Results 71 to 80 of about 3,021 (195)

Combined Field Integral Equation Based Theory of Characteristic Mode [PDF]

, 2015
Conventional electric field integral equation based theory is susceptible to the spurious internal resonance problem when the characteristic modes of closed perfectly conducting objects are computed iteratively. In this paper, we present a combined field
Chew, Weng Cho, Dai, Qi I., Gan, Hui, Liu, Qin S.   +3 more
core   +2 more sources

An Improved Crayfish Algorithm‐Based Neural Network Method for Modeling Microstrip Patch Antennas

International Journal of Antennas and Propagation, Volume 2025, Issue 1, 2025.
Artificial neural networks (ANNs) have shown remarkable advantages in antenna modeling and optimization as surrogate models. However, in single‐objective modeling, the convergence accuracy of ANN‐based antenna models is often insufficient. This paper proposes an improved crayfish optimization algorithm (ICOA) to optimize the initial weights and biases ...
Shao-Long Cao, Yu Shao, Yang Wang, Ju Tan, Jie Zhang, Vishal Sorathiya   +5 more
wiley   +1 more source

Variable-fidelity optimization of microwave filters using co-kriging and trust regions [PDF]

, 2012
In this paper, a variable-fidelity optimization methodology for simulation-driven design optimization of filters is presented. We exploit electromagnetic (EM) simulations of different accuracy.
Couckuyt, Ivo, Dhaene, Tom, Koziel, Slawomir   +2 more
core  

Broadband Low‐RCS Linearly Polarized Metasurface–Based Antenna

International Journal of Antennas and Propagation, Volume 2025, Issue 1, 2025.
In this paper, a broadband linearly polarized (LP) metasurface (MS)–based antenna with low radar cross section (RCS) over a wideband is proposed. The radiation and scattering mechanisms of the antenna are analyzed under the guidance of characteristic mode analysis (CMA).
Jinhong Luo, Yongtao Jia, Gang Shi, Zhongxun Liu, Jiahao Zhang, Ying Liu, Venkata Kishore Kothapudi   +6 more
wiley   +1 more source

飞行器内部雷电电磁环境仿真研究

Dianci bileiqi, 2015
飞行器雷电防护的重要性不言而喻,了解其内部雷电电磁环境的分布规律有利于机舱内电子设备及线缆的合理布局。考虑直击雷引起的飞行器内部电磁环境分布情况,采用三维几何建模软件SolidWorks建立简化的机舱模型,将其导入FEKO电磁场仿真软件中。采用矩量法（MoM）对整个电磁模型进行扫频求解,将得到的频域结果在POSTFEKO模块中进行傅里叶逆变换（IFFT）得到时域结果,然后对其进行分析和讨论。结果表明,采用FEKO仿真的飞行器内部雷电电磁环境可以为飞行器防雷工程提供合理参考。
宿志国, 王万富, 张云峰, 毕庆玲, 王荣珠   +4 more
doaj  

Methods for solving incorrect tasks of electrodynamic analysis of radiating structures based on chiral metamaterials

Физика волновых процессов и радиотехнические системы, 2019
This article is devoted to the development of correct methods for electrodynamic analysis of single and multi-element radiating structures with substrates of chiral metamaterials.
A.L. Buzov, D.S. Klyuev, M.S. Kurushkin, A.M. Neshcheret, T.O. Usatenko, V.A. Kabanov   +5 more
doaj   +1 more source

A new green's function formulation for modeling homogeneous objects in layered medium [PDF]

, 2012
A new Green's function formulation is developed systematically for modeling general homogeneous (dielectric or magnetic) objects in a layered medium. The dyadic form of the Green's function is first derived based on the pilot vector potential approach ...
Chen, YP, Chew, WC, Jiang, L
core   +2 more sources

Compact Wideband Folded Dipole Antenna With a Parasitic Dipole

International Journal of Antennas and Propagation, Volume 2025, Issue 1, 2025.
A wideband folded dipole antenna with stable radiation patterns and a compact size is proposed. A folded bowtie dipole and a reflector with two vertical metal plates are applied to achieve compact dimensions. By introducing a parasitic dipole orthogonal to the folded bowtie dipole and a cylindrical substrate placed on these two dipoles, the impedance ...
Ling-Lu Chen, Lei Chang, Jian-Qiang Zhang, Trushit Upadhyaya   +3 more
wiley   +1 more source

РАДІОЛОКАЦІЙНА ПОМІТНІСТЬ БЕЗПІЛОТНИХ ЛІТАЛЬНИХ АПАРАТІВ: ПОГЛЯД КРІЗЬ ЧАСТОТНІ ДІАПАЗОНИ

Системи обробки інформації
На основі наявної 3D-моделі внутрішніх елементів безпілотного літального апарата (БпЛА) розглянуто можливість оцінки помітності радіолокації безпілотного літального апарату в дуже широкому частотному діапазоні. З цією метою побудовані математичні моделі
В.О. Василець
doaj   +1 more source

Frequency‐diverse aperture imaging using an open cavity with a rough base

IET Microwaves, Antennas &Propagation, Volume 18, Issue 12, Page 1139-1147, December 2024.
Single‐shot computational microwave imaging of a target is obtained using a frequency‐diverse aperture. Radiation from a conducting rough reflector, illuminated by an ultra‐wideband antenna provides random patterns. To obtain spatially uncorrelated near‐field scans, four conducting walls are placed around the rough surface.
Ehsan Rashidi‐Ranjbar, Jalil A. Rashed‐Mohassel, Mojtaba Dehmollaian   +2 more
wiley   +1 more source