Novel Design Method for Grading Honeycomb Radar Absorbing Structure Based on Dispersive Effective Permittivity Formula

Zhao, Yuchen; Liu, Jiangfan; Zhang, Song; Xi, Xiaoli

doi:10.1109/lawp.2016.2632819

Cited by 17 publications

(14 citation statements)

References 15 publications

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“…A novel design approach has been developed for coating thickness optimization of graded honeycomb RAS using dispersion effective permittivity formula by Zhao et al . The detailed study also includes thickness required, fractional bandwidth, and relation between thickness and bandwidth, and so on.…”

Section: Introductionmentioning

confidence: 99%

“…Complete EM characterization was done using techniques similar to radar cross section (RCS) measurements using anechoic chamber with plane wave incident wave. 31 A novel design approach has been developed for coating thickness optimization of graded honeycomb RAS using dispersion effective permittivity formula by Zhao et al 32 The detailed study also includes thickness required, fractional bandwidth, and relation between thickness and bandwidth, and so on. The optimized design further validated through experiments and achieved a good match among both.…”

Section: Introductionmentioning

confidence: 99%

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Polymer matrix composites as broadband radar absorbing structures for stealth aircrafts

Jayalakshmi

Inamdar

Anand

et al. 2018

J of Applied Polymer Sci

132

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Stealth or low observable technology has been one of the most critical requirements for military aviation sector to counter the ever‐advancing target detection technologies worldwide. Among many, Radar, which operates in the broadband spectrum, is one of the principal threats, which measures the radar cross section (RCS) of the aircraft. Hence, researchers are putting immense efforts to develop low RCS materials based on polymer matrix composites (PMCs) called as radar absorbing structures (RAS), to replace highly reflective conventional metallic aircraft structures. Though many researchers have been successful in RAS realization using radar absorbing materials (RAMs) as fillers, this review article reckons the state‐of‐the‐art advanced research on the realization of RAS using a combination of RAMs and multilayered grid devices such as, frequency selective surfaces, circuit analog absorbers, metamaterials, and so on, and their effect on mechanical properties to deliver superior performance RAS for stealth aircrafts. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47241.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polymer matrix composites as broadband radar absorbing structures for stealth aircrafts

Jayalakshmi

Inamdar

Anand

et al. 2018

J of Applied Polymer Sci

132

View full text Add to dashboard Cite

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“…Recently, the graded design of the coating thickness of the honeycomb RAS was reported in [31, 32]. Then, we presented a novel design method for their graded idea based on our dispersive closed-form expression for the effective permittivity of the honeycomb RAS [33]. In this study, the dispersive effective permittivity formula can reduce the computational error of reflectivity by approximately 75%, and the optimizer with a normal incident objective function for wide-band application is utilized to achieve a fractional bandwidth of 141.2%, i.e., 3.1–18 GHz, for at least a 10 dB reflectivity reduction.…”

Section: Introductionmentioning

confidence: 99%

“…A good agreement between the calculated, simulated, and measured data demonstrates the validity of the optimization results. In addition, although there have not been much geometric differences between the proposed configuration and that presented in [33] due to the very limited design variable database, the choice of an objective function that takes both the bandwidth and incident angle into account improves the oblique incident performance of graded honeycomb RAS. More importantly, a comprehensive comparison between different optimization results reveals that the combination of a proper objective function and a smart coating approach produces the best honeycomb RAS, but if one has to make a choice, a better coating technique will improve the performance of the honeycomb RAS more effectively.…”

Section: Introductionmentioning

confidence: 99%

Design of graded honeycomb radar absorbing structure with wide-band and wide-angle properties

Zhao

Ren

et al. 2018

Int. J. Microw. Wireless Technol.

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In this paper, the design of a graded honeycomb radar absorbing structure (RAS) is presented to realize both a wide bandwidth and absorption over a wide range of angles. For both transverse-electric and transverse-magnetic polarization, a fractional bandwidth of more than 118.6% is achieved for at least a 10 dB reflectivity reduction when the incident angle is <45°, an 8 dB reduction when the incident angle is <55° and a 5 dB reduction when the incident angle is <70°. Meanwhile the 10 dB reduction upper angle limit is approximately 30° for the uniform coating honeycomb RAS in the literature, which loses its absorbing ability when the incident angle is larger than 55°. Furthermore, the total thickness of our design is 10.7 mm, which is only approximately 1.29 times that of the theoretical limitation. The good agreement between the calculated, simulated, and measured results demonstrates the validity of this optimization.

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“…4.4, which shows the relation between the wavenumber and the frequency. The EM wave is prevented in the unit cell The permittivity and permeability of the material can be derived from the simulated transmission and reflection coefficients of one unit cell [62,63]. The simulated unit cell and ports are indicated in Fig.…”

Section: Discussionmentioning

confidence: 99%

Improvement of antenna performances by using ferrites and periodic structures

Mi¹

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This thesis investigates various methods to improve the performances of antennas. For different applications, the antennas are expected to have corresponding performances and characteristics. The efficiency is one of the most important parameters that should be considered, and the losses determine the efficiency directly. For different types of antennas operating in different frequency bands, there exist different factors which influence the performances. For example, in the HF band (3 MHz-30 MHz), the performances depend on the mismatch loss and the size of the antenna. In the microwave frequency band, besides the mismatch loss, the dielectric loss of the substrate material is also one of the most important factors. Whereas in the millimeter wave frequency band, the loss in the feeding network is the factor that limite antenna gain and efficiency when the sub-antennas are all matched well. Considering various influence factors, different techniques and methods are investigated to improve the performances. First, the compact and effective ferrites are selected to improve the performances of the HF antennas. Effective methods of using ferrites are proposed to improve the performances of the HF antenna. By analyzing the current in the ground plane of the antenna, the

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Novel Design Method for Grading Honeycomb Radar Absorbing Structure Based on Dispersive Effective Permittivity Formula

Cited by 17 publications

References 15 publications

Polymer matrix composites as broadband radar absorbing structures for stealth aircrafts

Polymer matrix composites as broadband radar absorbing structures for stealth aircrafts

Design of graded honeycomb radar absorbing structure with wide-band and wide-angle properties

Improvement of antenna performances by using ferrites and periodic structures

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