Research And Design On Repeater Antenna For Wearable Applications

The main research topic of this thesis is the wearable antenna of human body.The research and design are carried out respectively from the two directions of flexible broadband antenna and rigid repeater antenna.On the one hand,in order to meet the requirement of high-rate-data transmission and improve the anti-frequency-shift capacity of wearable flexible antenna under different body surface and conditional changes,it is very necessary to study the flexible wearable antenna with very large bandwidth.On the other hand,in order to cope with the different working environment of multi-mode and make the working modes of two frequency bands independent of each other,this paper proposes a dual-band rigid wearable repeater antenna based on multi-layer dielectric.The key works of the paper includes:(1)research and design on flexible wearable antenna.Based on the planar wideband monopole structure,two open annular slots are introduced.Under the influence of human tissue,the simulation results show that the antenna can achieve 2.75-8.31 GHz band coverage,in which the notch band covers 4.59-5.95 GHz.(2)research and design on dual-band and dual-polarized repeater antenna.The antenna is a multi-layer stacked structure,with the ground placed in the middle layer and two radiation patches placed on both sides of the ground to reduce mutual interference.Finally,the 2.45 GHz ISM frequency band used by the antenna for on-body communication can achieve 3.27%impedance bandwidth and 1.22%axial ratio bandwidth.The 5.8 GHz ISM band used for of-body communication can achieve 15.86%impedance bandwidth with omnidirectional radiation.Finally,the antenna is processed and tested to verify its performance.(3)research and design on antenna miniaturization.The size of the antenna is reduced from 29×31.3×4.8mm~3 to 24×26.3×4mm~3 by introducing a folding slot into the low-frequency patch of the dual-band and dual-polarized repeater antenna.Finally,an arm model was introduced to observe the effect of human tissue on the antenna.