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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

	Ferroelectric (Ba,Sr)TiO3 ceramics for tunable wakefield accelerating structures (252.32 Kbytes) hot!	2004-06-29
Ferroelectric (Ba,Sr)TiO3 ceramics for tunable wakefield accelerating structures S. S. Karmanenko, A. A. Semenov, and P. Yu. Belyavskiy Dept. of Electron-ion processing of solids, St.-Petersburg Electrotechnical University, 5 Prof. Popov st., 197376, St. Petersburg, Russia Abstract – The results of complex study of (Ba,Sr)TiO3 (BST) ceramics with magnesium (BSM) and lanthanoid (BSL) additives, which are used to vary the resonant frequency of a dielectric loaded structure in the wakefield accelerating structures are presented. The structure consists of a thin layer of ferroelectric material backing a layer of linear ceramic with high quality factor. The interdigital electrodes formed on the external surface of double ceramic layer are used to apply DC bias voltage to vary the permittivity of the ferroelectric layer and tune the overall frequency of accelerating structure. Three different techniques of electrode-less measurements of microwave dielectric characteristics of ferroelectric ceramics are presented. Suitable material for this application is BST ferroelectric-oxides compound with a dielectric constant of 300-500. A tuning range of 2-4 % could be achieved for an 11-13 GHz dielectric accelerating structure.
		hits: 1564

	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.
		hits: 1551

	Metamaterials as super-substrate to enhance dipole antenna performances (562.73 Kbytes) hot!	2004-06-29
Metamaterials as super-substrate to enhance dipole antenna performances E. Sбenz⁽¹⁾, R. Gonzalo⁽¹⁾, I. Ederra⁽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 Abstract – In this work, pass band properties of Left Handed Media (LHM) are demonstrated. These properties have been used in order to make a LHM super-substrate is going to determine the characteristics of radiation patterns. Simulations with different types of configurations are presented in order to enhance the features of radiation patterns at bore-sight direction.
		hits: 1368

	Experimental Waveguide Characterization of a New Artificial Magnetic Particle (143.59 Kbytes) hot!	2004-06-29
Experimental waveguide characterization of a new artificial magnetic particle P. Ikonen, S. I. Maslovski, and S. A. Tretyakov Radio Laboratory / SMARAD, Helsinki University of Technology, P.O. Box 3000, FI-02015 HUT, Finland Abstract – This paper describes in detail the measurement procedure of a new artificial magnetic particle. A waveguide measurement technique is used to measure the scattering parameters of the particle. The results are processed to extract the magnetic polarizability. We generally introduce the measurement setup and carry out in detail the analysis for processing the results. The goal is to show that even when measuring complex particles, reasonable measurement accuracy can be achieved with a rather simple measuring cell.
		hits: 1364

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