Research On 4×4MIMO Antenna In Sub-6G Band For Helmet

In today's explosive growth of mobile data rate,the future of 5G is showing a very broad space for development and application prospects.As a key technology affecting the comprehensive performance of the 5th generation mobile communication system,the antenna technology for 5G application has been widely concerned by the academic and industrial circles.Among them,antenna miniaturization,broadband,multi-frequency,MIMO has been the focus of all circles.When the microwave wearable antennas are designed,the safety and convenience must be fully considered on the basis of ensuring the bandwidth and gain performance parameters.The safety refers to its small radiation back lobe,and the convenience refers to its simple structure and small size.Therefore,based on the actual industry demand and helmet application scenarios,focusing on the frequency range of 2.515GHz-2.675 GHz,taking advantage of the advantages of microstrip patch antenna,such as small size,light weight,low profile,and convenient integration with microwave circuit,starting from the three directions of broadband,miniaturization and multi-beam of antenna,with the help of electromagnetic simulation software HFSS,this thesis has designed a total of three 4×4MIMO antennas,which of the details are as follows:1.Based on the design principle of capacitive coupling feed patch antenna,a bandwidth enhanced single-layer medium plate 4×4MIMO antenna has been designed,with a size of 240mm×240mm×3mm.The airspace coverage of 90° can be achieved by tilted installation on the helmet.2.Using the metal through hole to realize the back microstrip feed,a double-layer dielectric plate 4×4MIMO antenna with short-circuit column has been designed.The size is 192mm×192mm×3.8mm,the area is smaller,and it is more flexible and convenient to install on the helmet.3.Based on the principle of Batler matrix,a double-layer dielectric plate MIMO antenna has been designed to realize two-dimensional beam scanning.The size is240mm×240mm×3mm,and a broader airspace coverage is achieved in the way of multibeam scanning.