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http://dx.doi.org/10.5515/KJKIEES.2013.24.4.426

MIMO Circular Polarization Feed Network for Communication Performance Improvement of Land Mobile Satellite System  

Han, Jung-Hoon (Department of Electronic Engineering, KAIST)
Myung, Noh-Hoon (Department of Electronic Engineering, KAIST)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.24, no.4, 2013 , pp. 426-435 More about this Journal
Abstract
In this paper, we propose the MIMO circular polarization feed network to enhance the communication performances from the previous $2{\times}2$ MIMO channel to $4{\times}4$ channel for Land Mobile Satellite communication system. The only possibility to extend the communication channel is to use the additional satellite because of the limitation of satellite spaces to install additional antennas. For overcoming this problems, we propose the MIMO circular polarization feed network to secure the isolation characteristics without the distant antenna space. The port isolation characteristics and each port impedance matching conditions are numerically verified and we suggest the $4{\times}4$ MIMO channel model of the proposed system and the performances are verified. The fabricated circular polarization patch antennas with the proposed feed network are measured in the reverberation chamber and 7~10 dB of diversity gain and 80 % increasement of channel capacity are obtained.
Keywords
Land Mobile Satellite(LMS); MIMO; Feed Network; Circular Polarization;
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