Asymmetry Antenna Module Based on Two Eighth-Mode SIW Resonators for MIMO Applications

Introduction. The ever-increasing demands on the speed of information transmission lead to an increasing adoption of MIMO systems in telecommunication networks. There are a number of works devoted to the possibility of using MIMO antenna modules based on SIW resonators. One of the promising directions in this field is the use of 1/4 and 1/8 mode SIW resonators, which can significantly reduce the weight and size characteristics of the device. The main disadvantages of such MIMO antennas are the narrow frequency band and a relatively low isolation of the radiators. Therefore, the advancement of engineering approaches to designing MIMO modules that boost these attributes is a relevant research task. Aim. Development of innovative engineering approaches to designing antenna modules utilizing 1/8 mode SIW resonators for application in MIMO, which enhance their radiation properties and improve the isolation between the radiators. Materials and methods. The characteristics of the antenna module were simulated in software packages using the finite element method. The prototype antenna module was manufactured using a metallized composite polytetrafluoroethylene material. The network analyzer Ceyear 3272C was used to measure the characteristics of the antenna module prototype. Results. The MIMO module based on two 1/8-mode SAW resonators with notable improvement in both the gain of the radiation elements and their isolation was developed. The results of a study into the relationship between substrate thickness and the features of the module are presented. The possibility of using the developed module in dual-band systems by operating not only on the main, but also on the higher resonant mode of SIW resonators is demonstrated. The design of a MIMO module consisting of eight radiation elements is proposed. Conclusion. The MIMO module design based on two 1/8-mode SIW resonators separated by a gap can be used in dual-band systems operated in several modes. An increase in the substrate thickness was shown to lead to both an improvement in the module’s antenna gain and a reduction in their insulation effectiveness. An antenna module design based on a pair of 1/8-mode SAW resonators, which enables improved insulation between the radiators (up to –30 dB), is proposed.