Four planes antenna system in use for mobile terminals in multiple input/output communication system

Abstract

Each two units of antenna are arranged in axial symmetry, that is to say each two units of antenna are arranged in left-right and upper-lower. Two units of antenna in left-right position are identical. Two units of antenna in upper-lower may be identical or different. Main radiating elements of two units of antenna in upper-lower are perpendicular to each other. Metal ground is in use for simulating metal part other than antenna in communication system, and T shape or deformation structure. T shape or deformation structure is in use for reducing cross coupling between two units of antenna in left-right. Mode for slitting metal ground is in use for reducing cross coupling between two units of antenna in upper-lower. Other structure may be adopted to reduce cross coupling further. Four units of antenna and feed line are printed on same face of PCB, and metal ground is printed on the other face. Features are: small size, low cost, easy of fabrication and integration.

Description

technical field [0001] The invention relates to a structural design of a planar four-antenna system for wireless communication, especially but not limited to a mobile terminal of a multiple-input multiple-output communication system, and belongs to the antenna design field of wireless communication technology. Background technique [0002] The rapid development and popularization of mobile communication is the most striking achievement in the process of global informatization, which greatly promotes the development of society and has a profound impact on people's way of life. In the past 20 years, mobile communication has gone through three stages from the first generation of analog communication, the second generation of digital communication and the third generation of broadband multimedia communication. The sharp increase in the number of users and the continuous increase in the amount of data exchange require an effective way to increase network capacity to meet future n...

AI Technical Summary

Problems solved by technology

In terms of size, this multi-antenna structure is more suitable for larger mobile terminals such as notebook computers, but not suitable for smaller mobile terminals such as mobile phones and personal digital assistants (PDA, personal digital assistant). In terms of structure, due to the three-dimensional structure, it is not easy to install and integrate

[0005] For small-sized mobile terminals, due to the small distance between antenna elements, the effect of space and polarization diversity is limited in the case of a large number of antennas. Usually, the mutual coupling between antenna elements (that is, the radiation of one antenna The energy is coupled to another antenna) is very large, which reduces the efficiency of the antenna, thereby reducing the capacity of the communication system

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