Patent ID: 8723753
Filing Date: 2014-05-13
Classification: H01P,H01Q

Abstract:
1. An antenna device comprising: a first antenna element that resonates with a first resonant frequency; a second antenna element that resonates with a second resonant frequency; and at least one frequency stabilizing circuit connected to a feeding end of at least one of the first antenna element and the second antenna element; wherein the at least one frequency stabilizing circuit includes a first series circuit and a second series circuit, the first series circuit includes a first coil conductor and a second coil conductor connected in series to the first coil conductor, the second series circuit includes a third coil conductor and a fourth coil conductor connected in series to the third coil conductor; the first coil conductor and the second coil conductor are arranged to define a first closed magnetic circuit; the third coil conductor and the fourth coil conductor are arranged to define a second closed magnetic circuit; and the first closed magnetic circuit and the second closed magnetic circuit are coupled to each other.