A wideband ultrathin frequency selective surface (FSS) structure is designed and developed for the complete X‐band. The design employs a metallic tetra‐arrow (two bidirectional arrows placed diagonally) and a circular split structure (metallic) in the top side and bottom side of RT duroid 5880LZ low‐loss substrate respectively. The proposed design has novel contribution in terms of significant reduction in electrical thickness (0.007λ₀ which is corresponding to lowest operating frequency, 8.3 GHz) and wider transmission (S₂₁) bandwidth (measured: S₂₁ ≤ − 10 dB, 8.15‐13.2 GHz, 47.3%), covering entire X‐band due to cumulative loading of surface mount chip resistors in the top layer. The principle of operation of the proposed FSS further can be justified with its equivalent transmission line circuit model, which is based on microwave filter (band‐stop and band‐pass) topology for anticipating the desired characteristics. The FSS structure is further integrated with dielectric resonator (DR)‐slot hybrid antenna for enhancing the gain (measured: peak gain of 4.5 dBi without FSS and 7.8 dBi with FSS) of the antenna. The proposed FSS structure is fabricated and measured performance has very similar responses as simulated ones.

中文翻译：

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用于增强混合天线增益的超薄X波段频率选择性表面结构的设计与分析

针对整个X波段设计并开发了宽带超薄频率选择表面（FSS）结构。该设计在RT duroid 5880LZ低损耗基板的顶部和底部分别采用金属四箭头（对角线放置两个双向箭头）和圆形拆分结构（金属）。所提出的设计在显著减少方面在电厚度（新颖贡献0.007 λ ₀，其对应于最低的工作频率，8.3千兆赫）和更宽的传输（S ₂₁）的带宽（测量的：小号₂₁  ≤ - 10分贝（8.15-13.2 GHz，47.3％），由于顶层表面贴装芯片电阻的累积负载而覆盖了整个X波段。所提出的FSS的工作原理可以用其等效传输线电路模型来证明，该模型基于微波滤波器（带阻和带通）拓扑结构，可以预期所需的特性。FSS结构进一步与电介质谐振器（DR）插槽混合天线集成在一起，以增强天线的增益（测量值：不带FSS时为4.5 dBi的峰值增益，带FSS时为7.8 dBi的峰值增益）。拟议的FSS结构被制造出来，测量的性能与模拟的响应非常相似。