Patent ID: 9577339
Date: 2017-02-21
CPC Classifications: H01Q

Claim:
1. An antenna device comprising: a base member formed of a dielectric material and comprising first, second, and third surfaces, wherein the first surface and the third surface are opposite to each other and the second surface connects the first surface and the third surface; and a flexible board attached to the base member, the flexible board comprising a first antenna, a second antenna, a third antenna, a capacitor element, and a grounding pattern, wherein the flexible board further comprises a first area located at the first surface, a second area located at the second surface, a third area located at the third surface, and a fourth area being an extension of the first area; the grounding pattern is formed in the fourth area and comprises a first side and a second side, the first side includes a first grounding terminal, the second side is closer to the first area than the first side and comprises a second grounding terminal; the first antenna element is formed in the first area and comprises a folded-type monopole element having a first end and a second end, the first end being connected to a feeding point, the second end being connected to the first grounding terminal, the folded-type monopole element including an intermediate portion folded to divide the folded-type monopole element into a forward-path portion and a backward-path portion, and a stub being located between the forward-path portion and the backward-path portion; the second antenna element is formed in the second area and comprises a monopole element having a third end and a fourth end, the third end being directly connected to the feeding point or indirectly connected to the feeding point by part of the first antenna element, and the fourth end of the monopole element comprising a plate and being free, wherein at least a distal end portion of the monopole element is located to extend in parallel with the first antenna element; the third antenna element is formed in the third area and comprises a passive element having a fifth end and a sixth end, the fifth end being connected to the second grounding terminal, the sixth end being free, wherein at least part of the passive element is located to extend in parallel with the second antenna element to achieve capacitive coupling between the at least part of the passive element and the second antenna element; and the capacitor element is formed in the fourth area and is between the feeding point and the stub in the backward-path portion of the first antenna element.