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Register a new userDesigning a High Selective Filter based on the Fractal Distribution of Slabs with Positive and Negative Permittivity and Permeability Using HFSS
تصميم مرشح عالي الانتقائية يعتمد التوزع التجزيئي لشرائح موجبة و سالبة معامل السماحية الكهربائية باستخدام (HFSS)
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Tishreen University ورقة بحثية
Publication date
2014
fields
Communication Engineering
and research's language is
العربية
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Shamra Editor
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اهتمت الأبحاث في السنوات الأخيرة بتفاعل الأمواج الكهرومغناطيسية مع التراكيب المصنعة ذات معامل السماحية الكهربائية (ε) و النفاذية المغناطيسية (μ) السالبين, تدعى هذه التراكيب بما وراء المادة (Metamaterial). تصمم هذه التراكيب بحيث تعطي خصائص كهرومغناطيسية لا تعطيها المواد الطبيعية المعروفة, أي أنها تكتسب خصائصها الكهرومغناطيسية من خلال تركيبها, و ليس من خلال المواد المكونة لها, و هي تمتلك خواص جديدة تحدد آلية مختلفة لانتشار الأمواج الكهرومغناطيسية خلالها. درست هذه المواد بشكل نظري, و صنعت من أجل العديد من التطبيقات و خاصة في المجال الميكروي و الضوئي. يعتمد هذا البحث على هذه المواد, و يوضحها و يحلل الخواص الكهرومغناطيسية الناتجة عن توضع أعمدة من هذه الشرائح سالبة معامل السماحية الكهربائية (ε) و النفاذية المغناطيسية (μ) (MMs) بشكل تجزيئي ضمن وسط مكون من مواد طبيعية. و يقارن العمل هذه الخواص مع الخواص الكهرومغناطيسية الناتجة عن توضع أعمدة من المواد الطبيعية بشكل تجزيئي أيضا, و يتم استخدام المحاكي (HFSS High Frequency Structure Simulator) الذي يعتمد طريقة العنصر المنتهي في حساب كل من معامل الإرسال و الاستقبال لهذه التراكيب.
Research over the past years has focused on electromagnetic waves and meta-materials. These structures are designed to give electromagnetic properties that cannot be produced by traditional, well known natural structures. Meta-materials obtain their electromagnetic properties from their structures, not from their components. Meta-materials have new properties that define different mechanisms for electromagnetic wave propagation. These materials have been studied theoretically and have been used in many applications, especially microwaves and photonic fields. This research depends on these kinds of material, explains them, and analyzes the electromagnetic properties that yield from putting columns from these slabs with negative permittivity and permeability coefficient (MMs) in a fractal distribution of a natural medium. This research also compares the resulting properties with the electromagnetic properties that yield natural materials distributed the same way. We use the HFSS simulator which depends on the finite element method for calculating transmission and reflection coefficient for these structures.
References used
Aysun KAYA " An investigation with fractal geometry analysis of time series" İZMİR July, 2005
Kenneth Falconer, " FRACTAL GEOMETRY Mathematical Foundations and Applications Second Edition University of St Andrews, UK Wiley 2003
BERTOLOTTI ,M ;MASCIULLI ,P;SIBILIA,C ;WIJNANDS,F ;HOEKSTRA, H. Transmission properties of a Cantor corrugated waveguide. Optical Society of America Vol. 13, No.3,1996, 628-634
MONSORIU,J.A;ZAPATA-RODRIGUEZ,C.J;SILVESTRE,E; FURLAN,W.D. Cantor -like fractal photonic crystal waveguides. Optics Communication No.252 , 2005, 46- 51
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In last decade, many of researches have proposed to study materials with periodic
structures,These structures can be engineered to realize novel electromagnetic properties
and to achieve behaviors that are not found in naturally materials. These ma
terials have
negative permittivity and permeability .Those are called meta-material or Left Hand
Material (LHM), They are fabricated, studied and analyzed within different applications of
microwave and optical communication. Recently, the microwave engineering applications
of artificial metamaterials have been widely discussed and various novel microwave
components were achevid for example, filters, antennas and fiber optic. This paper studys
and analyzes the reflection from fractal distribution of MMs layers in RHM medium, using
the recursive method, and applies it in the design of microwave narrow band filters.
In this research, tri-band microstrip band pass filter (BPF) has
been designed at frequencies (2.37,3.32 ,5.2)GHz which are
located at the domain of WiMAX and WLAN systems’
application by using tri-section stepped impedance resonators
TSSIRs with
open stub and zero feed line. By changing ratios
of impedance of stepped impedance resonator.
طريقة العناصر المنتهية
مرشح تمرير حزمة شرائحي ثلاثي الحزم
رنانات متدرجة الممانعة ثلاثية المقاطع
مقطع عرضي مفتوح
نسب الممانعة
ضياع الإدخال
tri-band microstrip band pass filter BPf
trisection stepped impedance resonators TSSIRs
open stub
ratios of impedance
finite element method FEM
Insertion loss
المزيد..
Knowledge graph embedding, representing entities and relations in the knowledge graphs with high-dimensional vectors, has made significant progress in link prediction. More researchers have explored the representational capabilities of models in rece
nt years. That is, they investigate better representational models to fit symmetry/antisymmetry and combination relationships. The current embedding models are more inclined to utilize the identical vector for the same entity in various triples to measure the matching performance. The observation that measuring the rationality of specific triples means comparing the matching degree of the specific attributes associated with the relations is well-known. Inspired by this fact, this paper designs Semantic Filter Based on Relations(SFBR) to extract the required attributes of the entities. Then the rationality of triples is compared under these extracted attributes through the traditional embedding models. The semantic filter module can be added to most geometric and tensor decomposition models with minimal additional memory. experiments on the benchmark datasets show that the semantic filter based on relations can suppress the impact of other attribute dimensions and improve link prediction performance. The tensor decomposition models with SFBR have achieved state-of-the-art.
Recently PGB (photonic band gap) filters show a great
development. Here we will present two different PGB filters with
lattice etched in the ground plane. The rejection band characteristic
is function of the number and shape of elements etched. Th
ese
filters are modelling by the FWCIP method.
In this research, we developed Auto Regressive Moving Average
(ARMA) method for simulation a Rayleigh fading channel with a
Gaussian Doppler spectrum instead of classical Doppler spectrum.
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