A Small Meander VHF UHF Antenna by Magneto-dielectric Materials

摘要

Nowadays, new digital multimedia broadcasting services like DAB (Digital Audio Broadcasting) and T-DMB (Terrestrial Digital Multimedia Broadcasting) have been realized through VHF band and will provide large opportunities for mobile business. The antenna size for DAB/T-DMB must be too large to be assembled in mobile equipments because a quarter wavelength of VHF band in vacuum (μr=1, εr=1) is about 40cm. To solve this problem, we have developed new small antennas consist of meander conductive metal pattern and magneto-dielectric (μr=1, εr=1) layers. The ferrite resin composite material and ferrite film have been used for magneto-dielectric layers. The results of electromagnetic field simulation showed that resonant length of an antenna must be 1 / (μr x εr)~(0.5), and the resonance frequency of a magneto-dielectric antenna was about 30% of an antenna by dielectric materials.