Terminal antenna frequency band expansion structure

Abstract

The invention discloses a terminal antenna frequency band expansion structure, which comprises a metal back cover, a metal middle frame and a metal coupling piece. The metal back cover is peripherally provided with the metal middle frame. The metal back cover is separated with the top portion or the bottom portion of the metal middle frame through a gap to enable the top portion or the bottom portion of the metal middle frame to serve as an antenna radiation body, wherein the antenna radiation body is connected with a grounding point at a first position, is connected with a feeding point through an adjustable capacitor at a second position and is connected with a tuning circuit through a multipath tuning switch at a third position; and the metal coupling piece is arranged at the place of a target position around the feeding point to expand bandwidth of the antenna radiation body through coupling between the metal coupling piece and the antenna radiation body.

Description

technical field [0001] The invention relates to antenna technology, in particular to a frequency band extension structure of a terminal antenna. Background technique [0002] With the fourth generation (4G, 4 th Generation) communication technology is developing rapidly, and current mobile terminals are increasingly supporting 4G networks, such as Long Term Evolution (LTE, Long Term Evolution) networks, which require antennas to have wider bandwidths to meet user needs. On the other hand, with the further popularization of 4G terminals, the homogenization of mobile phones is becoming more and more serious, and people have higher and higher requirements for mobile phones, such as: the texture of the body, the user's online experience, etc. For this reason, many mobile phone manufacturers have launched metal models. Among them, all-metal integrated mobile phones are popular among consumers because of their beautiful appearance, high structural strength, and superior thermal ...

AI Technical Summary

Problems solved by technology

While all-metal mobile phones improve the quality and grade of mobile phones, the performance of the antenna is also reduced due to the natural signal shielding characteristics of metal. challenge

[0003] The existing antenna design for mobile terminals can achieve the bandwidth coverage of GSM800 / 900 in the low frequency band and the bandwidth coverage of DCS / PCS / UMTS / LTE2300 / 2500 in the high frequency band. However, in some application scenarios, the mobile terminal needs to further expand the frequency band to meet the needs of users. For example, the Latin American region needs a working frequency band of 700MHz. It can be seen that how to meet the structural design constraints of the mobile terminal Extending the frequency band of the antenna is an urgent problem to be solved

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