The article presents an asymmetric single split resonator (ASSR) unit cell, its resonant properties, and an electrically small microwave sensor employing the complementary asymmetric single split resonator (CASSR) structure with high quality factor (Q) on the FR4 substrate. The structure is compared with the conventional symmetric split ring resonator. The CASSR sensor designed and fabricated on a substrate of dielectric constant 4.4 and a thickness 1.6 mm has an electrically small size of 0.127λ₀ × 0.127λ₀ × 0.007λ₀ at 1.27 GHz, which yields ka = 0.56 < 1 with low radiation efficiency. The properties and performance of the proposed CASSR for extracting the permittivity of both solid and liquid samples using amplitude and phase sensing in a simple lab‐in‐touch approach are validated with full‐wave simulations and experimental results.

中文翻译：

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基于互补不对称单分裂谐振器的简单电小型微波传感器，用于固体和液体的介电表征

本文介绍了一种非对称单分裂谐振器（ASSR）晶胞，其谐振特性以及在FR4基板上采用具有高质量因子（Q）的互补非对称单分裂谐振器（CASSR）结构的电小型微波传感器。该结构与传统的对称裂环谐振器进行了比较。所述CASSR传感器设计和制造介电常数4.4的衬底和1.6mm厚度具有0.127λ电学小尺寸上₀  ×0.127λ ₀  ×0.007λ ₀在1.27千兆赫，这产生か= 0.56 <1，辐射效率低。通过全波模拟和实验结果验证了所提出的CASSR通过振幅和相位传感以简单的接触实验室方法提取固体和液体样品的介电常数的特性和性能。