Patent ID: 7289075
Filing Date: 2007-10-30
Classification: H01Q

Abstract:
1. A planar antenna comprising a dielectric substrate having a first antenna conductor in a loop shape and a second antenna conductor in a loop shape disposed so as to be adjacent to each other; wherein there is disposed a first coupling conductor, the first coupling conductor comprising a pair of coupling branch lines connected to the first antenna conductor and extending inward from the first antenna conductor, and the coupling branch lines have open ends disposed so as to be adjacent to each other and to be capacitively coupled to each other; wherein when the coupling branch lines are parallel with each other or are in alignment with each other, respective open ends of the coupling branch lines are positioned to be the closest portions of the coupling branch lines; wherein there is disposed a second coupling conductor, the second coupling conductor comprising a pair of coupling branch lines connected to the second antenna conductor and extending inward from the second antenna conductor, and the coupling branch lines have open ends disposed so as to be adjacent to each other and to be capacitively coupled to each other; wherein when the coupling branch lines are parallel with each other or in alignment with each other, both open ends of the coupling branch lines are closest portions with respect to each other; and wherein when the coupling branch lines are not parallel with each other, both open ends of the coupling branch lines or one of the open ends of the coupling branch lines is located in the vicinity of closest portions of the coupling branch lines.