Research And Design Of 4G Antenna Based On Coplanar Technology And Functional Materials

With the rapid development of 4G communication technology in various application fields,the market also has produced great demand for the application form and different application scenes in mobile terminals.When mobile devices begin to pursue portability,the design space of antennas will be squeezed.Therefore,how to design antenna structure in a limited space that make full use of space and cover the target frequency band will be a difficult task.At the same time,interdisciplinary science is increasingly emerging.Combining functional materials with antennas will bring breakthroughs in antenna design.First,a kind of coplanar waveguide inverted F wearable antenna is designed based on latex flexible material,which covers four communication bands of LTE2300,WLAN2.4/5.2 and WiFi5.5.The antenna can also effectively cover multiple target bands under different radius of curvature and immersion.The antenna selection is simple,and the volume is small and the frequency band is wide.It is suitable for most wearable electronic devices in the future.Then,a compact multi-band microstrip patch antenna,including low-frequency GNSS that is designed by using the bidirectional coplanar structure.The antenna's radiant surface and the ground surface extend to the opposite direction respectively,turning over the antenna branches and extending the length of the extended branch to the structure covering both sides of the substrate,which makes full use of the space and increases the coupling effect.The antenna is covered by GNSS/LTE2300/WLAN2.4/5.2/ISM5.8/Wimax5.5/5G.Finally,a method of adjusting the antenna frequency band by adjusting the static magnetic field is developed.The aim is to provide a way to adjust the bandwidth of microstrip antennas through functional materials and ferrofluid loads.The antenna size is 20 x 30 x 1.6mm3,which can cover four bands of WIMAX3.5,WLAN5.2,WIFI5.5 and ISM5.8 in the process of simple regulation.This method avoids the way of broadening the antenna frequency band like most.The target frequency band will be formed at one time according to the completion of the antenna package,and there should be no two regulation.And a ultra wideband microstrip antenna for NiZn ferrite material is designed,and the microcosmic interaction between the radiant particles in the surrounding electromagnetic environment is used to change the radiation path of the antenna so as to broaden the band of the antenna.The antenna covers 2150MHz-9908MHz and has 7758MHz bandwidth.