High-Frequency Properties and Attenuation Characteristics of WBa Hexaferrite Composites With Doping of Various Oxides

Doping of various oxides can greatly modify the high-frequency magnetic and dielectric properties and, therefore, significantly influence the impedance matching and bandwidth characteristics of BaCoZnFe
₁₆
O
₂₇
ferrite/epoxy composites. The experiments show that composites doped with V
₂
O
₅
and IrO
₂
+V
₂
O
₅
are potential candidates for use as EM attenuation materials with low reflectivity and broad bandwidth at S, C, and X microwave bands. The frequency bands for reflectivity |
R
| les -10 dB cover 3.6 - 13.7 GHz and 3.0 - 11.6 GHz at the thickness of 0.3 and 0.35 cm, and the relative bandwidth
WR
= 3.8 and 3.9 is achieved, respectively, for composites doped with V
₂
O
₅
and IrO
₂
+V
₂
O
₅
.