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It had been shown that the working gain of about 7 dBi can be realized by a three-element Yagi-Uda antenna even if the inter-element spacing is narrowed down to 0.025 wavelength, which is one-tenth of the normal interval [1]. The antenna becomes narrowband as a compensation for compactness. The narrowband is not disadvantageous for use in an inter vehicle communications system to prevent traffic accidents...
We propose a millimeter-wave antenna that can be assembled using several printed boards. A post-wall horn antenna structure and tapered slots are responsible for the narrowing of the radiation pattern in the H-plane and the E-plane, respectively. Further, to improve the matching with free space and obtain a better radiation pattern, a dielectric projection that tapers is attached to the antenna tip...
Wireless mesh ad hoc network is envisaged by us recently for maritime communications because of the lack of high-speed and low-cost communication systems in sea. A maritime simulator is developed for the purpose to simulate the sea environment and evaluate designs and protocols used in maritime mesh networks. In maritime simulator, modeling direction of arrival (DoA) of radio signal is critical since...
Abstract-The paper proposes a codebook design to support beamforming mechanism in a wide band millimeter-wave 60 GHz wireless personal area networks (60 GHz WPANs) in a realistic millimeter-wave environment. The codebooks are designed symmetrically in order to mitigate the possible beam shift due to the large differences of wave lengthes at different sub-bands of a wide band communication system....
Beam steering antenna is expected in 60 GHz wireless communication system to improve the signal to noise ratio and obtain high gain with wide cover range for high speed WPAN application. In this paper, patch antenna arrays with planar topology are investigated by synthesizing the network losses and devices such as phase shifters. The investigation results can provide a valuable guide line for the...
Implementing dynamic spectrum assignment and access technologies in heterogeneous wireless networks may lead to considerable improvement in spectrum usage and quality of service. In this paper we evaluate the performance of SINR-based dynamic spectrum assignment and access algorithms using simulation. We compare network capacity values gained using these two algorithms with the one gained using SINR-based...
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