Design Of WLAN/WiMAX SIW Multiplexer And Antenna And Divider

Along with the development of the wireless broadband and the mobile communication technology, the wireless network broadband applications are becoming more mature and popular. But, there are still some blind spots and weak areas in our daily life, for example, among some large-scale and complex-structured, building groups, there is strong attenuation of the wireless signal, but the demand for wireless networks is also stronger. Therefore, it is necessary to build a satisfactory indoor signal coverage.2.4GHz WLAN as an early-adopted frequency band has been throughout our lives; 5.25GHz WLAN has been affecting to our lives as a rising wireless technology; 3.5GHz WiMAX is a kind of broadband wireless connectivity solution which provides "the last mile service" for the enterprise and family, as a new wireless access technology Therefore, it usually requires to multiplex several signals in one road and adopt the same indoor distribution system, when building the new WLAN or WiMAX wireless network indoor distribution. The indoor distribution system mainly includes: multiplexer, indoor antenna and broadband divider, etc. The task of this paper is to design the multiplexer, the indoor antenna and the divider which be applied to the indoor distribution system in WLAN or WiMAX.In this paper, based on the structure of Substrate Integrated Waveguide, three different types of SIW band-pass filters were designed, covering the band of 2.4GHz and 3.54GHz and 5.25GHz, and then, the three band-pass filters were connected in parallel by connecting structure. According to the results of simulation, the multiplexer has good result in the pass-band and high isolation between adjacent frequencies. The antenna structure is a SIW slot antenna array and it adopts wide-brimmed migration aperture array and longitudinal seam probe coupling array. In addition, the wide-band divider was designed on the base of Y-type divider, connecting three Y-type dividers, and implement a three-road by introducing an offset short circuit.In this paper, these devices were designed by theory design combining with optimization design by electromagnetic simulation software. Besides, the designs are also verified through actual processing and testing. The test results show that the SIW multiplexer covers the band of 2.4GHz and 3.54GHz and 5.25GHz, the return-loss is more than lOdB, the isolation is more than 30dB in every frequency; The gain of the antenna is 4.79dBi in 2.4GHz WLAN and 4.09dBi in 3.5GHz WiMAX and 3.69dBi in 5.25GHz WLAN; The return loss of the divider is more than lOdB, and the power ratio approximate to 1:1:1. Above all, the designs all meet the requirements.