Journal
MATERIALS LETTERS
Volume 187, Issue -, Pages 94-97Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2016.08.100
Keywords
Magnetodielectric; Hexaferrite; Antenna substrate; Implantable medical antenna; MICS band
Funding
- National Research Foundation of Korea [NRF-2015R1A2A2A01008218]
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A magnetodielectric substrate is firstly proposed for implantable antennas in medical implant communication service (MICS) band. Ba3Co2Fe24O41 (Co(2)Z), Z-type hexaferrite flakes synthesized by molten-salt method were incorporated with a polymer matrix, having a real permeability of 2.88 and a magnetic loss of 0.029 at 402 MHz. A spiral antenna with the magnetodielectric substrate has a bandwidth 70% and 50% broader than that with a commercial dielectric substrate, Rogers 3210, in a 2/3-phantom model and a multi-layered body model, respectively. The band broadening retains the bandwidth to be overlapped after implant positions change, leading to an enhancement in insensitivity to the implant position.
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