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Proceedings of Conferences

Session 1 "Artificial Materials and Metamaterials"

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	Design of a circularly polarised patch antenna phase array on a high K EBG substrate (381.05 Kbytes) hot!	2004-06-29
Design of a circularly polarised patch antenna phase array on a high K EBG substrate J. C. Iriarte Galarregui⁽¹⁾, I. Ederra⁽¹⁾, R. Gonzalo Garcia⁽¹⁾, P. De Maagt⁽²⁾, ⁽¹⁾Electrical and Electronic Engineering Department, Universidad Publica de Navarra, Spain, ⁽²⁾European Space Research and Technology Centre, ESTEC, The Netherlands
		hits: 1670

	Electromagnetic wave diffraction by the microstrip two-periodic grating of curvilinear metal strips having chiral shape (299.78 Kbytes) hot!	2004-06-29
Electromagnetic wave diffraction by the microstrip two-periodic grating of curvilinear metal strips having chiral shape P. Mladyonov Institute of Radio Astronomy of National Academy of Sciences of Ukraine, Kharkov, Ukraine, Phone: (057) 744-85-96; e-mail: mladyon@rian.ira.kharkov.ua. Abstract–Reflection characteristics of microstrip two-periodic gratings of perfectly conducting infinitely long strips having the complex shape are considered. The effect when reflected field possess orthogonal polarization relative to incidence wave polarization is considered. The possibility of insertion the control device in strips for the transformation considered grating to the array from the strip disconnected elements is proposed. The possibility for the structure application as high-impedance surface is considered. The comparison of the reflection properties of the two-periodic gratings of non-chiral strips and straight-line strip gratings is presented.
		hits: 1292

	Modeling of artificial isotropic double negative (DNG) media composed by spherical particle lattices embedded in a dielectric matrix (265.39 Kbytes) hot!	2004-06-29
Modeling of artificial isotropic double negative (DNG) media composed by spherical particle lattices embedded in a dielectric matrix I. Kolmakov⁽¹⁾, M. Gashinova⁽²⁾, O. Vendik⁽²⁾ ⁽¹⁾Department of Microelectronics & Radio Engineering, St. Petersburg Electrotechnical University, Russia, ⁽²⁾Department of Electronics, St. Petersburg Electrotechnical University, Russia Abstract – The periodic composite medium consisting of two lattices of different dielectric spherical particles has been investigated analytically and numerically. It is shown that effective double negative media (DNG) can be realized in the frequency region where resonance of TM mode in the particles of one kind and TE mode in the particles another kind exist simultaneously. Ferroelectric single crystals or ceramic samples with dielectric constant about 1000 can be used as a suitable material for manufacturing the spherical particles.
		hits: 1294

	Transport in narrow minigap superlattices and the terahertz Bloch oscillator (167.71 Kbytes) hot!	2004-06-29
Transport in narrow minigap superlattices and the terahertz Bloch oscillator D.I.Zinchenko⁽¹⁾, A.A.Andronov⁽¹⁾, M.N.Drozdov⁽¹⁾, Yu.N.Nozdrin⁽¹⁾, A.Sosnin⁽¹⁾, A.Ustinov⁽¹⁾, V.I.Shashkin⁽¹⁾, A.A.Marmalyuk⁽²⁾ and A.A.Padalitsa⁽²⁾ ⁽¹⁾Institute for Physics of Microstructures, Russian Academy of Sciences, Russia, ⁽²⁾SIGM plus, Russia Abstract – Transport properties of GaAs-GaAlAs weak barrier superlattices are studied by computer simulation and observation of current-voltage curves and the terahertz emission. Existence of terahertz dynamic negative differential conductivity is demonstrated in the simulation. The observed terahertz emission is considered as due to incoherent Bloch oscillation emission. Prospect for the terahertz Bloch oscillator based on such superlattices is discussed.
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	Submillimeter imaging system based on AlGaAs/GaAs hot electron bolometer mixers (216.51 Kbytes) hot!	2004-06-29
Submillimeter imaging system based on AlGaAs/GaAs hot electron bolometer mixers D.V. Morozov, S.N. Maslennikov, R.V Ozhegov, K.V. Smirnov, O.V. Okunev, and G.N. Gol’tsman Physics Department, Moscow State Pedagogical University, Russia Electromagnetic radiation of the submillimeter (SMM) range is dispersed and absorbed significantly less than infrared (IR) radiation when passing through different objects. That is the reason for the development of a SMM imaging system. In fact, strong absorption of IR radiation in water and water vapor makes it impossible to use IR air and sea navigation systems when it is fog or raining...
		hits: 1298

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