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A simple UHF RFID circularly-polarized reader antenna is presented in this paper. Air-substrate patch antenna is used to design. Truncated patch structure and shorted posts are used to obtain circularly-polarized characteristic. Measured results show that the antenna with size of 254∗254∗18 mm, has an impedance bandwidth of 880–960 MHz for voltage standing wave ratio (VSWR) less than 1.5. Moreover,...
The demand for RFID tags has recently increased due to the development of the RFID, and the tags in UHF band are widely used with the higher read range and higher data transfer rate. In this paper, the RFID system is introduced first, in order to obtain the maximized read range, two main techniques for achieving complex impedance matching between tag antenna and IC are discussed and then an experimental...
A novel compact printed double-folded inverted-L antenna is presented. The radiator is modified from a printed inverted-L antenna by extending and folding its radiated arm. A unidirectional radiation pattern is obtained as the radiator is mounted on a vertical printed rectangular ground. A slit etched on the ground of proper length and position is used to improve antenna directivity and suppress backward...
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