CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to China Application Serial Number 201911120474.9, filed Nov. 15, 2019, which is herein incorporated by reference in its entirety.

BACKGROUND

Field of Invention

The present disclosure relates to an antenna, and more particularly, to a multi-band antenna.

Description of Related Art

At present, communication technology is widely used in various fields. Moreover, communication technology has gradually matured.

In order to achieve communication technology that is rich and versatile, antennas need to be applied in different frequency bands. However, the space in the communication device in which the antennas are disposed is limited. Additionally, if various different types of antennas are disposed in a communication device, it is even more necessary to design the antennas to occupy less space.

Accordingly, research in various industries has been focused on ways to develop a multi-band antenna which can be applied in different frequency bands and which occupies less space.

SUMMARY

An aspect of the disclosure is to provide an antenna module which can effectively solve the aforementioned problems.

According to some embodiments of the present disclosure, a multi-band antenna includes a grounding conductor, a first radiator, and a second radiator. The grounding conductor has a grounding function. The first radiator includes a first radiating portion, a second radiating portion, and a feeding portion configured to connect to a signal source. The second radiator includes a third radiating portion, a fourth radiating portion, and a first grounding portion. A length of the third radiating portion or a length of the fourth radiating portion is longer than lengths of the first radiating portion and the second radiating portion combined, and the third radiating portion or the fourth radiating portion is radiationally coupled with the first radiating portion and the second radiating portion.

According to some embodiments of the present disclosure, the third radiating portion or the fourth radiating portion is spaced from the first radiating portion and the second radiating portion by a distance of equal to or less than 2 mm.

According to some embodiments of the present disclosure, the first radiator and the second radiator are substantially T-shaped.

According to some embodiments of the present disclosure, the multiple-band antenna further includes a third radiator. The third radiator includes a second grounding portion and a fifth radiating portion, wherein a length of the fifth radiating portion is shorter than the length of the first radiating portion or the length of the second radiating portion, and the first radiating portion or the second radiating portion is radiationally coupled with the fifth radiating portion.

According to some embodiments of the present disclosure, the first radiating portion or the second radiating portion is spaced from the fifth radiating portion by a distance of equal to or less than 5 mm.

According to some embodiments of the present disclosure, the third radiator is substantially L-shaped.

According to some embodiments of the present disclosure, the multi-band antenna further includes an inductor, and the inductor is disposed on the third radiating portion or the fourth radiating portion.

According to some embodiments of the present disclosure, the inductor is a distributed inductor.

According to some embodiments of the present disclosure, the distributed inductor is formed by a conducting wire having a wire diameter that is equal to or less than 0.5 mm.

According to some embodiments of the present disclosure, the conducting wire is formed into a rectangular shape, a circle shape, an oval shape, or a triangle shape.

It is to be understood that both the foregoing general description and the following detailed description are by examples, and are intended to provide further explanation of the disclosure as claimed.

