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In this paper, reflector backed dipole antenna with loop-shaped parasitic elements is considered and S11 characteristic is investigated. As the results, it is confirmed that the length including dipole and parasitic elements along the dipole element is affected to the low frequency resonance and the loop peripheral length and the position of the parasitic element are affected to the high frequency...
Recently, MIMO (Multiple-Input Multiple-Output) technology is introduced in small terminals. If MIMO technology is mounted on a compact body, decoupling methods must be needed. In preceding studies, a decoupling method of 2×2 MIMO by connecting two antennas has been developed. This paper proposes a decoupling method using branch shape of 2×2 MIMO without connecting two antennas.
In this study, a quarter-wavelength additional element is applied to folded monopole antenna in order to reduce the current on the ground plane. Then, we confirm that the effective length to reduce the current is λ/4 from current distributions, and the basic performances does not change so much by adding the element.
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