WLAN/WiMAX Multi-frcqueney Antenna Design

With the development of modern wireless communication system.WLAN (Wireless Local Area Network, WLAN) and WiMAX (Wordwide Interoperability for Microwave Access, WiMAX) is gradually replacing the old cable Network mode, without geographical restrictions of Wireless Network mode.WLAN is flexibility, mobility, convenient installation, easy for network planning and adjustment etc, but at the same time it is also radiation range small, low speed and poor security flaws.WiMAX has the transmission distance, high speed broadband, can provide the advantages of good the last kilometer network access service, its drawback is that short of seamless switching. Combination of WLAN and WiMAX, it can obtain their respective advantages and make up their own shortcomings, and provide high-speed, high data transmission characteristics. Research, therefore, it can also work in WLAN and WiMAX spectrum of wireless communication system has a practical significance. Antenna is an important part in wireless communication system, the task of this paper is design some multi-frequency antennas can be applied to WLAN/WiMAX systemSubstrate integrated waveguide (SIW) is a kind of new guided wave structures developed in recent years, it has the advantage that the microstrip and waveguide, so this paper based on substrate integrated waveguide structure, which adopts the broad-brimmed coupling longitudinal seam offset array and longitudinal seam probe array structure respectively, designed a series SIW structure and a parallel SIW structure of WLAN (5.15～5.35GHz)/WiMAX (3.4～3.69GHz)dual-band antenna, and copper is presented in this paper for the first time the parcel method instead of the substrate integrated waveguide sidewall metallized hole array. This structure has the advantage of avoiding the waveguide side of radiation loss, convenient processing and low cost. In addition, this article also uses printing entelechy slotted structure design of the antenna and the floor is suitable for the small hand-held terminals in the two antennas, one is able to cover the WLAN (5.15～5.35GHz)/WiMAX (3.4-3.69GHz) spectrum of dual-band antenna, the other one is used in WLAN (2.4～2.484GHz and5.15～5.35 GHz)/WiMAX (3.4～3.69GHz) three frequency band antenna. Electromagnetic simulation software based on the theory and simulation optimization method of combining the design, and according to the design results, four antenna for the actual processing and testing. Test results show that this design of two dual-band SIW can cover WLAN antenna (5.15～5.35GHz)/WiMAX (3.4～3.69GHz) frequency band, and within the working frequency band, high gain, directivity, meet the design requirements; In this paper, the design of two printing entelechy antenna can cover the required band, and small size, low cost, suitable for used in small mobile handheld terminal.