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Bulunan: 7 Adet 0.001 sn
Yazar/lar : AÇIKGÖZ, Hulusi ✕Atıf Dizini : Wos ✕
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Erişime Açık

Statistical Analysis of Electromagnetic Structures and Antennas Using the Polynomial Chaos Expansion Method

AÇIKGÖZ, Hulusi | MITTRA, Raj

Electromagnetic (EM) structures such as antennas, resonators, are widely used in EM communication systems. It is not uncommon to find that the performance characteristics of these structures are not as expected because of the uncertainties introduced during the manufacturing process. These uncertainties may arise, for instance, from variations of the dimensions of the device or its material properties, e.g., permittivity and permeability. A statistical tool based on the use of the Polynomial Chaos Expansion (PCE) technique is proposed in this work. The results of investigation of two EM struct ...Daha fazlası

Konferans Bildirisi 2017 IEEE 5 Görüntülenme
Erişime Açık

Statistical Investigation of a Dual-Band Wearable Patch Antenna

AÇIKGÖZ, Hulusi | MITTRA, Raj

We present a stochastic modeling strategy for studying a wearable textile antenna under different manufacturing conditions. The studied device is a patch antenna designed for energy harvesting, which operates at the GSM and DCS bands, 900MHz and 1800MHz, respectively. The performance of the conductive patch printed on a textile substrate backed by a ground plane is investigated. A stochastic approach is employed to assess the variability of the observable because of the uncertainties introduced in the manufacturing process, such as laminating and embroidering.

Konferans Bildirisi 2017 IEEE 4 Görüntülenme
Erişime Açık

Statistical electromagnetics for antennas

AÇIKGÖZ, Hulusi | ARYA, Ravi Kumar | WIART, Joe | MITTRA, Raj

After a brief introduction, this chapter discusses the state of the art of variable antennas and previous works on these antennas are reviewed. This is followed by an introduction to the most common statistical analysis techniques used for the purpose of the uncertainty propagation. The application of the statistical method to some real case structures is then considered; split ring resonator (SRR) and wearable antennas.

Makale 2018 SCITECH PUBL INC 3 Görüntülenme
Erişime Açık

Internal Homogenization of Biological Tissues for Electromagnetic Dosimetry

AÇIKGÖZ, Hulusi

In this paper, the internal homogenization method is introduced to determine the effective physical properties (permittivity and conductivity) of biological tissues. This method is performed on a 2D child head model obtained from MRI data. An original procedure where the complex 2D head model is represented as a multilayered circular structure is employed to retrieve the effective medium parameters. Results obtained with the proposed internal homogenization concept are compared with those obtained from the original heterogeneous model (with 4 tissues) and effective medium theories such as Maxw ...Daha fazlası

Makale 2016 APPLIED COMPUTATIONAL ELECTROMAGNETICS SOC 2 Görüntülenme
Erişime Açık

Suppression of Surface Currents at Microwave Frequency Using Graphene-Application to Microwave Cancer Treatment

AÇIKGÖZ, Hulusi | MITTRA, Raj

In this work we consider the problem of surface currents suppression using graphene in the context of microwave cancer treatment. Most of the research on graphene has been focused on its applications at terahertz frequencies, and not at microwave frequencies. The use of microwave cancer ablation technique using a coaxial slot antenna is being limited because of the existence of surface currents which lead to the heating of the healthy tissues along its outer surface. In this work we propose to use graphene which is a single-atom sheet of carbon, as a solution to prevent the propagation of surf ...Daha fazlası

Makale 2016 APPLIED COMPUTATIONAL ELECTROMAGNETICS SOC 5 Görüntülenme
Erişime Açık

Grafen Benzeri Malzeme ile Kanser Tedavisinde Kullanılan Mikrodalga Antenlerde oluşan Yüzey Akımlarının Azaltılması

YILMAZ, Adem | AÇIKGÖZ, Hulusi | UZMAN, Burak

Bu çalışmada, kanser tedavisindeki önemi hızla artan mikrodalga yönteminde karşılaşılan geriye doğru ısınma problemi incelenmiştir. Daha önce yaptığımız grafen tabanlı malzeme kullanarak yüzey akımının en aza indirilmesi çalışmalarının devamı niteliğinde olan bu çalışmada grafenli ve grafensiz eş eksenli yarık antenlerin dış iletkeninde oluşan yüzey akımı gözlemlenmiştir. Doku içindeki SAR dağılımı ve buna bağlı olarak oluşan sıcaklık dağılımı incelenmiş ve grafen kaplanmış antenin yüzey akımını azaltmakta başarılı olduğu görülmüştür.

Konferans Bildirisi 2016 3 Görüntülenme
Erişime Açık

Stochastic Polynomial Chaos Expansion Analysis of a Split-Ring Resonator at Terahertz Frequencies

AÇIKGÖZ, Hulusi | MITTRA, Raj

Polynomial chaos expansion (PCE) technique is applied to a conducting array of split-ring resonator to study the effect of the uncertainties of its design parameters on its reflectance at terahertz frequencies. The uniformly distributed random input design parameters have been considered. The first (average) and second (standard deviation) moments are estimated using the PCE. Strong variation of the output response caused by the uncertainties of the design parameters has been noticed. A sensitivity analysis has been carried out to assess the influence of each input parameters on the reflectanc ...Daha fazlası

Makale 2018 IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC 2 Görüntülenme
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