A novel microstrip array circular polarized antenna based on t-type power divider

In underground wireless communication in the coal mines, it is necessary for antenna to have good penetration and multi-path resistance to coal dust and water mist. The circular polarization antenna has two orthogonal fields, horizontal and vertical, and the circular polarization antenna has better penetration in coal seam water mist than the linear polarization antenna under the same power. The circular polarization is divided into left rotation polarization and right rotation polarization, and the antenna can only receive signals in the same polarization direction. In the process of underground propagation, the signal is easily reflected by obstacles, changes the polarization direction, and is not received by the original polarization direction antenna. In the underground environment of the coal mine, it can be used as an effective solution to resist multi-path. An array circular polarization antenna based on T power divider and uniform rotary the feed network is proposed in this paper. The circuit structure of 16-unit micro-strip array circular polarization antenna is introduced. The structure and working principle of feed network and antenna are analyzed. Finally, simulation and experiment show that the antenna has the advantages of high front-to-back ratio, is suitable for long-distance and high orientation reading and writing applications, and is very suitable for RFID long-distance reading and writing applications in coal mine long and narrow environment. It has good application prospects and economic benefits.