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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...
A slim vertically polarized omni-directional feed circuit integrated loop slot antenna for mobile base station is proposed in this paper. Picocell antenna requires a compact and slim structure, because its construction space is limited in urban areas. The proposed antenna consists of loop slots and patches to improve omni-directional pattern and bandwidth. In order to enhance the directivity gain,...
Multi-band antenna elements consisting of a loop slot for lower-band and two slots for higher-band are designed for cellular base station antennas. This antenna is fed by Tri-plate line to eliminate feeding coaxial cables and connectors of feeding network circuits and its frequency bands are 0.8/0.9 GHz and 1.7/2.0 GHz. This paper discusses the design method of multi-band polarization diversity array...
Wide band antenna elements consisting of a loop slot and double layered parasitic patches are designed for the cellular base station antennas to cover the frequency band of 698 to 960MHz. This antenna is excited by triplate transmission line, eliminating feeding coaxial cables and connectors inside base station antenna. Low input VSWR less than 1.5 and high isolation between dual-polarization feeding...
In a handset MIMO (Multiple Input and Multiple Output) antenna, small number of elements and ports are desired. To achieve large channel capacity in above situations, adjustment of radiation patterns is important. We focus on analog techniques, and apply phase difference feeding to a handset MIMO antenna including human body effects. The phase difference is decided and fixed based on MEG (Mean Effective...
It is required to work in various surrounding environments in order that the small antennas used for mobile terminal and RFID tag are located in the vicinity of various objects including the human body and the metal. H-shaped antenna has been proposed to obtain the characteristics not to be changed by circumference environment. The H-shaped antenna has been designed by adjusting offset position and...
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