Compact zeroth-order resonator (ZOR) antennas
Metamaterial Electronic Device Research Center, Hongik University, Seoul 04066, Korea
2 School of Electronic and Electrical Engineering, Hongik University, Seoul 04066, Korea
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Accepted: 2 January 2019
Published online: 18 February 2019
In this paper, we introduce and review the zeroth-order resonator (ZOR) antennas with outstanding characteristics including various applications that have been researched so far. Since the zeroth-order resonance frequency is independent of a physical length of antenna, the ZOR antenna can theoretically be designed quite small and have a possibility to apply to considerably lots of applications. First, we have presented the ZOR antennas implemented by double-negative (DNG), epsilon-negative (ENG), and mu-negative (MNG) transmission lines. Then, the research related on extremely small, wide beamwidth, wideband, and circularly polarized (CP) ZOR antennas have been continuously carried out. Based on a series of these studies, the ZOR antennas were utilized for various applications such as a wireless power transfer (WPT), a compact controlled reception pattern antenna (CRPA), a penta-band mobile antenna, and a wide steering array antenna.
Key words: Double-negative (DNG) / epsilon-negative (ENG) / mu-negative (MNG) / zeroth-order resonator / circularly polarized (CP) / wide beamwidth / wideband
© J.-G. Lee and J.-H. Lee, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.