Design And Research Of Multipolar Magnetic Dipole Antenna For Internet Of Things

The antenna is the basic component of any radio system.The performance of the antenna determines whether each function can run smoothly or the system can work normally.Magneto-electric dipole antenna is a new type of bandwidth complementary antenna unit.Its outstanding advantages include wide impedance bandwidth,symmetrical pattern,low backward radiation and stable gain.Traditional single-polarized antennas that can only achieve one transmission and two receptions have been difficult to satisfy people's needs.The polarization reconfigurable antenna is unique in that they can ensure communication capacity,improve communication reliability and meet the system intelligent function.The combination of the polarization reconfigurable design and the magnetic dipole antenna can realize the advantages of the magnetic dipole antenna while also flexibly coping with various practical scenarios.With the commercialization of the fifth-generation mobile communication system and the development of the sixth-generation mobile communication system,the development of these technologies is all promoting the development of the Internet of Things.After the computer and the Internet,the third major revolution in the information industry is the Internet of Things,and this major revolution requires antennas as an important support for communication.Therefore,the Internet of Things antennas have become a hot topic in recent years.Hence,applying a multi-polarized magnetic dipole antenna to an IoT antenna is capable of expanding the communication frequency band and improving the anti-interference performance of the entire mobile communication system,which has good research values and development prospects.This article is aimed at designing and researching a multi-polarized magnetic dipole antenna suitable for the Internet of Things frequency band.Based on the realization of three polarized magnetic dipole antenna,the radiation patch part and the feed structure part of the antenna are optimized.The antenna achieves dual-frequency characteristics,and obtains the standard voltage standing wave ratio values and a stable pattern,while reducing the complexity of the antenna structure and improving the overall performance index of the antenna.Additionally,a miniaturized pointer-type one-cent-five low frequency phase shifter with filter branches is designed for the base station antenna.The low-frequency phase shifter can effectively filter out high-frequency(1710-1830 MHz)by filtering branches and can be miniaturized by using microstrip lines in the form of slow waves.The final simulation results show that in the bandwidth range(880-960 MHz),the voltage standing wave ratio of this low-frequency phase shifter is less than 1.12 and the return loss is greater than 25 dB,which satisfies the theoretical value of Chebyshev distribution and the phase requirement of 0-14° dip of the electrically tuned antenna.