In this study, fundamental characteristics of MIMO antennas are investigated using two types of folded monopole antennas (FMA) in order to cover more operational frequency bands of WiMAX. To increase the number of resonant frequencies, parasitic elements are used. As a result, one type of FMA could satisfy the two bands of WiMAX, and the other type of FMA could cover all the three bands of WiMAX with parasitic elements. Moreover, this was possible without increasing the total antenna volume. We confirmed the validity of the simulation by comparing with measured data.
A planar folded dipole antenna (PFDA) with a feed line which has approximately one-eleventh wavelength to a small terminal for WiMAX has been reported [1]. In this study, in order for MIMO to be introduced, we investigate antenna configurations of a monopole antenna and MIMO array antennas on a small ground plane. It is made clear that a monopole antenna which has about half length of PFDA with feed line can also be operated and mutual coupling of MIMO system is highly affected by an antenna configuration.
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