Research And Design Of Mimo Terminal Multi-Antenna

The advantages of MIMO technology is able to increase the spectrum of wireless commu-nication systems use efficiency and channel capacity without increasing the spectrum resources and power. The MIMO antenna technique has been widely used in the base station and mobile terminal of mobile terminal equipment, But the size of space constraints, The design of MIMO antenna with low mutual coupling and low correlation is focused on the research of the MIMO antenna terminal.First of all, The microstrip structure design of a compact symmetric slotted microstrip antenna based on, Through the narrow slit and diagonal corner cutting the band-notched characteristic and circularly polarized wave radiation characteristic. The improvement of the distribution and the impedance bandwidth of current dipole microstrip structure; Design a pair of a symmetric dipole microstrip antenna based on. at the same time load coupled patch using the electromagnetic coupling principle of widening the frequency bandwidth of the antenna,The antenna achieves92%relative bandwidth. But also enhance the radiation antenna before. Therefore the design of the two antenna has a simple structure, easy processing, has good application prospect.Secondly, using the antenna array microstrip planar structure, design a mini-aturized high gain, high coverage of the MIMO antenna, the effective gain of antenna array is about17dB, and has an omni-directional radiation pattern, effectively im-proved the traditional microstrip antenna signal coverage. Polarization diversity antenna design for MIMO high isolation, its port polarization isolation can improve the MIMO antenna isolation reaches about-28dB, thus ensuring the MIMO antenna polarization isolation technique to obtain the signal low correlation, which can ensure good MIMO performance of the antenna system.Design using defected ground structure of the T-slot unit IFA antenna element antenna decoupling LC network, design a cover2.4GHz band miniature MIMO antenna, the design of T shaped groove to change the distribution of the electro-magnetic field, thus reducing the current distribution between ports, the antenna in the range of bandwidth isolation degree about-30dB. the mutual coupling of antenna significantly reduces the MIMO unit.