Patent ID: 11862867
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An antenna device comprising:
a first radiating element;
a second radiating element;
a first coil coupled to at least one of the first radiating element and a feeding circuit;
a second coil coupled to the second radiating element and coupled to the first coil via an electromagnetic field; and
an inductor; wherein
the first radiating element is provided by a portion of a housing;
the first radiating element and the second radiating element are coupled to each other via an electric field;
the first coil and the second coil define a transformer;
at a fundamental resonant frequency of a resonance circuit defined by the second radiating element and the transformer, an absolute value of a phase difference between a current flowing into the second radiating element due to the electromagnetic field and a current flowing into the second radiating element due to the electric field exceeds about 90 degrees; and
the inductor is coupled in series with the second coil to generate a harmonic resonance in which the resonance circuit resonates at a (2n+1)th harmonic, where n is an integer equal to or greater than 1.