【正文】 is the radio frequency electromagic wave or nonradiative resonant magic coupling form of power transmission. It is based on electromagic resonance coupling principle, the use of nonradiative magic field to achieve efficient power transmission. Electronics theory, when an alternating current through the conductor, the conductor around the formation of alternating electromagic fields, called electromagic waves. Electromagic wave frequencies below 100khz, the electromagic wave will be surface absorption, can not form an effective transmission, when the wave frequency is higher than 100khz, the electromagic wave can be spread in the air, and the outer edge of the atmosphere ionosphere reflection, the formation of more longdistance transmission capacity of people to more longdistance transmission of high frequency electromagic waves called radio frequency (ie: RF). The power source of information (analog or digital) with high frequency current modulation (AM or FM), the formation of the RF signal, after the antenna into the air。 Tesla (Nikola Tesla ,18561943) made outstanding contributions to electrical and radio technology. 1881 he discovered the rotating magic field principle, and for the manufacture of induction motor。 it increases the ability to signal antifading channel, changed for the better quality of wireless transmission。 on behalf of the shortrange wireless access technologies, including: WLAN, UWB. Can be divided in accordance with the mobility of mobile access and fixed access. Fixed wireless access technology: wireless access (MMDS), Local Multipoint Distribution Service (LMDS), 。 [Abstract] With the rapid development of modern science and technology to build the perfect strong and reliable munications work, has bee increasingly important. The articles bine the characteristics and needs of the electric power munications and wireless features of the new technology, analyze the application prospects of wireless munication technology in the power grid munications. First, an overview Electric power munication work is run in order to ensure the security and stability of power system came into being. With the power system security and stability control systems, dispatching automation system is collectively known as the power system security and stability of the three pillars. China39。 grid munication。s perception of the information will be easier to understand. Second, the wireless technology introduced (A) the concept of wireless munication technology Currently, wireless munications and its applications has bee one of the most active areas of research in the information science and technology today. The general by the wireless base stations, wireless terminal and application server. (B) the development status of wireless munication technology Wireless munications technology in accordance with the transmission distance can be roughly divided into the following four technology based on wireless personal area work (WPAN), wireless metropolitan area work based on wireless local area work (WLAN) based on the ( WMAN) and wireless WAN (WWAN). Overall, the representatives of the longdistance wireless access technologies: GSM, GPRS, 3G。 However, due to rainfall because the distance is usually limited to km. Works sector or base station equipment to the ATM backbone work baseband information modulated RF signal transmitted out CPE in its coverage area to receive and RF signal to restore ATM base band signal, without the need for Each user specifically laying fiber or copper, to achieve bidirectional symmetrical highbandwidth wireless transmission. (6) MMDS, technical analysis MMDS The main drawback is blocking the signal quality is vulnerable to changes in the weather, the available frequency band is not wide enough, no more than 200MHz. Second, MMDS is very strict requirements on the transmission path. The modulation technique used by MMDS phase shift keying PSK, (including BPSK, DQPSK, QPSK) and quadrature amplitude modulation QAM modulation technique, and can not do the nonlineofsight transmission is difficult to promote the use of plex urban environment. In addition, MMDS is no uniform international standards, the manufacturers of the equipment patibility issues. (G) trunking technology Digital trunking system has many advantages, its spectral efficiency has greatly improved, can further improve the user capacity of the cluster system。 and satellite munications are more suitable as emergency munications, bat munications, overseas munications. (1)Introduction Four after the 17th century discovered how to generate electricity with a metal wire transfer of power. Today, for the power grid, power lines around the world every corner. Work and life, more and more electrical appliances brought us great convenience at the same time, knew the power cord of a variety of disarray troubled by the data line is also increasing. However, all these years of technological development, the growing popularity of wireless data transmission technology, scientists have a great breakthrough in wireless power transmission (Wireless Power Transmission WPT), a sense, the wireless power transmission is no longer a fantasy get rid of the chaos of the power cord has bee possible in the future life. (2) the history of the development of wireless power transmission In the late 19th century known as usher in the power era of genius. Mingnigula 1891 invention of highfrequency transformer (Tesla Coil) are still widely used in radio, TV and other electronic equipment. He has mitted to research wireless transmission of signals and the possibility of energy in 1899 without wires using highfrequency current of the motor, but due to low efficiency and the security concerns of wireless power transmission technology breakthrough [ 1]. 1901