Patent ID: 9472850
Filing Date: 2016-10-18
CPC Classification: H01Q

Claim Text:
1. An antenna apparatus, comprising: a main antenna, having a feed point; a parasitic ground antenna unit, wherein the main antenna is electromagnetically coupled to the parasitic ground antenna to adjust the frequency of the main antenna when the frequency of the parasitic antenna is adjusted; a radio frequency signal processing unit, electrically connected to the feed point, generating or receiving a radio frequency signal; a sensing unit, outputting a first voltage, and changing a voltage value of the first voltage according to variations of a distance between the sensing unit and a human body; a frequency detecting unit, detecting an emitting/receiving frequency of the main antenna, and generating a second voltage in response to the emitting/receiving frequency of the main antenna; and a control unit, coupled to the parasitic ground antenna unit, the sensing unit and the frequency detecting unit, and adjusting an adjustment voltage according to the first voltage and the second voltage, so as to adjust a resonance frequency of the parasitic ground antenna unit.