Low loss Co(2)Z hexaferrite with matched permeability and permittivity in HF and VHF bands
Low loss Co(2)Z hexaferrite with matched permeability and permittivity in HF and VHF bands
复制标题
低损耗 Co(2)Z 六方铁氧体，在 HF 和 VHF 频段具有匹配的磁导率和介电常数
DOI：
10.1016/j.jmmm.2015.01.086
复制
发表时间：
2015
影响因子：
2.7
通讯作者：
Li Yuanxun
中科院分区：
文献类型：
--
作者：
Zhang Tianshui;Su Hua;Tang Xiaoli;Zhang Huaiwu;Jing Yulan;Li Yuanxun
具有匹配磁导率和介电常数的磁介质材料对于天线的小型化和效率的提高具有显著的优势。在本研究中，我们采用Z型六角铁氧体系列（Ba_（0.5）Sr_（0.5））_3Co_2Fe_（24）O_（41）+x_SnO_2（其中x =0、0.1、0.2、0.4和0.6重量%）来制备磁介电材料。结果表明，适量的SnO2能明显促进铁氧体的传质和致密化，而晶粒尺寸没有明显增加，有利于获得低的磁损耗和介电损耗。但过量的SnO2会导致Co2W相的出现和烧结密度的轻微下降。当SnO2含量为0.1和0.2 wt%时，样品的折射率较高，真实的磁导率和介电常数均在15左右。前者的磁损耗和介电损耗最小，后者的磁导率和介电常数匹配最好。它们都适合3和300 MHz（HF和VHF波段）之间的天线小型化应用。
Magneto-dielectric materials with matched permeability and permittivity have significant advantages for miniaturization and efficiency improvement of antennas. In this study, we adopted the Z-type hexaferrites in series (Ba0.5Sr0.5)3Co2Fe24O41+xSnO2(wherex=0, 0.1, 0.2, 0.4, and 0.6 wt%) to produce the magneto-dielectric material. It was found that moderate SnO2could obviously enhance mass transfer and densification of the ferrites, while there was no significant increase in grain size, which favored to obtain low magnetic and dielectric losses. However, excessive SnO2led to the appearance of Co2W phase and slight decrease of sintered density. The samples with 0.1 and 0.2 wt% SnO2could obtain relatively high refractive index with real permeability and permittivity around 15. And the former presented the lowest magnetic and dielectric losses; the latter presented the best matched permeability and permittivity. Both of them are suitable for applications of antenna miniaturization between 3 and 300 MHz (HF and VHF bands).