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Compact Dual-Band Circularly Polarized Stacked Patch Antenna for Microwave-Radio-Frequency Identification Multiple-Input-Multiple-Output Application
International Journal of Antennas and Propagation ( IF 1.5 ) Pub Date : 2021-05-29 , DOI: 10.1155/2021/9991748
Enze Zhang 1 , Andrea Michel 2 , Paolo Nepa 2 , Jinghui Qiu 1
Affiliation  

A compact, low-profile, two-port dual-band circularly polarized (CP) stacked patch antenna for radio-frequency identification (RFID) multiple-input-multiple-output (MIMO) readers is proposed, which employs the shared-aperture technique. The proposed antenna adopts a 1.524 mm thickness Rogers Ro4350b substrate with relative permittivity of 3.48. Two pairs of isolated ports are working at two microwave- (MW-) RFID bands (2.4–2.485 GHz and 5.725–5.875 GHz) with high port isolation of 25 dB and 30 dB, respectively. A shared metal slot layer is designed to separate two feeding structures of the lower band and upper band for port isolation enhancement as well as saving space. Corner-truncated square slot and patch configurations have been designed to obtain CP modes. In the lower and upper MW-RFID bands, the relative impedance bandwidths are 12.2% and 5.7%, and the maximum realized gains are higher than 7.3 dBic. Moreover, two-element configurations have been combined for an RFID MIMO system that occupies a dimension of 119 mm × 119 mm × 12.9 mm. The MIMO antenna performance of envelope correlation coefficient (ECC) is lower than 0.03, and diversity gain is close to 10 dB.

中文翻译:

用于微波射频识别多输入多输出应用的紧凑型双频段圆极化堆叠贴片天线

提出了一种用于射频识别 (RFID) 多输入多输出 (MIMO) 阅读器的紧凑、低剖面、双端口双波段圆极化 (CP) 堆叠贴片天线,该天线采用共享孔径技术。建议的天线采用 1.524 mm 厚的 Rogers Ro4350b 基板,相对介电常数为 3.48。两对隔离端口在两个微波(MW-)RFID频段(2.4–2.485 GHz和5.725–5.875 GHz)下工作,端口隔离度分别为25 dB和30 dB。共享金属槽层设计用于分离下带和上带两种馈电结构,以增强端口隔离并节省空间。截角方形槽和贴片配置已设计用于获得 CP 模式。在较低和较高的 MW-RFID 频段中,相对阻抗带宽分别为 12.2% 和 5。7%,实现的最大增益高于 7.3 dBic。此外,RFID MIMO 系统采用了双元件配置,尺寸为 119 mm × 119 mm × 12.9 mm。包络相关系数(ECC)的MIMO天线性能低于0.03,分集增益接近10dB。
更新日期:2021-05-30
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