Metamaterial properties of a novel half-mode CRLH unit cell are investigated and hence a compact dual-wideband antenna is designed using an array of four unit cells. The negative refraction of the metamaterial cell is utilized to miniature the antenna. A via-free open stub, in combination with an interdigital capacitor, makes the half-mode CRLH unit cell. The proposed antenna operates at both C-band (6.2–6.8 GHz) and X-band (8.5–9.2 GHz). The dual-wideband antenna is enabled with frequency reconfigurability by incorporating RF PIN diode in its ground plane in the next design step. The ON–OFF conditions of the PIN diode electrically switch the antenna into dual-band and single-band modes, respectively. In OFF state of the diode, the antenna behaves as a monopole and operates in single-band mode resonating at C-band (5.9–6.5 GHz) only. The measured results of the fabricated sample are in good agreement with the simulated ones.

中文翻译：

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一种带有半模 CRLH 嵌入超材料臂的小型化频率可重构天线

研究了新型半模 CRLH 单元的超材料特性，因此使用四个单元的阵列设计了紧凑的双宽带天线。超材料单元的负折射用于使天线微型化。无通孔开路短截线与叉指电容器相结合，构成了半模式 CRLH 单元。建议的天线工作在 C 波段 (6.2–6.8 GHz) 和 X 波段 (8.5–9.2 GHz)。在下一个设计步骤中，通过在接地平面中加入 RF PIN 二极管，双宽带天线具有频率可重构性。PIN 二极管的 ON-OFF 条件分别将天线电切换为双频和单频模式。在二极管关闭状态下，天线表现为单极子，并在仅在 C 波段 (5.9–6.5 GHz) 谐振的单波段模式下运行。