| With the rapid development of wireless communication technology, the contradiction between the limited frequency spectrum resources and the increasing spectrum requirements becomes more and more outstanding. There is the key problems need to solved that how to make full use of the limited spectrum resources and meet the demand of the rapid growth of frequency. At present, there are some techniques used to improve the efficiency of electromagnetic spectrum. Among them, the technology of orbital angular momentum has aroused widespread academic research.The technology of orbital angular momentum enables multiple vortex electromagnetic wave signal multiplexing transmission at the same time and same frequency; this method can improve the channel capacity and spectrum efficiency. A new OAM array antenna with 8 elements is designed in this paper based on the analysis of the basic principle of orbital angular momentum, combined with the generation method of orbital angular momentum, microstrip antenna, broadband antenna technology, circular polarization technology and feed technology and other related theories. A new OAM array antenna arranged equidistantly along the circumference of the microstrip patch, and this approach allows the orbital angular momentum of technology used in the array antenna by controlling the feed phase difference between the array elements. Using ANSYSHFSS software simulation of the antenna to obtain the characteristic parameter, such as three-dimensional radiation pattern and pattern, then analysis the simulation results. Finally summarizes the full text, puts forward the further improvement proposal for the problems existing in the design, and looks forward to the development prospect of the antenna that can produce multi-mode orbital angular momentum vortex electromagnetic wave.The works of this paper are as follows,(a) Aiming at the shortage of spectrum resources in wireless communication, a new OAM array antenna with 8 elements is designed in this paper based on the analysis of the basic principle of orbital angular momentum, combined with the generation method of orbital angular momentum, microstrip antenna, broadband antenna technology, circular polarization technology and feed technology and other related theories, and it beneficial to improve the spectrum efficiency by using the electromagnetic vortex wave.(b) Aiming at the disadvantages of traditional antenna array design, this paper design of a variety of new 8 array elements electromagnetic wave microstrip array antenna, it to produce a variety of modal electromagnetic vortex wave orbital angular momentum by controlling the feed phase difference between the array elements, and the modal value respectively 1=0,l=±1,l=±2,l=±3.(c) The antenna that design in this paper can work in the popular-spectrum, such as X-band, L-band, and 2.45 GHz public spectrum. The simulation results show that the antenna can produce a variety of modal electromagnetic vortex wave orbital angular momentum, and shown good performance.(d) The antenna that design in this paper can transmit multiple signals at the same time, the same frequencies by use it in transmitting terminal for mobile communication system, and it also improve the capacity and spectrum utilization of the system. The antenna can applicable to the most popular Wi-Fi, Bluetooth band and the fifth generation of Wi-Fi technology. |
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