Patent ID: 11929560
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A dual-band antenna device configured to perform communication at a first frequency in a predetermined frequency band and at a second frequency in a frequency band higher than the predetermined frequency band, the antenna device comprising:
a ground conductor;
a folded antenna conductor comprising a first linear part and a second linear part that face each other;
an LC resonant circuit that is in the folded antenna conductor, that is configured to pass the first frequency, and that is configured to attenuate the second frequency; and
a feeding point between the ground conductor and the folded antenna conductor,
wherein there is a narrow gap between the first linear part and the second linear part of the folded antenna conductor, a distance between the first linear part and the second linear part being shorter at the narrow gap than at a portion between the first linear part and the second linear part other than the narrow gap,
wherein the second linear part connects to the feeding point through the first linear part,
wherein the folded antenna conductor comprises a floating-island-like part between the first linear part and the second linear part, and
wherein the narrow gap includes a first narrow gap part between the floating-island-like part and the first linear part, and a second narrow gap part between the floating-island-like part and the second linear part.