Low loss Z-type barium ferrite (Co2Z) for terrestrial digital multimedia broadcasting antenna application

Magnetic properties of sol-gel and conventional ceramic processed Ba3Co2Fe2O41 hexaferrite were investigated and compared for terrestrial digital multimedia broadcasting (T-DMB) antenna application. All of the synthesized powder and sintered body showed almost single Z-phase. The loss tan delta of sol-gel processed and sintered Co(2)Z hexaferrite was 0.010 at 200 MHz, while conventional ceramic processed and sintered Co(2)Z showed 0.068. The omega(d) (resonance frequency of domain wall) and omega(s) (resonance frequency of spin components) of sol-gel and ceramic processed hexaferrites were estimated to be 10 and 1160 MHz and 17 and 1025 MHz, respectively. The frequency difference between omega(d) and omega(s) (1150 MHz) for the sol-gel processed hexaferrite is wider than that (1008 MHz) for the ceramic processed hexaferrite. The permeabilities of sol-gel and ceramic processed hexaferrites were 6.91 and 9.23 at 200 MHz, respectively. Both permeabilities are higher than 6.88 and 7.64 of corresponding permittivities at the same frequency, respectively. It is found that the sol-gel processed and sintered Z-type hexaferrite meet desired low-loss tan delta and broadband for T-DMB antenna. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3073940]