Electromagnetic Performance Analysis of Graded Dielectric Inhomogeneous Streamlined Airborne Radome

Yazeen, P. S. Mohammed; Vinisha, C. V.; Vandana, S.; Suprava, M.; Nair, Raveendranath U.

doi:10.1109/tap.2017.2669718

Cited by 42 publications

(21 citation statements)

References 10 publications

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“…Verification of the EM performance analysis method can be found in [12], where the computed results are compared with the computed and measured results in [5] and [13]. In [12], the thickness is designed based on the average incident angle with a modification factor (which is for the BSE).…”

Section: Resultsmentioning

confidence: 99%

Efficient Variable Thickness Radome Design with Insertion Phase Delay Correction

Qiu

2019

International Journal of Antennas and Propagation

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Variable thickness design is capable of yielding excellent electromagnetic (EM) performance for streamlined airborne radomes. The traditional optimization method using evolutionary computation (EC) techniques can yield variable thickness radome (VTR) design with optimal EM performance but uncontrollable thickness profile, leading to manufacturing difficulties. Thickness profile design based on average incident angle is an efficient way for VTR design with smooth thickness profile, whereas the boresight error (BSE) is relatively large. In this work, insertion phase delay (IPD) correction is introduced in the efficient thickness profile design process to realize a better balance between EM performance and thickness profile smoothness of airborne radomes. The thickness profile obtained from average incident angle is adjusted for IPD distribution symmetry with respect to the antenna axis under scan angles with large BSE. Results indicate that the proposed method can effectively improve the BSE characteristics at the expense of slight deterioration of computational efficiency and thickness profile smoothness.

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Section: Resultsmentioning

confidence: 99%

Efficient Variable Thickness Radome Design with Insertion Phase Delay Correction

Qiu

2019

International Journal of Antennas and Propagation

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“…In the expression, n represents the number of vias in one unit cell and ω is the resonance frequency. The inductance (L via ) can be computed from equation (2) [28].…”

Section: Em Design Considerations Of Hybrid A-sandwich Radome Wallmentioning

confidence: 99%

“…The stable performance of radome w.r.t the angle of incidence is the most desirable characteristics of radomes. Generally, the skin layer made the constant and variable thickness of core has been used in A-sandwich radome [2]. But, in the case of the proposed coupled-FSS core, the inter-elemental capacitance will decrease with increasing substrate height.…”

Section: Thickness Optimizationmentioning

confidence: 99%

Design of a hybrid A-sandwich radome using a strongly coupled frequency selective surface element

Varikuntla

Raghavan

2020

Int. J. Microw. Wireless Technol.

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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.

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“…other radiators [3], [4]), the computational cost of EM analysis can be high. In the context of simulation-based design procedures, this may become a serious bottleneck, especially if numerous analyzes are required.…”

Section: Introductionmentioning

confidence: 99%

Antenna Modeling Using Variable-Fidelity EM Simulations and Constrained Co-Kriging

Pietrenko‐Dabrowska

Koziel

2020

IEEE Access

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Utilization of fast surrogate models has become a viable alternative to direct handling of full-wave electromagnetic (EM) simulations in EM-driven design. Their purpose is to alleviate the difficulties related to high computational cost of multiple simulations required by the common numerical procedures such as parametric optimization or uncertainty quantification. Yet, conventional data-driven (or approximation) modeling techniques are severely affected by the curse of dimensionality. This is a serious limitation when it comes to modeling of highly nonlinear antenna characteristics. In practice, general-purpose surrogates can be rendered for the structures described by a few parameters within limited ranges thereof, which is grossly insufficient from the utility point of view. This paper proposes a novel modeling approach involving variable-fidelity EM simulations incorporated into the recently reported nested kriging modeling framework. Combining the information contained in the densely sampled lowand sparsely sampled high-fidelity models is realized using co-kriging. The resulting surrogate exhibits the predictive power comparable to the model constructed using exclusively high-fidelity data while offering significantly reduced setup cost. The advantages over conventional surrogates are pronounced even further. The presented modeling procedure is demonstrated using two antenna examples and further validated through the application case studies. INDEX TERMS Antenna design, surrogate modeling, kriging interpolation, co-kriging, electromagnetic (EM) simulation.

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Electromagnetic Performance Analysis of Graded Dielectric Inhomogeneous Streamlined Airborne Radome

Cited by 42 publications

References 10 publications

Efficient Variable Thickness Radome Design with Insertion Phase Delay Correction

Efficient Variable Thickness Radome Design with Insertion Phase Delay Correction

Design of a hybrid A-sandwich radome using a strongly coupled frequency selective surface element

Antenna Modeling Using Variable-Fidelity EM Simulations and Constrained Co-Kriging

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