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In order to study the coexistence between cognitive radio network and incumbent services, two representative systems of WRAN and DTV were selected. A simple interference analysis method was proposed through a coexistence scenario. Through calculation and simulation, a series of critical values were found. 8 km and 20 km of WRAN cell radius are of great significance to control the interference to DTV...
The antenna and feed networks are presented for reader applications of radio frequency identification at ultra high frequency of 840 MHz - 845 MHz and 920 MHz - 925 MHz that is allocated for RFID use in China. The antenna is composed of two dual-L antennas orthogonally placed on a ground plane. The feed networks which are used to attain circular polarization characteristics of the antenna are introduced...
The development of small integrated antennas plays a significant role in the progress of the rapidly expanding commercial RFID applications. In this paper, a planar dual-L antenna is presented for a dual-frequency band application of portable RFID reader. The antenna can be used over dual frequency of 840 MHz-845 MHz and 920 MHz-925 MHz which is allocated for RFID use in China. Simulation and measurement...
China has issued document to assign the frequency band 840~845 MHz and 920~925 MHz for RFID application on April 23, 2007. However, as the frequency 920~925MHz was originally used by stereo transmit link (STL) service, the power emitted by RFID system will probably cause interference to STL system. This paper presents the methods of conduct measurement and field test to exhibit in what condition a...
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