Abstract
A novel front-end structure for ultra-high-frequency RF identification reader is proposed. The proposed front-end consists of a balanced coupler and four-port feed antenna system. The proposed balanced coupler structure has high transmit/receiver isolation feature and good insensitivity to load variations. The proposed four-port feed antenna system is applied for removing the coupling among antennas, which deteriorates the isolation. The proposed system is numerically analyzed and verified experimentally as well.
Original language | English |
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Article number | 4811950 |
Pages (from-to) | 1348-1355 |
Number of pages | 8 |
Journal | IEEE Transactions on Microwave Theory and Techniques |
Volume | 57 |
Issue number | 1 |
State | Published - Jan 2009 |
Keywords
- Antenna isolation
- Directional coupler
- Load impedance variation
- Ultra-high-frequency (UHF) RF identification (RFID)