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Preparing toward the new-generation communication by improving the capacity in the channel can be achieved by employing a MIMO system with polarization diversity means. This paper presents a low-profile $4 \times 4$ MIMO bidirectional antenna consisting of two composite antennas mounted on a ground plane. The composite antenna is constructed by stacking a notch antenna and a loop antenna on top...
A composite antenna of a notch antenna and a loop antenna has been developed for indoor MIMO base station. The composite antenna has dual polarized radiation patterns pointing to two different directions. The horizontally polarized wave is given by the notch element in x-axis direction while the vertically polarized wave is given by the loop element in y-axis direction. The combination of the two...
This paper presents an analysis of MIMO antennas consisting of notch antenna and loop antenna for a wide area mobile communication system with bi-directional radiation patterns. The notch antenna radiates a horizontally polarized wave while the loop antenna radiates a vertically polarized wave. The MIMO antenna is designed for 4G applications with the resonance frequency at 3.5 GHz. The antenna produces...
This paper presents a two-notch antenna cut on a small ground plane excited out of phase to a radiate horizontally polarized omnidirectional pattern. The radiating modes of this antenna is evaluated by characteristic modes analysis to obtain omni-pattern. The second mode provides a loop current in horizontal plane, radiating omni-pattern with small ripples. To improve the uniformity of pattern, this...
This paper presents two-notch antenna consisting of I-shaped ground plane and microstrip feeding lines excited out of phase. Its radiation pattern is omni- or bi-directional in E plane by changing the antenna geometry. Antenna pattern control of this notch antenna is discussed in this paper based on the geometry optimization by characteristic modes analysis. Three symmetrical modes are excited by...
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