Patent ID: 9153865
Filing Date: 2015-10-06
Classification: H01Q

Abstract:
1. An antenna device comprising: an antenna including a first conductor including a power feed end and a second conductor including a ground end; and a matching circuit including a first inductance element loaded at the power feed end of the first conductor, and a second inductance element loaded at the ground end of the second conductor and magnetic-field coupled to the first inductance element; wherein the antenna is configured to resonate in a plurality of resonance modes including an even mode and an odd mode; the first inductance element and the second inductance element are wound and connected such that magnetic fields are mutually strengthened for one of the even mode and the odd mode, and such that the magnetic fields are mutually weakened for the other of the even mode and the odd mode; another end of the first conductor and another end of the second conductor are connected to one another, and the antenna defines a loop-shaped radiation element; and the first inductance element and the second inductance element are subtractive polarity coupled to each other.