For these reasons, the multi-network of stations, or even multi-operator Total Station has become a major international carriers construction. With the increased complexity of the wireless communication system, the use frequency band more, the pattern also increases. This antenna is needed to support the band, the model is also a corresponding increase in the base station antenna placement is very limited. From both network and base station location needs to become the same antenna support multi-band multi-mode inevitable choice. Shanghai Bell the RFS relevant experts also said that the biggest problem of the operators in the construction of base stations install antennas days face resource constraints, the need to use more multi-frequency antenna to replace the previous single-frequency antenna to make a limited number of days surface resources to accommodate more band. . With the 4G era, put forward higher requirements for coverage efficiency of spectrum utilization. Smart antenna technology in the 3G era, the development of an effective complement operators diversified antenna needs effectively suppress interference and improve spectrum utilization, improve system capacity. Miniaturization Huawei experts said, 2G, 3G and 4G coexistence situation 4G large-scale application, there will be quite a long time, which has caused great difficulties to the deployment of base station antenna, many sites will face can not be the new base station antenna situation. 4G era need to speed up the base station antenna to broadband, multi-frequency and multi-channel evolution process, thereby simplifying site installation, take full advantage of the site resources to adapt to the development of multi-antenna technology.