We present a general approach for antenna design and optimization based on consensus of results from number independently trained deep neural networks (DNNs). The aim using the is to reduce uncertainty single DNN. leads several orders magnitude faster compared full-wave solver allows compromise between analysis speed its accuracy. used DNNs are multilayer perceptrons (MLP) with multiple fully connected hidden layers. As an example, we consider Yagi–Uda four parameters optimize it maximal...

This paper proposes a method for efficient identification of instruction-dependent sources on printed circuit board (PCB) by localizing magnetic field from limited number measurements around the PCB. We first excite processor generating an artificial leakage signal at specific frequency that is directly related to instructions. Then, we collect all three components field, but only locations edge board. Furthermore, model these and then solve forward–backward optimization problem using...

Two general approaches to multiminima optimization are considered. The first approach is based on repetition of a single minima method (e.g., the Nelder-Mead simplex applied best solution in set random trials). second coarse estimation local using initial points and starting from these search as generator optimizer). A comparison various algorithms has been done one analytical problem two well-known examples antenna design. It found that: a) enables finding more with smaller number...

This paper presents a novel formula for the complex permittivity of lossy dielectrics, which is valid in broad frequency range and ensuring causal impulse response time domain. The application this demonstrated through analysis wet soil, where coefficients are tuned to match measured data from literature. Additionally, an analytical expression relative derived. influence dependence on causality responses illustrated 1-D, 2-D, 3-D electromagnetic systems. Being most complex, system also used...

We present results for frequency-domain MoM simulations of electrically large structures using out-of-core solver accelerated with multiple GPUs on a single personal computer. The analyzed in order to demonstrate the efficiency proposed are Cassegrain reflector antenna up 240 λ diameter and Luneburg lens, 16 diameter, excited half-wavelength dipole. acceleration is 10 times one GPU compared standard CPU, or 20 when 3 GPUs.

Sintering of pure cordierite 2MgO:2Al2O3:5SiO2, and with the addition 5 mass % TeO2 was studied. Green bodies were prepared from powder mixtures mechanically activated in a high-energy planetary mill, shaped by uniaxial (20 MPa) cold isostatic pressing (1000 MPa). The pressure-less sintering these specimens performed at 1350°C for 1 h. High relative density over 95% theoretical value obtained through solid-state reaction 40 min, first time reported literature. Phase composition...

Cordierite-based ceramic materials are attracting much interest for their various applications in industry, manufacturing multilayer circuit boards, catalytic converters, filters, thermal insulation, kiln furniture, components of portable electronic devices, etc. In order to reduce production costs and modify cordierite-based materials, mechanical activation can be used. this study, microstructural electrical properties mechanically activated MgO-Al2O3-SiO2 system have been analyzed. The...

The canonical Particle Swarm Optimization (PSO) algorithm is known to be very good solution for EM optimization problems. In this paper we present results a few modifications of the PSO (Fully Informed and Repeated algorithm) when they are applied broadside antenna array. aim find out if under what circumstances these can give better than algorithm. According obtained results, well set-up (with appropriately chosen parameters), outperforms its number particles in swarm seems proportional...

An approach to singularity cancelation by a variable transformation of Green’s function in 2-D case, having log( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$R$ </tex-math></inline-formula> ) singularity, is outlined. It intended for the method moments analysis structures both curvilinear and flat cross sections. If used with Legendre or Chebyshev polynomials as entire-domain basis functions, all...

Nonuniform helical antennas have many degrees of freedom, which makes the search space for optimal design very challenging. The objective this paper is to systematically analyze nonuniform with linearly varying geometrical parameters and provide analytical equations that approximate gain designed antennas. Using various optimization algorithms, we made a large database parameters. Based on these results, These allow fast procedure yielding all necessary needed fabrication meet specified...

This paper presents optimization of a helical antenna with truncated-cone reflector. We have found that the dimensions reflector and need to be optimized simultaneously obtain optimal design. Furthermore, we can significantly increase gain compared circular or square flat A set diagrams is made enable simple design antennas reflectors. Finally, results are experimentally verified.

We present a method for identification of type and state ( <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on/off</small> ) flat-panel monitors, based on artificial neural networks measurements electromagnetic emanations in the presence real-life noise, including other monitors vicinity. The proposed approach can identify monitor with 99% accuracy (from set twelve). Instead single network, we use an ensemble independently trained multilayer...

We present the results for two different antenna optimization problems that are found using Particle Swarm Optimization (PSO) algorithm. The first problem is finding maximal forward gain of a Yagi antenna. second optimal feeding broadside array. have 6 and 20 variables, respectively. preferred values parameters PSO algorithm presented problems. show somewhat with number dimensions space. compared other algorithms, in order to estimate efficiency PSO.

Abstract We present a general method for numerical analysis of electrically large electromagnetic‐field problems, which is based on merging diakoptic approach and surface integral‐equation formulations. Compared with the classical approach, proposed provides significant reduction c.p.u. time storage, preserving high accuracy results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 931–936, 2008; Published online in InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23246

Abstract A novel, wideband, symmetrical, printed directional coupler is described, which has tight coupling and high directivity. The consists of four interconnected strips in two layers. dimensions the are optimized to minimize dispersion propagating modes. Design data provided for some typical practical cases. theoretical results verified experimentally. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2261–2267, 2012; View this article online at wileyonlinelibrary.com. DOI...

Acceleration of in-core LU decomposition by using multiple GPUs in parallel is presented this paper. Memory limitations are overcome block decomposition, where the entire system matrix stored CPU RAM, while only currently processed blocks GPU VRAM. The algorithm for enables utilization an arbitrary number GPUs. High efficiency parallelization achieved specifically tailored load balancing over most time consuming parts decomposition. Presented results show that a dense MoM with 100 000...

A new diakoptic method combining the finite-element and of moments is proposed for analysis inhomogeneous anisotropic dielectric magnetic scatterers. The splits original electromagnetic system into a number closed-region subsystems containing material complexities an open-region subsystem, which are analyzed independently. solution to problem obtained from linear relations between coefficients in expansions equivalent electric surface currents on boundary surfaces. Diakoptic sources field...

We present a relatively simple and robust algorithm for finding optimal near solutions antenna design based on combination of random Nelder-Mead simplex algorithms. considered the Yagi-Uda antenna, as an example, two reasons: it has many solutions; analysis such is quick. The presented combinations methods are optimization They can be advantageous in situations where error function (the difference between given criteria found solution) local minima approximately same depth or when...

This paper presents the results for three different antenna optimization problems that are found using particle swarm optimizer (PSO). The outcomes with PSO compared to other algorithms estimate efficiency of PSO. first problem is finding optimal position feeding probe in a radiating rectangular waveguide. second maximal forward gain Yagi antenna. third broadside array. have 2, 6, and 20 variables respectively

We investigate uniformly-wound helical antennas above ground conductors of various shapes, with aim to determine factors that improve the antenna radiation pattern and gain. show characteristics large spillover fields can be improved using (reflectors). This is achieved by intercepting unwanted redirecting it favorably. (8 pages)

A novel diakoptic method based on volume integral equation (VIE) modeling of subsystems is proposed for 3-D electromagnetic analysis. The theoretical foundation the surface and equivalence principles, as it combines VIE (SIE) formulations, in conjunction with moments (MoM). breaks original structure into a number nonoverlapping closed-region that contain inhomogeneous dielectric materials an open-region subsystem. Each subsystem analyzed completely independently applying double higher order...