ABSTRACT This article presents a novel compact folded Zeroth-Order Resonant (ZOR) antenna using concept of Composite Right/Left-Handed (CRLH) transmission line operating in the WLAN/ISM bands of 2.4 and 5.2 GHz for Internet of Things (IoT) applications including USB dongle and radio-frequency identification (RFID) systems. It consists of two-unit cells of a CRLH transmission line and operates in a series resonant mode with an overall size of 1.6 mm × 38 mm × 9 mm. The measured results show that fractional bandwidths of 11.34% and 3.9% for S11 < −10 dB, and radiation efficiencies of 64.89% at 2.4 GHz and 78.88% at 5.2 GHz are obtained. A comparison between our proposed work and other existing works shows the achievement of considerable antenna miniaturization using the technique of CLRH transmission line. The measured and simulated results are generally in good consensus. Being novel and compact, the proposed design is a potential candidate for diverse IoT devices including USB dongles and low-profile RFID tags.

中文翻译：

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一种用于物联网 USB 加密狗应用的新型紧凑型折叠零阶谐振天线

摘要 本文介绍了一种新型紧凑型折叠零阶谐振 (ZOR) 天线，该天线使用复合右手/左手 (CRLH) 传输线的概念，在 2.4 和 5.2 GHz 的 WLAN/ISM 频段中运行，用于物联网 (IoT) 应用包括 USB 加密狗和射频识别 (RFID) 系统。它由 CRLH 传输线的两个单元组成，并以串联谐振模式运行，整体尺寸为 1.6 mm × 38 mm × 9 mm。测量结果表明，S11 < -10 dB 的分数带宽分别为 11.34% 和 3.9%，并且在 2.4 GHz 和 5.2 GHz 下获得了 64.89% 和 78.88% 的辐射效率。我们提出的工作与其他现有工作之间的比较表明，使用 CLRH 传输线技术实现了相当大的天线小型化。测量和模拟的结果通常具有良好的一致性。所提议的设计新颖而紧凑，是各种物联网设备的潜在候选，包括 USB 加密狗和薄型 RFID 标签。