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Design of a hybrid A-sandwich radome using a strongly coupled frequency selective surface element
International Journal of Microwave and Wireless Technologies ( IF 1.4 ) Pub Date : 2020-02-10 , DOI: 10.1017/s1759078720000021
Krushna Kanth Varikuntla , Raghavan Singaravelu

The airborne radomes have to cater superior electromagnetic (EM) performance with bandpass characteristics of stealth application. In this regard, a hybrid A-sandwich radome is proposed in this paper. The proposed radome consists of a novel strongly coupled frequency selective surface (FSS) core sandwiched between two dielectric layers (acts as skin) to form an A-sandwich structure. The dielectric layers are cascaded in such a way that the middle layer has less dielectric parameters than the skin dielectric. The core layer comprises a modified FSS array using strongly coupled FSS layers through a series of metallic vias. This strongly-coupled FSS element will have the advantage of eliminating inter-element interference and improves the EM performance characteristics of the structure. The structure exhibits very good band-pass characteristics (>90%) at a normal impinging angle with sharp roll-off characteristics. To show the efficacy of the proposed structure, the transmission loss has been compared with that of conventional A-sandwich radomes at 0°, 50° incidence angle for both TE and TM polarization. Conformal analysis of the unit cell has been carried out, and sector-wise thickness optimization was performed to analyze the structure for the conformal shaped radome application. Finally, a physical prototype has been fabricated and measured its scattering parameters, radiation characteristics in a fully shielded anechoic chamber. The results are encouraging and prove its suitability for radome application.

中文翻译:

使用强耦合频率选择表面元件的混合 A 夹心天线罩设计

机载天线罩必须满足卓越的电磁 (EM) 性能和隐身应用的带通特性。在这方面,本文提出了一种混合A-夹层天线罩。所提出的天线罩由夹在两个介电层(充当皮肤)之间的新型强耦合频率选择表面(FSS)核心组成,以形成 A 夹层结构。介电层以这样的方式级联,即中间层的介电参数比皮肤电介质少。核心层包括一个改进的 FSS 阵列,该阵列使用通过一系列金属通孔的强耦合 FSS 层。这种强耦合FSS元件将具有消除元件间干扰的优点,并改善结构的EM性能特性。该结构表现出非常好的带通特性(> 90%)在具有急剧滚降特性的正常撞击角度。为了显示所提出结构的功效,已将传输损耗与传统 A 夹层天线罩在 0°、50° 入射角的 TE 和 TM 偏振进行比较。对晶胞进行了保形分析,并进行了扇形厚度优化以分析保形天线罩应用的结构。最后,制作了一个物理原型,并在完全屏蔽的消声室中测量了它的散射参数和辐射特性。结果令人鼓舞,并证明其适用于天线罩应用。对于 TE 和 TM 偏振,在 0°、50° 入射角时,已将传输损耗与传统 A 夹层天线罩的传输损耗进行了比较。对晶胞进行了保形分析,并进行了扇形厚度优化以分析保形天线罩应用的结构。最后,制作了一个物理原型,并在完全屏蔽的消声室中测量了它的散射参数和辐射特性。结果令人鼓舞,并证明其适用于天线罩应用。对于 TE 和 TM 偏振,在 0°、50° 入射角时,已将传输损耗与传统 A 夹层天线罩的传输损耗进行了比较。对晶胞进行了保形分析,并进行了扇形厚度优化以分析保形天线罩应用的结构。最后,制作了一个物理原型,并在完全屏蔽的消声室中测量了它的散射参数和辐射特性。结果令人鼓舞,并证明其适用于天线罩应用。已经制作了一个物理原型,并在一个完全屏蔽的消声室中测量了它的散射参数和辐射特性。结果令人鼓舞,并证明其适用于天线罩应用。已经制作了一个物理原型,并在一个完全屏蔽的消声室中测量了它的散射参数和辐射特性。结果令人鼓舞,并证明其适用于天线罩应用。
更新日期:2020-02-10
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