Abstract
A radio frequency identification reader antenna having multitag identification for medical systems is presented, which consists of four PIFAs, two hybrid couplers, and four power dividers. The high isolation is achieved by the symmetric design of the antenna geometry and four power dividers, which are fed by two hybrid couplers. The experimental results show an isolation of more than 40 dB in the North American (902–928 MHz), Korean (917–923.5 MHz), and Japanese (916.7–923.5 MHz) RFID frequency bands.
Highlights
Polarized (CP) reader antennas are widely used for UHF RFID systems [15,16,17,18,19,20,21,22,23]
We improved the isolation between the antennas by using two hybrid couplers and four power dividers. e proposed reader antenna covers a range of North American (902–928 MHz), Korean (917–923.5 MHz), and Japanese (916.7–923.5 MHz) RFID frequency bands and its Tx/Rx isolation is 40 dB. e multitag identification rate is compared using a far-field reader antenna (Alien reader antenna) and a near-field reader antenna (MTG reader antenna). e simulation and fine-tuning of the reader antenna were carried out by using the commercial software Ansys HFSS
Experiment Results of the Proposed Reader Antenna e proposed reader antenna design approach is verified by implementing a prototype antenna and measuring its performance. e simulation results have been obtained from commercial Ansys HFSS software to ensure that the obtained results are trustworthy. e reflection coefficient and isolation of the reader antenna were measured with an Agilent Vector Network Analyzer (85107B) in an anechoic chamber
Summary
Polarized (CP) reader antennas are widely used for UHF RFID systems [15,16,17,18,19,20,21,22,23]. E feeding structures of CP antennas can be categorized into single and multifeed. E multifeed CP antennas have wider bandwidths than single-feed structures. The multifeed CP antennas have low radiation efficiency and large size. Most of these antennas either have large antenna heights or narrow impedance bandwidths, which may not be suitable for practical applications. We present a design for a UHF RFID reader antenna having multitag identification for medical systems. We improved the isolation between the antennas by using two hybrid couplers and four power dividers. e proposed reader antenna covers a range of North American (902–928 MHz), Korean (917–923.5 MHz), and Japanese (916.7–923.5 MHz) RFID frequency bands and its Tx/Rx isolation is 40 dB. e multitag identification rate is compared using a far-field reader antenna (Alien reader antenna) and a near-field reader antenna (MTG reader antenna). e simulation and fine-tuning of the reader antenna were carried out by using the commercial software Ansys HFSS
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