A Magneto-Dielectric Handset Antenna for LTE/WWAN/GPS Applications

A compact multiband internal antenna covering LTE/GSM/GPS/DCS/PCS/UMTS bands (748-960  and 1575.42-2690 MHz) is presented for mobile terminals. The antenna combines a coupled-fed scheme and a magneto-dielectric material, which has low loss properties (magnetic loss tangent
$ < 0.08$
) up to 3 GHz, thereby achieving not only reduced antenna size but also improved bandwidth. In addition, a T-shaped monopole feeding line generating parasitic capacitance is applied to the proposed antenna. It plays an important role to shift the resonances, especially in the low band. The overall size of the antenna is only
$35 \times 15 \times 4~\hbox{mm}^{3}$
, corresponding to
$0.0875{\lambda _0} \times 0.0375\ {\lambda _0} \times 0.01\ {\lambda _0}$
(
${\lambda _0}$
is the wavelength at 750 MHz). The design process and the measured results of the proposed antenna are presented in detail.