anping Zhao, Anhui (CN); and Zhouyou Ren, Anhui (CN)
Assigned to Anhui Huami Health Technology Co., Ltd., Anhui FTZ (CN)
Filed by Anhui Huami Health Technology Co., Ltd., Anhui (CN)
Filed on Jan. 31, 2023, as Appl. No. 18/162,477.
Application 18/162,477 is a continuation of application No. PCT/CN2021/012445, filed on Aug. 13, 2021.
Claims priority of application No. 202010833927.9 (CN), filed on Aug. 18, 2020; and application No. 202021727353.9 (CN), filed on Aug. 18, 2020.
Prior Publication US 2023/0170620 A1, Jun. 1, 2023
Int. Cl. H01Q 1/27 (2006.01); H01Q 7/00 (2006.01)
CPC H01Q 1/273 (2013.01) [H01Q 7/00 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An antenna structure, applicable to a wearable device, the antenna structure being circularly polarized and comprising:
a mainboard;
an annular radiator having an effective perimeter equal to a wavelength corresponding to a central operating frequency of the antenna structure;
a feeding terminal electrically connected to the radiator at a first end and connected to a feeding module of the mainboard at a second end; and
a grounding terminal electrically connected to the radiator at a first end and electrically connected to a grounding module of the mainboard through a first capacitor at a second end, wherein a current in the annular radiator is pulled by the first capacitor, such that the annular radiator produces an effective circulating current being rotated, thereby realizing a circularly polarized antenna structure.