Completely closed metal frame antenna and MIMO antenna thereof

Abstract

The invention provides a completely closed metal frame antenna and an MIMO (Multiple-Input Multiple-Output) antenna thereof. The completely closed metal frame antenna comprises a medium substrate, a completely closed metal frame surrounding the medium substrate, and an antenna portion arranged on the medium substrate. The metal frame and the medium substrate are in connection; the antenna portion is arranged in a clearance area at one end of the medium substrate and no greater than 5 mm; a non conductive portion is arranged between the metal frame and the medium substrate, allowing the non conductive portion to communicate with the clearance area. Under a small clearance condition, the antenna covers a plurality of frequency bands such as GSM, UMTS, and LTE, and the metal frame and the medium substrate do not need to be separated, allowing a complete metal housing of a communication device; the antenna is fairly firm and is easy to realize; the arranged narrow clearance area can save space; an MIMO antenna with sound isolation can be assembled under a same communication equipment cabinet only through diagonally distributing an antenna structure and without modifying the antenna structure, thereby realizing a multiple-input multiple-output function.

Description

technical field [0001] The invention relates to the field of antennas, and more specifically, to a fully enclosed metal frame antenna and a MIMO antenna thereof. Background technique [0002] In recent years, with the rapid development of wireless technology, mobile phones have gradually become the most important communication tool for the public, especially the popularization of 4G networks, which further promotes the upgrading of smart terminals. Due to the metal texture and stronger structure, the market is increasingly favoring the use of metal materials in terms of the appearance of mobile phones. At present, most mobile phones on the market use metal frames as their outer frame structure, but because metal materials have the characteristics of shielding radiation from electromagnetic waves, this also poses a greater challenge to the antenna design of mobile phones. [0003] At present, the most popular mobile phone antenna design schemes include Monopole, PIFA, Loop, ...

AI Technical Summary

Problems solved by technology

At present, there are few cases of this antenna design scheme, among which the patent: CN204481128U a mobile terminal with a fully enclosed metal frame and its LTE slot antenna and CN104022349A based on a complete frequency band smart phone antenna, although the design scheme using the slot antenna form is proposed, but The metal frame and the dielectric substrate need to be completely isolated, which makes the firmness of the mobile phone worse and the anti-drop ability becomes weaker. At the same time, this structure requires high technology and is not easy to realize. Moreover, the isolation between the antennas is poor, so it cannot Reach the design requirements of current mobile phones; In addition, the patent CN104009282A is based on a seven-band smart phone antenna with a full metal frame and CN103606736A is a new LTE antenna with a full metal frame, both of which are antenna designs proposed in a fully closed metal frame mobile phone environment, but The headroom requirements are large, and it is difficult to apply to the narrow space left for the antenna part of the current mobile phone, and the low-frequency coverage is only GSM850 / 900, which is difficult to meet the index requirements of the existing broadband design.

Therefore, it is necessary to provide a new antenna design based on a fully closed metal frame in view of the shortcomings of the current technology, such as large headroom requirements, insufficient frequency band coverage, and high process requirements.

Images