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In diversity and MIMO applications, techniques for changing radiation patterns are required because the propagation path of a radio wave can be changed according to the time and space. In this paper, we propose a novel pattern reconfigurable antenna array with switching function of uni- and bi-directional radiation patterns. In the proposed antenna, pattern shapes and directions can be changed by...
Large channel capacity is achieved by Multi-Input Multi-Output (MIMO) technology with multi-antenna at the transmitter and receiver side, and many studies to maximize the channel capacity have been performed [1], [2]. In indoor wireless communications for small area as typified by femtocell and wireless LAN, the channel capacity has been reported to be enhanced by directional antennas and multi-polarization...
This paper presents an adaptive radiation pattern controlled antenna for handset terminals to reduce the correlation coefficient between antennas in diversity reception and to enhance the channel capacity in MIMO applications. Chip-sized analog phase shifters are introduced to control the antenna pattern to improve reception characteristics under multi-path environment. A pair of inverted-F shaped...
Under the various conditions such as the positional changes of AP and UT, aspect ratio of the room size, and radiation pattern of UT, we evaluated the channel capacity which depends on AP antenna configuration in indoor MIMO systems by the ray-tracing simulation. As a result, when radiation pattern of UT is isotropic, channel capacity enhancement by directional antennas and orthogonal polarization...
We have in this paper, reported on the investigation and validation of the existence of parasitic phase shifts. The cases of HEMT FHX35LG in [4] and E-pHEMT MGA53543 were used for validation, where in both cases; similar phase shifting behaviour was exhibited. This behaviour was exploited for a pre-liminary design of a small linear antenna array. Future work will involve array structures with more...
The quarter-wave shorted patch antenna with two parasitic elements having switch elements was proposed to control the beam profile by a simple structure. This antenna has the feature to change the radiation pattern to three directions using only four switch elements. The fabrication of the antenna using switch elements and the measurement will be left for future problem.
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