由于传统TEM小室的频带宽度不能满足日益增长的宽频带需求,该文采用同轴结构设计了一个DC-6 GHz的宽带电磁辐照装置。该装置基于传输线理论和阻抗匹配原理,采用锥形过渡与圆同轴连接的结构,在端口处选用N型连接器,与腔体的连接实现了良好的阻抗匹配。利用CST仿真软件进行建模优化,最后对仿真结构进行加工与调试,仿真结果表明,该同轴电磁辐照装置在DC-6 GHz频率范围内S11均在–10 dB以下,由于加工的误差测试结果在个别频点稍有偏差,但趋势和仿真结果具有较好的一致性,吻合较好,证明该辐照装置具有良好的传输性能。该文设计的同轴腔在电磁辐照系统中具有很好的应用价值。
相似文献This paper presents the design, simulation and fabrication of a miniaturized wearable dual-band antenna put on a rigid substrate and operable at 2.45/5.8 GHz for wireless local area network applications. The electrical and radiation characteristics of the developed antenna were obtained by means of the technical insertion of a slot to tune the operating frequencies. To study the impact of the electromagnetic radiation of the structure of the human body, it is necessary to minimize the back radiation towards the user. Therefore, in this work, a multi-band artificial magnetic conductor (AMC) was placed directly above a dual-band planar inverted F antenna to achieve a miniaturization with excellent radiation performance. The simulations were carried out using the computer simulation technology CST Microwave Studio (CST MWS). A good agreement was achieved between the simulation and experimental results. The comparison of the measurement findings indicates that, when the antenna was backed by the AMC plane, the gain improved from 1.84 to 3.8 dB, in the lower band, and from 2.4 to 4.1 dB in the upper band. The front-to-back ratio of the AMC backed PIFA antenna was also enhanced. Then, to ensure that the proposed AMC structure is harmless to the human body, this prototype was placed on three-layer human tissue cubic model. It was observed that, due to the inclusion of an AMC plane, the peak specific absorption rate (SAR) decreased to 1.45 and 1.1 W/kg at 2.45 and 5.8 GHz, respectively (a reduction of around 3.7 W/kg, compared with an antenna without (AMC).
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