SAR reduction using a single SRR superstrate for a dual-band antenna
SAR reduction using a single SRR superstrate for a dual-band antenna
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DOI：
10.3109/15368378.2016.1144065
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发表时间：
2017-01-01
影响因子：
1.7
通讯作者：
Singaravelu, Raghavan
中科院分区：
文献类型：
--
作者：
Rosaline, Imaculate;Singaravelu, Raghavan
初步设计了工作在GSM 900和GSM 1800 MHz的双频微带天线。然后，一个单一的开口环谐振器（SRR）结构被用作该双频天线的覆盖层。由于垂直平面波激励，在SRR中感应出环形电流，这又导致耦合到磁共振的电激励。它还表现出在0.9和1.8 GHz的高阶激励，这最终导致在这两个设计的频率的天线在人体头部的比吸收率（SAR）的减少。天线和SRR覆板印刷在尺寸为59.6 x 49.6 mm（2）的1.6 mm厚FR-4基板上。讨论了使用经典波导理论方法分析SRR的方法。文中还讨论了在SRR覆盖物和人体头部存在时天线的辐射方向图。天线的原型沿着与SRR覆盖层制造和测量回波损耗和辐射方向图。测量结果与模拟结果吻合较好。在SAR的计算中使用了人体头部模型。
A dual-band microstrip antenna operating at GSM 900 and GSM 1800 MHz is designed initially. Then a single split ring resonator (SRR) structure is used as a superstrate for this dual-band antenna. A circular current is induced in the SRR due to the perpendicular plane wave excitation, which in turn leads to an electric excitation coupled to the magnetic resonance. It also exhibits higher order excitations at 0.9 and 1.8 GHz which ultimately resulted in specific absorption rate (SAR) reduction of human head at both the designed frequencies of the antenna. The antenna and the SRR superstrate are printed on a 1.6 mm thick FR-4 substrate of dimension 59.6 x 49.6 mm(2). Analysis of the SRR using the classic waveguide theory approach is discussed. Radiation pattern of the antenna in the presence of SRR superstrate and human head is also discussed. Prototype of the antenna along with the SRR superstrate is fabricated and measured for return loss and radiation pattern. Measurement results fairly agree with the simulated results. A human head phantom is utilized in the calculation of SAR.