A novel three-dimensional wideband active frequency selective surface unit-cell

2015 ◽  
Author(s):  
Suhair M. Mahmood ◽  
Tayeb A. Denidni
Keyword(s):  
Three Dimensional ◽  
Frequency Selective Surface ◽  
Unit Cell ◽  
Surface Unit ◽  
Frequency Selective ◽  
Surface Unit Cell

scholarly journals Independently Tunable Closely Spaced Triband Frequency Selective Surface Unit Cell using the Third Resonant Mode of Split Ring Slots

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Henry Fabian-Gongora ◽  
Alexander E. Martynyuk ◽  
Jorge Rodriguez-Cuevas ◽  
Lourdes Martinez-Lopez ◽  
Rosalba Martinez-Lopez ◽  
...  
Keyword(s):  
Frequency Selective Surface ◽  
Resonant Mode ◽  
Unit Cell ◽  
Split Ring ◽  
The Third ◽  
Surface Unit ◽  
Frequency Selective ◽  
Surface Unit Cell

A Third-Order Bandpass Three-Dimensional Frequency Selective Surface with Multiple Transmission Zeros

2021 ◽  
Vol 35 (12) ◽  
pp. 1548-1555
Author(s):  
Zhengyong Yu ◽  
Wanchun Tang
Keyword(s):  
Electromagnetic Coupling ◽  
Three Dimensional ◽  
Equivalent Circuit Model ◽  
Frequency Selective Surface ◽  
Unit Cell ◽  
Third Order ◽  
Transmission Zeros ◽  
Working Principle ◽  
Frequency Selective ◽  
Multiple Transmission

We present a third-order bandpass three-dimensional frequency selective surface (3D FSS) with multiple transmission zeros in this paper. The unit cell of the proposed 3D FSS consists of an air-filled square waveguide and a cuboid dielectric block with three concentric metallic square loops. Due to its inner electromagnetic coupling in the unit cell, this FSS provides a flat passband with three transmission poles, a wide out-of-band rejection with three transmission zeros, and high frequency selectivity. In order to explain the working principle, an equivalent circuit model is established and investigated. Finally, an FSS prototype is fabricated and measured, and the results exhibit good stability for both TE and TM polarizations under incident angles from 0° to 50°. Besides, this FSS has a relatively compact unit cell.

scholarly journals Optically Transparent Tri-Wideband Mosaic Frequency Selective Surface with Low Cross-Polarisation

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 622
Author(s):  
Nur Biha Mohamed Nafis ◽  
Mohamed Himdi ◽  
Mohamad Kamal A Rahim ◽  
Osman Ayop ◽  
Raimi Dewan
Keyword(s):  
Frequency Selective Surface ◽  
Performance Comparison ◽  
Unit Cell ◽  
Frequency Selective Surfaces ◽  
Transportation Services ◽  
Optically Transparent ◽  
Metallic Element ◽  
Frequency Selective ◽  
High Level ◽  
Polycarbonate Substrate

Acquiring an optically transparent feature on the wideband frequency selective surface (FSS), particularly for smart city applications (building window and transportation services) and vehicle windows, is a challenging task. Hence, this study assessed the performance of optically transparent mosaic frequency selective surfaces (MFSS) with a conductive metallic element unit cell that integrated Koch fractal and double hexagonal loop fabricated on a polycarbonate substrate. The opaque and transparent features of the MFSS were studied. While the study on opaque MFSS revealed the advantage of having wideband responses, the study on transparent MFSS was performed to determine the optical transparency application with wideband feature. To comprehend the MFSS design, the evolutionary influence of the unit cell on the performance of MFSS was investigated and discussed thoroughly in this paper. Both the opaque and transparent MFSS yielded wideband bandstop and bandpass responses with low cross-polarisation (−37 dB), whereas the angular stability was limited to only 25°. The transparent MFSS displayed high-level transparency exceeding 70%. Both the simulated and measured performance comparison exhibited good correlation for both opaque and transparent MFSS. The proposed transparent MFSS with wideband frequency response and low cross-polarisation features signified a promising filtering potential in multiple applications.

Compact Dual-Passband Three-Dimensional FSS with Good Angular Stability and Both-Side Fast Roll-Off Characteristics

2021 ◽  
Vol 36 (6) ◽  
pp. 664-669
Author(s):  
Zhengyong Yu ◽  
Baozhu Li ◽  
Shenggao Ding ◽  
Wanchun Tang
Keyword(s):  
Electromagnetic Waves ◽  
Electromagnetic Coupling ◽  
Three Dimensional ◽  
Frequency Selective Surface ◽  
Resonant Mode ◽  
Unit Cell ◽  
Angular Stability ◽  
Propagation Path ◽  
Annular Slot ◽  
Parallel Plate Waveguide

A compact dual-passband three-dimensional (3D) frequency selective surface (FSS) is proposed based on multiple square coaxial waveguides (SCWs), which exhibits good angular stability and both-side fast roll-off characteristics. The unit cell of the proposed 3D FSS is composed of one parallel plate waveguide (PPW) propagation path and two SCW propagation paths. By etching a centered annular slot, each SCW path forms two identical short SCWs. Each short SCW inherently generates one square slot resonance. In each SCW path, on the account of electromagnetic coupling between two square slot resonators provided by two short SCWs, the square slot resonant mode will split into even-/odd-resonant modes. Accordingly, each SCW path can provide a flat second-order passband with two transmission poles. Due to the reflection and out of phase of electromagnetic waves, four transmission zeros located at both sides of the passbands are introduced for high frequency selectivity, realizing both-side fast roll-off performances. In order to explain the operating principle, the electric-field distributions at transmission-zero/pole frequencies are investigated. Finally, an FSS prototype is fabricated and measured, and the results exhibit good angular stability for both TE and TM polarizations under incident angles from 0° to 60°. In addition, the proposed 3D FSS has a compact unit cell.

scholarly journals Highly-selective, closely-spaced, tri-band bandpass three-dimensional frequency selective surface

2020 ◽  
Vol 17 (13) ◽  
pp. 20200153-20200153
Author(s):  
Zhengyong Yu ◽  
Wanchun Tang ◽  
Yuehua Li ◽  
Jianping Zhu
Keyword(s):  
Three Dimensional ◽  
Frequency Selective Surface ◽  
Frequency Selective
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