US 11,967,780 B2
Antenna structure and communications terminal
Rihui Li, Dongguan (CN); Rui Jiang, Dongguan (CN); and Zipeng Hou, Dongguan (CN)
Assigned to VIVO MOBILE COMMUNICATION CO., LTD., Dongguan (CN)
Filed by VIVO MOBILE COMMUNICATION CO., LTD., Dongguan (CN)
Filed on Jun. 10, 2021, as Appl. No. 17/344,899.
Application 17/344,899 is a continuation of application No. PCT/CN2019/116599, filed on Nov. 8, 2019.
Claims priority of application No. 201811521027.X (CN), filed on Dec. 12, 2018.
Prior Publication US 2021/0305702 A1, Sep. 30, 2021
Int. Cl. H01Q 9/04 (2006.01); H01Q 5/328 (2015.01)
CPC H01Q 9/0442 (2013.01) [H01Q 5/328 (2015.01); H01Q 9/0414 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An antenna structure for a communications terminal, wherein the antenna structure comprises: an antenna radiator, a signal source, a first capacitor, and a first tuning circuit;
a first terminal of the antenna radiator is grounded;
a first terminal of the first capacitor and a first terminal of the first tuning circuit are electrically connected to a connection point of the antenna radiator, a second terminal of the first capacitor is electrically connected to the signal source, and a second terminal of the first tuning circuit is grounded, wherein
a total length of the antenna radiator and a first length between a second terminal of the antenna radiator and a connection point electrically connected to the first tuning circuit are designed in order for an antenna impedance of the first terminal of the first capacitor at target frequencies to be in the first quadrant of a Smith chart, wherein the target frequencies are at least some frequencies in frequency bands covered by the antenna radiator.