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首页> 外文期刊>Microwaves, Antennas & Propagation, IET >Resonantly loaded apertures for sub-diffraction near-field imaging and surface probing
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Resonantly loaded apertures for sub-diffraction near-field imaging and surface probing

机译：共振加载的光圈，用于亚衍射近场成像和表面探测

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摘要

It is demonstrated that electromagnetic (EM) transmission through a subwavelength or non-resonant aperture in a conductive screen can be significantly enhanced by loading it with folded metallic strips exhibiting resonant properties. When illuminated by an EM plane wave, these loaded apertures enable very tight, subwavelength, collimation of the EM power in the near-field zone. The authors propose quasi-planar resonant insertion geometries that should allow, for the first time, simultaneous subwavelength near field focusing of both electric and magnetic fields. The proposed technique for resonance transmission enhancement and near-field confinement forms a basis for a new class of microwave near-field imaging probe with subwavelength resolution capable of operating over a wide range of imaging distances (0.01–0.25). Measurement results demonstrate the possibility of high-contrast (more than 3 dB in amplitude and 40° in phase) near-field subwavelength imaging of active sources as well as the characterisation of planar subwavelength non-resonant dielectric targets located in free space and at the interface of moderately lossy layered media.
机译：已经证明，通过在导电屏中通过亚波长或非谐振孔的电磁（EM）传输，可以通过向其加载显示谐振特性的折叠金属条来显着增强。当由EM平面波照射时，这些加载的孔径使近场区域中的EM功率非常紧密，亚波长准直。作者提出了准平面共振插入几何形状，该几何形状应首次允许同时对亚波长的电场和磁场进行近场聚焦。所提出的用于增强共振传输和近场限制的技术构成了一种新型的亚波长分辨率的微波近场成像探头的基础，该探头能够在较宽的成像距离范围内工作（0.01–0.25）。测量结果表明，对有源源进行高对比度（振幅超过3 dB，相位超过40°）近场亚波长成像的可能性，以及表征位于自由空间和在大气中的平面亚波长非谐振介电靶的特性中等损耗分层介质的界面。

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