Significantly improved near-field communication antennas based on novel Ho^(3+)and Co^(2+)ions co-doped Ni-Zn ferrites  

作　　者：Pao Yang Zhiqing Liu Hongbin Qi Xiuli Fu Zhijian Peng 

机构地区：[1]School of Science,China University of Geosciences,Beijing 100083,China [2]School of Science,Beijing University of Posts and Telecommunications,Beijing 100876,China [3]Kunshan GuoLi Electronic Technology Co.,Ltd.,Kunshan 215300,China

出　　处：《Journal of Advanced Ceramics》2024年第3期293-309,共17页先进陶瓷（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.11674035 and 61274015);the Fundamental Research Funds for the Central Universities.

摘　　要：In near-field communication(NFC)antennas,soft magnetic ferrites are usually applied as a substrate to reduce eddy current loss and increase magnetic field coupling.For this purpose,the applied ferrites are required to have high permeability and saturation magnetization together with low magnetic loss and dielectric loss.However,for most soft magnetic ferrites,it is difficult to meet all the requirements.Herein novel Ni-Zn ferrite ceramics co-doped by Ho^(3+)and Co^(2+)ions with chemical formula Ni_(0.5-x)Zn_(0.5)Ho_(0.02)Co_(x)Fe_(1.98)O_(4)(x=0-0.2)were designed and prepared to balance these needs on the basis of molten salt synthesis with metal nitrates as raw materials and potassium hydroxide(KOH)as the precipitation agent and molten salt precursor.After the substitution of Ho^(3+),the saturation magnetization and initial permeability decrease,but with further doping of Co^(2+),the saturation magnetization gradually increases,while the initial permeability continues to decrease.When x=0.1,the sample will have the lowest dielectric constant,magnetic and dielectric loss,as well as the highest Curie temperature(305℃).Moreover,the acquired Ni-Zn ferrites have been applied simulatively in NFC antennas,revealing that the device manufactured with the optimal Ni_(0.4)Zn_(0.5)Ho_(0.02)Co_(0.1)Fe_(1.98)O_(4)ferrite ceramics would have significantly improved performance at 13.56 MHz with low leakage and long transmit distance of magnetic field.Therefore,the Ni_(0.4)Zn_(0.5)Ho_(0.02)Co_(0.1)Fe_(1.98)O_(4)ferrite ceramics would be a good candidate for NFC antenna substrates.

关 键 词：electromagnetic properties CO-DOPING microstrip antennas Ni-Zn ferrite 

分 类 号：TB34[一般工业技术—材料科学与工程]