Narrow-band frequency selective fabrics: simulation and experiment results

2019 ◽  
Vol 89 (19-20) ◽  
pp. 4272-4281
Author(s):  
Fuwang Guan ◽  
Zhaole Li ◽  
Zhuli Yang ◽  
Chuyang Zhang ◽  
Yiping Qiu
Keyword(s):  
Narrow Band ◽  
Design Method ◽  
Simulation Software ◽  
Transmission Characteristics ◽  
Transmission Method ◽  
Band Frequency ◽  
Simulation And Optimization ◽  
Simulation And Experiment ◽  
Frequency Selective ◽  
High Consistency

In this paper, frequency selective fabrics (FSFs) with narrow-band transmission characteristics were proposed. The square-ring FSF was taken as an instance to illustrate the design principle. Based on the existing theoretical basis and by means of software simulation and optimization, the optimum structures with ideal narrow-band band-stop or band-pass characteristics were obtained. Then, the practical specimens were manufactured through a computer-based carving process and measured using the transmission method in an anechoic chamber. Two structural models were respectively simulated using two different algorithms and the results showed very small differences, primarily verifying the effectiveness of the design methods and reasonability of the model simplification. The measured and simulated transmission characteristics of square-ring FSFs were compared and showed a high consistency, which further verified the validation of the design method. The other two kinds of FSFs, namely Jerusalem-shaped and circle/ring hybrid FSFs, were designed and measured, which showed the narrow-band frequency selective characteristics were quite ideal. This indicates that the proposed design method using simulation software may be applied to many different structures and has directive sense in the related product design and development process.

Transmission characteristics of cylindrical frequency selective fabrics with Jerusalem-shaped units

2019 ◽  
Vol 89 (19-20) ◽  
pp. 3960-3967
Author(s):  
Fuwang Guan ◽  
Zhaole Li ◽  
Chuyang Zhang ◽  
Zhuli Yang ◽  
Yiping Qiu
Keyword(s):  
Modeling And Simulation ◽  
Transmission Coefficient ◽  
Negligible Effect ◽  
Transmission Characteristics ◽  
Electromagnetic Parameters ◽  
Transmission Method ◽  
Simulation Process ◽  
Frequency Selective ◽  
Waveguide Method ◽  
The Ideal

Two kinds of complementary cylindrical frequency selective fabrics (CFSFs) with Jerusalem-shaped units were designed, constructed and analyzed in this paper. The models were built and simplified based on the thickness and equivalent electromagnetic parameters of the base fabrics. Considering the unit number difference of the models and bending directionality, the simulation processes were separately carried out using the waveguide method in HFSS software. Based on the preparation of preliminary planar prototypes and corresponding bending molds, different CFSF samples with the same planar units and varying bending curvature were fabricated, and the transmission characteristics were measured using the transmission method to study the influences of bending effects. The measured transmission characteristics with and without the curved mold were similar, proving the use of the curved mold exerted a negligible effect on the actual measured results of samples. For the two kinds of complementary structures, the measured and simulated S21 (transmission coefficient) curves had indistinguishable differences, which justified the validity of the modeling and simulation process. Although the bending direction and curvature affected the S21 curves of aperture and patch CFSFs at varying degrees, the transmission characteristics did not show drastic fluctuation and shifting, which could be attributed to the ideal symmetry of Jerusalem-shaped units and good array characteristics.

scholarly journals A Dual-Frequency Miniaturized Frequency Selective Surface Structure Suitable for Antenna Stealth

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Wei Zhang ◽  
Maojun Li ◽  
Mingnan Le ◽  
Bin Li ◽  
Jiaqi Wei
Keyword(s):  
Surface Structure ◽  
Frequency Selective Surface ◽  
Dual Band ◽  
Surface Element ◽  
Dual Frequency ◽  
Transmission Characteristics ◽  
Band Frequency ◽  
Unit Structure ◽  
Cell Architecture ◽  
Frequency Selective

A tiny dual-band frequency selective surface structure is proposed in this paper. With dual-band rejection characteristics at the corresponding frequency points of the S-band and C-band, suitable for antenna stealth. To achieve miniaturization, the unit-cell architecture resembles the shape of a “S.” First of all, the author describes the parameters of the surface element, and then, the transmission characteristics of the surface element are analyzed by the equivalent circuit method. By maintaining a constant response to TE and TM polarization patterns and oblique incident angles, the suggested device ensures angular independence. The measured findings from the constructed FSS are used to validate the computed results. Finally, a new unit structure is provided for the application of FSS in antenna stealth.

Angle and polarization-independent miniaturized UWB FSS design

2021 ◽  
pp. 1-9
Author(s):  
Yanning Yuan ◽  
Yuchen Zhao ◽  
Xiaoli Xi
Keyword(s):  
Design Method ◽  
Incident Angle ◽  
Stop Band ◽  
Single Layer ◽  
Wireless Systems ◽  
Frequency Selective Surface ◽  
Ultra Wideband ◽  
Band Frequency ◽  
Gain Enhancement ◽  
Polarization Independent

Abstract A single-layer ultra-wideband (UWB) stop-band frequency selective surface (FSS) has several advantages in wireless systems, including a simple design, low debugging complexity, and an appropriate thickness. This study proposes a miniaturized UWB stop-band FSS design. The proposed FSS structure consists of a square-loop and metalized vias that are arranged on a single layer substrate; it has an excellent angle and polarization-independent characteristics. At an incident angle of 60°, the polarization response frequencies of the transverse electric and magnetic modes only shifted by 0.003 f0 and 0.007 f0, respectively. The equivalent circuit models of the square-loop and metallized vias structure are analysed and the accuracy of the calculation is evaluated by comparing the electromagnetic simulation. The 20 × 20 array constitutes an FSS reflector with a unit size of 4.2 mm × 4.2 mm (less than one-twentieth of the wavelength of 3 GHz), which realizes an UWB quasi-constant gain enhancement (in-band flatness is <0.5 dB). Finally, the simulation results were verified through sample processing and measurement; consistent results were obtained. The FSS miniaturization design method proposed in this study could be applied to the design of passband FSS (complementary structure), antennas and filters, among other applications.

Numerical Simulation and Experimental Study on Water Mist Fire Suppression for Cooking Fog Discharge Pipe

2014 ◽  
Vol 915-916 ◽  
pp. 356-361
Author(s):  
Zheng Wen Xie
Keyword(s):  
Design Method ◽  
Fire Suppression ◽  
Orthogonal Design ◽  
Water Mist ◽  
Simulation Software ◽  
Droplet Radius ◽  
Test Analysis ◽  
Injection Angle ◽  
Fire Extinguishing ◽  
Flow Quantity

FDS simulation software was used to establish the full size lampblack physics model of single wind pipe, using the orthogonal design method design of analog calculation conditions, research in the nozzle pressure, the droplet radius, nozzle, flow quantity and injection angle parameters under different conditions of water mist fire extinguishing effect. Based on a full-scale combustion and water mist fire extinguishing experiment, the water mist fire suppression was observed and test analysis etc, to better understand the flue water mist fire extinguishing feasibility, provides the theory basis for the design of efficient, reliable flue fire extinguishing system.

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