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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...
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...
As a fundamental study of the helmet antenna for disasters operated at 150 MHz, a circular planar folded dipole antenna has been examined. To begin with the helmet antenna structure is constituted by bending a dipole antenna into the shape of the circle on the plane for simplicity. As a result, it is made clear that adjusting the impedance of the helmet antenna is possible by changing the distance...
Planar folded dipole antenna (PFDA) with feed line which is approximately quarter wavelength has been reported [1]. However, the feed line is too long to be mounted on a small terminal. In this paper, in order to amount the antenna to a small terminal for WiMAX, we investigate miniaturization of the feed line and characteristics of the antenna on the small ground plane (50 mm×80 mm). The planar folded...
It has been reported that bow-tie antenna can be miniaturized by adding two folded elements to bow-tie antenna. But the antenna has VSWR degradation problem. The degradation is caused by a resonant condition on the folded element. We propose a use of additional elements in order to obtain more wideband bow-tie antenna with folded elements. We can suppress the degradation of VSWR characteristic while...
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