Circularly polarized monopole slot antenna for UHF RFID reader

Abstract

This article proposes a circularly polarized monopole slot antenna which is suitable for ultra‐high frequency (UHF) radio frequency identification (RFID) reader. In this antenna design, a meandering slot is being placed in the ground plane to produce good circularly polarized radiation characteristics, and the microstrip line feed can be adjusted to achieve good impedance matching. Measurement results showed that the 10‐dB return loss bandwidth of the antenna is 10.3% (0.857–0.95 GHz), and the 3‐dB axial ratio bandwidth of the antenna 7.4% (0.878–0.945 GHz). The maximum gain and efficiency of the antenna is 2.09 dBic and 76%, respectively. The overall antenna size is 120 × 80 × 0.8 mm3. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1102–1105, 2016

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

“…The impedance bandwidth and the maximum gain achieved by the proposed antenna is the largest among the rest, whereby the larger gain can be associated with larger ground plane. However in terms of the AR bandwidth, this work shows a greater bandwidth when compared to [22] but not [15], [16] and [21]. Even though this work has a smaller AR bandwidth, the advantage can be seen in terms of the simple design.…”

“…In [15] and [16], the antenna configurations require multiple slots in the radiating patch, in addition to needing multiple stacked elements to achieve the desired characteristics. The monopole structure in [21] has very low antenna gain. The proposed antenna is simple and cost-effective as it only involves one ground plane, one probe, and one rectangular radiating patch without needing additional slots and stacking elements to achieve high antenna gain.…”

A novel millimeter‐wave dual‐band circularly polarized dielectric resonator antenna

“…In addition, the 3D DRA structure will increase the design freedom, making it more flexible in realizing circularly polarized (CP) radiations. Moreover, the CP antennas have some advantages such as anti‐multipath effect and polarization mismatch reduction, which can reduce the polarization losses compared with the linearly polarized (LP) antenna . Thus, the research on CP DRAs becomes a hotspot .…”

“…Moreover, the CP antennas have some advantages such as anti-multipath effect and polarization mismatch reduction, which can reduce the polarization losses compared with the linearly polarized (LP) antenna. [1][2][3][4][5][6][7] Thus, the research on CP DRAs becomes a hotspot. [8][9][10][11][12] In Reference 8, the microstrip line was used to excite the dielectric resonator (DR).…”