科研之友
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摘要
A form of a novel adaptive antenna system that combines radio frequency identification (RFID) technology, programmable intelligent computer (PIC) microcontroller and reconfigurable beam steering antenna is proposed. Localization and adaptive response are the most challenging issues in smart antenna system. In this research, the localization technique relying on the received signal strength (RSS) signals has been done intensively where the capability of the RFID tag in producing certain level of signal strength has been exploited as a stimulator for the system to adaptively activate certain PIN diode switches of reconfigurable beam steering antenna. It is found that the detecting ability of the RSSI signals is extremely influenced by the 45 degrees angle of the RFID reader's directive antenna. The combination of four 90 degrees triangles which have 'adjacent' and 'opposite' angle of 45 degrees forming pyramid antenna which has four sections; 1, 2, 3 and 4 enable the RFID readers to receive the RSS signals from the angles of 0 degrees/360 degrees, 90 degrees, 180 degrees and 270 degrees respectively. When the RFID tag is directly facing a certain section, certain RSS signals will 'flow' from a particular section into their respected RFID readers to automatically detect the range and angles' location of the RFID tag through the input ports of PIC microcontroller. A1, A4, C4 and C7. The PIN diode switches of the reconfigurable beam steering antenna are then activated by the output ports of PIC microcontroller. It is found that the Ground Reflection (Two-Ray) propagation model is very crucial in determining the projection and height of reconfigurable antenna to efficiently cover the scattered measurement points of 1 up to 10 at four angles with difference rages of distance. The proposed antenna has a great potential in realizing the new smart antenna system replacing the conventional and Wimax application.
- 出版日期2010
