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Two reader antennas, which are designed using the L-probe-fed suspended patch, are designed for the UHF band. To generate circular polarization, the Lshaped probe is modified by including an extra bend to provide one more degree of tuning freedom to the reflection coefficient without affecting the axial-ratio performance much. The proposed single-element reader antenna is able to achieve a CP bandwidth of 5.5 % (890 MHz to 940 MHz) and a maximum antenna gain of 9.7 dBi. When designed into a 22 array, the proposed reader antenna is able to produce CP bandwidth of 5.3 % (910 MHz to 960 MHz) with an antenna gain of 14.7 dBi. The read ranges of the proposed antenna and its array are 6.3 m and 10.9 m, respectively.

Circularly Polarized Suspended Patch Antenna Fed by Modified L-Probe for UHF RFID Reader