A Ceramic Spiral Antenna used for Modern RFID System
- 信息技术－已发表论文 
For the requirements of wideband RFID antenna, we designed a ceramic spiral antenna working at 915 MHz. The simulated results show that when VSWR (Vertical Standing Wave Ratio) is less than 2, the antenna bandwidth is up to 1.22 GHz (0.57 similar to 1.79 GHz) absolutely and to 133.21% relatively at the central frequency of 0.9 GHz. Considering engineering processes, the influence of dielectric constant epsilon(r) and thickness of circuit board are particularly studied. On this basis, a dual-frequency ceramic spiral antenna is proposed, which can work with respect to all the main frequencies of RFID system, i.e. 915 MHz and 2.4 GHz.