Wideband circularly polarized antennas with wide axial-ratio (AR) bandwidth and required gain are desired for point-to-multipoint communication and remote tracking applications. Two different designs of probe-fed rectangular curved slotted dielectric resonator antenna (SDRA) models are proposed in this article, one with an overall size of 50 ? 50 mm2 (SDRA-1) and the other a scaled-down version with 25 ? 25 mm2 (SDRA-2). Axially symmetric rectangular curved slots are introduced in cylindrical dielectric resonator antennas (CDRAs) to create asymmetry in the structure for circular polarization (CP). The proposed SDRA-1 offers a wide impedance bandwidth of 55% (4.14-7.31 GHz) and a 3-dB AR bandwidth of 38% (4.82-7.07 GHz) with a minimum AR value of 0.1 dB. The peak gain obtained for SDRA-1 is 6 dBi. A scaled-down version of the dielectric resonator antenna (DRA) provides an impedance bandwidth of 57.5% (7.34-12.94 GHz), a 3-dB AR bandwidth of 0.76 GHz, and a peak gain of 5.52 dBi. The proposed DRA models are suitable for IEEE wireless standard 802.11ac Wi-Fi (5 GHz), IEEE 802.11a (5.2 GHz), IEEE 802.16d worldwide interoperability for microwave access (WiMax) and x-band applications.

中文翻译：

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具有矩形弯曲槽的宽带圆极化圆柱形介质谐振器天线 [天线应用专区]

点对多点通信和远程跟踪应用需要具有宽轴比 (AR) 带宽和所需增益的宽带圆极化天线。本文提出了两种不同设计的探头馈电矩形弯曲开槽介质谐振器天线 (SDRA) 模型，一种总尺寸为 50 ? 50 mm2 (SDRA-1) 和另一个缩小版本 25 ? 25 平方毫米 (SDRA-2)。在圆柱形介质谐振器天线 (CDRA) 中引入了轴对称矩形弯曲缝隙，以在圆极化 (CP) 结构中产生不对称性。建议的 SDRA-1 提供 55% (4.14-7.31 GHz) 的宽阻抗带宽和 38% (4.82-7.07 GHz) 的 3-dB AR 带宽，最小 AR 值为 0.1 dB。SDRA-1 获得的峰值增益为 6 dBi。介电谐振器天线 (DRA) 的缩小版本提供 57.5% (7.34-12.94 GHz) 的阻抗带宽、0.76 GHz 的 3 dB AR 带宽和 5.52 dBi 的峰值增益。提议的 DRA 模型适用于 IEEE 无线标准 802.11ac Wi-Fi (5 GHz)、IEEE 802.11a (5.2 GHz)、IEEE 802.16d 全球微波接入互操作性 (WiMax) 和 x 波段应用。