碩士 / 國立虎尾科技大學 / 航空與電子科技研究所 / 102 / The aim of the study is to investigate and improve the wireless communication performance inside an aircraft cabin. The electromagnetic interference path loss between inside and outside the aircraft cabin is thus studied by way of simulation and experimental measurement. Thereafter, design a planar omni-directional and circular polarization antenna to solve the problem of the multipath interference in the cabin and therefore to increase the transmission efficiency.
Based on finite-difference time-domain (FDTD) numerical method, an electromagnetic model for a small business aircraft T39-A has been built for required theoretical analysis. As the operating frequency band was set at around 330 MHz, the simulated results of electromagnetic-signal path-loss between transceivers situated at the seats in cabin and that located at the exterior fuselage is presented and discussed. In the meantime, to verify the simulation results obtained from the numerical model, a real aircraft platform has also been set up for experimental measurement. Finally, a good agreement between simulation and measurement has been obtained. Also, in this study, absorption effect of the passengers in cabin to the transmission path was examined based on a proposed numerical model.
In this investigation, it has been found that problem of the multipath interference inside cabin is relatively serious. Therefore, a planar antenna with functions of omni-direction and circular polarization (CP) was designed and used to decrease the multipath interference, thus improving the electromagnetic propagation performance. The proposed antenna is with a double-layer structure fed by a microstrip line. By carefully adjusting geometrical dimensions of the rectangle slots and the dipole elements, which are printed on the middle and lower layer, respectively, function of CP can be effectively excited. Meanwhile, another objective function, omni-directional radiation, of the designed antenna is achieved by way of tuning the rectangle patch, which is printed on the top layer. Finally, the experimentally verified CP antenna is arranged inside and outside the cabin to examine the path loss and improvement in cabin-communication efficiency has been obtained.
| Identifer | oai:union.ndltd.org:TW/102NYPI5294010 |
| Date | January 2014 |
| Creators | Kuang-Yang Chou, 周光揚 |
| Contributors | Wen-Chung Liu, 劉文忠 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 66 |
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