Carbon fabric composite is used in technical applications such as aircrafts which electromagnetic shielding (electromagnetic interference–shielding effectiveness) required. Traditionally, metallic coatings or metal plates are for shielding, however, conductive filler-filled also alternative to sheets due its light weight. In the literatures, there studies about effect carbon nanotube and graphene oxide flakes on interference; no encountered that search of nanotube/graphene fiber alignment...

A wideband multiple input output (MIMO) antenna was designed and fabricated for a wireless device at the operating frequency bands 2.1/2.3/2.6 GHz LTE 2.4GHz Wi-Fi. The MIMO has single element with quad-ports portable devices. involves symmetrical four port microstrip feedline monopole patch radiating component frame-shaped partial ground plane. modeled simulated using CST's simulation software then prototype measured. results indicated that measurement were found to be in reasonably fair...

In the recent years, microstrip antennas have quickly developed from a research novelty to practical reality, with applications in wide range of communication systems that must thank their numerous appreciated features. The present work proposes low nature slotted antenna ground plane structure for Ku-band satellite communications. Firstly, single patch designed and then 2×2 array modelled simulated by using Ansoft HFSS 3D electromagnetic simulation tool. High directivity has been realized...

A novel triple-band frequency selective surface (FSS) as a band stop filter in Global System for Mobile communication (GSM) frequencies is presented. Unit cell of the FSS consists two isolated resonators, one square loop resonating at 942 MHz and another synthetic resonator same layer having resonant 1842 2142 MHz. The similar geometries which are coupled to each other by slim gaps way that resonance arises through joint lengths both geometries. Therefore, these dependent resonators simply...

In this study, the Ground Penetrating Radar (GPR), which is a geophysical prospecting method for shallow-depth research, applied on cylindrical objects in order to extract information about their internal structures. first step, two different models containing cavities and filling material are designed programmatically. These then used compute theoretical radargram images using "gprMax" program, simulating electromagnetic (EM) waves' propagation through modelled media. Next, GPR actual media...

In this paper, maximum likelihood estimator is proposed for passive localization of narrowband sources in the spherical coordinates (azimuth, elevation, range). We adapt expectation/maximization iterative method to solve complicated multi-parameter optimization problem appearing on 3-D problem. The algorithm based criterion, which employs source signals recorded by 2-D array under near-field assumption. Expectation/maximization decomposes observed data into its components and then estimates...

Class-F type amplification stands on proper termination of harmonics such as short for even and open odd harmonics. Moreover, only the first few is practical high-frequency circuits, while obtaining satisfactory terminations at high frequencies a challenging design issue. In present study, topology load network with 2nd 3rd its relative analytical analysis are presented. The proposed output structure provides an improved harmonic; therefore, efficiency power amplifier increases. addition,...

Since maximum likelihood (ML) approaches have better resolution performance than the conventional localization methods in presence of less number and highly correlated source signal samples low to noise ratios, we propose unconditional ML (UML) method for estimating azimuth, elevation range parameters near-field sources 3D space this paper. Besides these superiorities, stability, asymptotic unbiasedness, minimum variance properties are motivated application approach. Despite advantages,...

This article presents both a four-element novel microstrip array antenna and low noise amplifier (LNA) for Ku-band small satellite receiver. It includes all design details with measurement results of the fabricated LNA. Measured minimum maximum gains proposed are 10.1 10.9 dBi in 11.9-12.9 GHz band frequency. The designed LNA has figure lower than 1.5 dB gain higher 8 (at 2 V, 10 mA biasing). In order to reduce period cost, discrete components chosen hetero-junction FET is used as active...

An attractive approach to design antenna arrays with minimum sidelobe level is based on the binomial expansion, and they are referred as arrays. In fact, element spacing equal or less than λ/2 have no minor lobes. However, there compact expressions available obtain directivity of restriction in spacing, except when λ/2. This letter proposes a expression for array number elements. The procedure properties Pascal's triangle. Then, factor calculated by using Fourier transform.

Abstract In this study, the electromagnetic scattering from a high‐order inhomogeneous impedance cylinder is investigated. The method presented in paper based on series representation of incident and fields. inhomogeneous‐surface functions are also expressed by terms Fourier series. By using boundary condition surface cylinder, equation obtained. This reduced matrix orthogonal properties expansion unknown mode coefficients can be calculated. obtained results compared with those moments (MoM)...

Article The Effects of Frequency, Polarization, Direction and Metallic Objects on the SAR Values in a Human Head Model for Plane Wave Exposure (500-2500 MHZ) was published December 1, 2006 journal Frequenz (volume 60, issue 11-12).

In this paper, external electric field values that are derived from the largest peak average 10 g SAR (Specific Absorption Rate) results in a realistic human head model compared with current IEEE and ICNIRP reference levels. The is illuminated by plane wave source at seven different frequencies ranging 500 MHz to 2500 MHz, five incident directions three polarizations. Results reveal presence of metallic wire spectacles reduces levels region above 900 MHz. Comparison shows safety limits...

In this study, terbium-doped NiFe2O4 was produced by using mixed oxide technique. The Ni1-xTbxFe2O4 composition synthesized and x selected as 0.025, 0.050 0.070, respectively. single phase Ni ferrite after sintering at 1250 °C for 4 h. X-ray diffraction (XRD), scanning Electron Microscopy (SEM) energy-dispersive spectroscopy (EDS) were performed the structural analysis. results of analysis indicated that second did not form in Ni1-xTbxFe2O4. Additionally, polyaniline-terbium doped composites...

The penetration of microwaves in various materials gives active microwave imaging a large potential for some applications medical imaging. This fairly recent technique is aimed at obtaining information about the physical properties an object which exposed to low power incident radiation. Measured external scattered field data used purpose. In this computer simulation work, electromagnetic far dielectric cylinder having infinite length are reconstruction under Born approximation. Using series...

In the last two decades, fiber optic distributed acoustic sensing (DAS) has gained popularity within many fields including seismic analysis and intrusion detection applications. this paper, we propose a DAS scheme for earthquake data purposes. Using our modified setup (previously used detection), successfully recorded earthquakes with epicentral distances ranging from 12 to 1319 km magnitudes 1.1 6.9, time period of August, 2019 - 2021. The utilized communication cables lie approximately 50...

This paper summarizes the results of our earthquake localization research, using distributed acoustic sensing (DAS) technology, with two 25 km long dark communication fiber optic cables close to North Anatolian Fault in Sea Marmara. In a previous study, we provided detection statistics for over 250 earthquakes, analysis metrics such as distance and magnitude. this paper, extend these include P S wave lag time-based epicenter estimation based on trilateration provide its accuracy, comparison...