Mobile terminal and its antenna device

Abstract

The invention discloses a mobile terminal and an antenna assembly thereof. The antenna assembly comprises a rear cover made of a conductor and a front shell made of an insulator, the front shell is provided with a main antenna coupled with the rear cover, the front shell is further provided with at least one parasitic element which has certain distance to the main antenna, and the parasitic element is connected to the ground and is coupled with the rear cover and the main antenna respectively. Therefore, resonant frequency can be changed by adjusting the length of each parasitic element and the distance between the parasitic element and the main antenna, thereby, a frequency band range supported by the antenna is enlarged, and multi-band frequency cover is achieved. Due to the fact that the interaction effects between each two parasitic elements are not great, independent adjustment can be conducted on the frequency band one by one, thus the debugging difficulty is sharply reduced, and the antenna assembly can be applicable to terminals of various kinds; meanwhile, due to the fact that independent debugging can be conducted aiming at every frequency band, the situation of attending to one thing and losing another does not exist in the optimization process, therefore, the purpose of achieving design of maximized performance of every frequency band can be guaranteed, and the whole performance of the antenna is improved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a mobile terminal and an antenna device thereof. Background technique [0002] Because the metal casing is beautiful and firm, mobile terminals with metal casings are becoming more and more popular among users, and more and more mobile terminals currently use metal casings. In order to solve the shielding problem of the signal by the metal casing, the metal casing of the existing mobile terminal usually adopts a three-section structure (divided into upper, middle and lower sections), and the metal casing is incorporated into the antenna design as a part of the antenna. [0003] In the prior art, there are mainly two antenna design schemes for mobile terminals with metal casings: [0004] One is the direct top frame scheme. This solution directly uses the upper and lower sections of the metal back cover as the antenna feed source, which can only realize th...

AI Technical Summary

Problems solved by technology

Dual-frequency tuning with a single coupling branch is a conventional debugging solution. When it is necessary to achieve complete coverage of three frequency bands including WIFI-5G, it is necessary to continuously adjust the shape of the Pattern on the front case to "touch" a It just satisfies the scheme of three frequency bands, but in most cases, the performance of one frequency band will be sacrificed in exchange for the performance of another frequency band, so that the overall performance of the antenna is not outstanding

At the same time, it is difficult to achieve complete coverage of the three frequency bands, which makes this solution lack of inheritance. For example, the antenna solution that can achieve complete coverage on a 6-inch screen terminal may not be able to achieve complete coverage on a 5.5-inch terminal.

[0006] To sum up, the existing mobile antenna design scheme with metal casing cannot or is difficult to achieve complete coverage of the three frequency bands, the frequency range supported by the antenna is relatively narrow, and the overall performance of the antenna is not good.

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