Wideband Miniaturized Antenna Based On Novel Magneto-dielectric Materials

With the rapid development of modern wireless communication technology,the research trend of novel wireless communication equipment tends to miniaturization,high integration and good performance.As a large volume and mass component in wireless communication system,antenna plays a key role in receiving and transmitting radio signals,which directly affects the performance and efficiency of the whole system.Therefore,on the premise of ensuring the performance of wireless communication equipment,the miniaturization of antenna elements is of great significance for the miniaturization and portability of the whole equipment.The main research content of this paper is to solve the bottleneck problem that the working bandwidth of microstrip antenna deteriorates when it is miniaturized.Researching the antenna materials,the miniaturization of the antenna is realized through the high dielectric constant and high permeability brought by the novel magneto-dielectric materials,and the wideband of the antenna is realized by the magnetic loss brought by the magneto-dielectric materials and the adjustment of the antenna performance.First,this paper introduces a miniaturized ultra-wideband antenna loaded with copper-clad magneto-dielectric material.By loading the magneto-dielectric material in the place where the antenna radiation is strong,the miniaturization of the antenna is effectively realized.The coupling adjustment branch structure introduced is combined to improve the impedance matching of the antenna,and the working bandwidth is further expanded.The relative bandwidth of the antenna is more than 120%,which can cover the whole world ultra-wideband wireless communication system.The antenna is single-sided printed circuit so that it is easy to process.The antenna has obvious advantages of miniaturization and its area is only 35×35mm~2.Then,based on the novel magneto-dielectric substrate,a broadband circular polarization antenna is designed for Beidou second generation satellite navigation system.The circular polarization of the antenna is realized by the asymmetric slotting of the antenna floor,and the effect of miniaturization and broadband of the antenna is significant by using the advantages of the magneto-dielectric material and the adjustment gap introduced.Finally,the impedance bandwidth of the optimized antenna reaches 43.6%(0.93-1.66 GHz),covering B1(1.559-1.592 GHz),B2(1.166-1.217 GHz),B3(1.251-1.286 GHz)and l(1.610-1.626 GHz)bands of Beidou second generation satellite navigation system,and the circular polarization bandwidth of the antenna reaches 41.3%(0.98-1.49 GHz),covering B2 and B3 bands of Beidou second generation satellite navigation system.Finally,based on RFID technology,a miniaturized circularly polarized antenna loaded with novel magneto-dielectric material is proposed.The impedance bandwidth of the antenna is190 MHz(0.831-1.021 GHz)and the relative bandwidth is 19.8%,covering the UHF RFID frequency band(860-960 MHz)all over the world.The 3d B circularly polarized bandwidth is52 MHz(892-940 MHz),and the relative bandwidth is 5.7%.It covers the commonly used UHF RFID frequency band in China(920-925 MHz).According to the application scenario in life,an RFID system is built to verify the working performance of the antenna.