• Journal of Advanced Navigation Technology
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• v.12 no.2
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• pp.100-108
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• 2008

In this paper, the dual-ground, high-gain and broad-band internal antenna has been designed and fabricated for 4th-generation mobile communication applications. The optimized antenna was fabricated using photolithography method. The antenna consist of the patches, antenna and system ground, and a probe. The patch and ground plane were separated by air. In order to prevent the demage due to radiator swaying, the foams(${\varepsilon}_r{\fallingdotseq}1.03$) were used to fix the patches and ground. The conductor for the radiators was 0.05 [mm] thick. The measured input return loss showed less than -10 [dB] at the broadband from 3499 to 4743 [MHz]. It's measured bandwidth was 1244 [MHz]. The radiation patterns measured at 3400, 3600, 3800, 4000 and 4200 [MHz] showed Omni-directional characteristics. The gain in the E-plane and H-plane was 4.7 ~ 6.1 and 2.1 ~ 4.3 [dBi], respectively.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.3
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• pp.271-277
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• 2013

A novel approach to solve signal variation due to ship rocking in maritime wireless communication is introduced. We assume a ship-to-shore based communication scenario, where the transmitter is on shore and the receiver on the ship. Due to the ocean conditions, such as the presence of waves and wind etc. the ship is not stable and constantly experiences some form of rocking motion. This rocking motion causes the antenna on the ship to sway, creating instability in the signal reception. We envisage that the signal is offset at the receiver incurring high Bit Error Rate. This paper is to investigate and counter this problem by using Multiple-input Multiple-output (MIMO) technique. We propose to implement beamforming technique with multiple transmit antennas. The implementation of this proposed method crafts a robust maritime communication network.