With the development of data communication and multimedia service requirements, 4G mobile communication has begun to emerge, and 4G also highlights its increasingly important position because of its ultra-high data transmission speed.

Over the past two decades, we have seen the transition from 1G to 4G LTE in mobile communications. During this period, the key technologies of communication are changing, and the amount of information processed has grown exponentially. The antenna is an indispensable component to achieve this leapfrog improvement.

According to the definition of the industry, an antenna is a kind of transformer, which transforms the guided wave propagating on the transmission line into the electromagnetic wave propagating in the unbounded medium (usually free space), or performs the opposite transformation, that is, transmitting or receive electromagnetic waves. In layman's terms, whether it is a base station or a mobile terminal, the antenna acts as a middleware for transmitting and receiving signals.

Europe released the 800MHz frequency band from January 1, 2013 North America 700MHz, 2100MHz LTE frequency band, major companies: US AT&T and Verizon, Canada Bell, Rogers and Telus, in addition to the 800MHz, 1800MHz and 2600MHz LTE frequency bands Widely used, it is said that it is very likely that the 2.6G frequency band will be unified globally first. 4 LTE licenses in Japan: NTT Docomo, SoftBank Mobile, KDDI and e-Mobile The world's first LTE commercial site: Ericsson and Swedish operator TeliaSonera China Mobile has obtained 2.6GHz FDD frequency and 30MHz 2.3G TDD frequency license in Hong Kong.

LTE commercial service countries and regions (As of January 2012, a total of 285 operators worldwide are investing in LTE in 93 countries and regions.) Armenia, Austria, Australia, Bahrain, Belarus, Brazil, Bulgaria, Canada, Denmark, Estonia, Finland, Germany, Hong Kong, Hungary, Japan, South Korea Kuwait, Tratvia, Lithuania, Philippines, Norway, Poland, Puerto Rico, Russia (launched January 15, 2012), Saudi Arabia, Singapore, Spain, Sweden, United Arab Emirates, Uruguay, United States, Uzbekistan, Taiwan.