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Tag unit_cells [4 articles]

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	Folded reflectarray antenna Electronics Letters, Vol. 34, No. 9. (30 April 1998), pp. 832-833. by D. Pilz, W. Menzel posted to unit_cells reflector low_profile high_gain_antenna element array by chrisfischer on 2009-11-06 10:11:08 Abstract Copy My Attachments My Copy Abstract A novel folded reflectarray antenna is presented. This antenna combines a twist and focusing reflector concept in a single printed structure. Together with a printed grid, a low profile and high gain antenna results. A test antenna in the 20 GHz range was designed, fabricated and tested ...
	Realization of 35 GHz Steerable Reflectarray using Highly Anisotropic Liquid Crystal Antennas and Propagation Society International Symposium 2006, IEEE (23 October 2006), pp. 4307-4310. by R. Marin, A. Mossinger, J. Freese, A. Manabe, R. Jakoby posted to unit_cells liquid_crystal array antenna by chrisfischer on 2009-11-06 09:34:52 Abstract Copy My Attachments My Copy Abstract This paper investigates the realization of reconfigurable reflectarrays based on tunable liquid crystals (LC). Two different concepts of unit cells using highly anisotropic LC have been designed and measured, showing good results and the possibility of employing them in a full-scale reflectarray. A 16 times 16 fixed beam microstrip reflectarray has been developed and measured, in order to verify the feeding concept. Good agreement is obtained between simulation and measurement ...
	Dynamic crushing of 2D cellular structures: A finite element study International Journal of Impact Engineering, Vol. 32, No. 1-4. (December 2005), pp. 650-664. by Z. Zheng, J. Yu, J. Li posted to voronoi unit_cells random_placement material_microstructure localization_deformation impact_loading finite_element_analysis dynamic_modelling 2d by ellulbrian on 2009-10-24 15:03:49 Abstract Copy My Attachments My Copy Abstract The dynamic crushing behavior of 2D cellular structures is studied by finite element method using ABAQUS/Explicit code. The influences of cell irregularity and impact velocity on the deformation mode and the plateau crush pressure are investigated. Two irregularity-generating methods are used. One is the disorder of nodal locations of a regular hexagonal honeycomb and the other is based on the 2D random Voronoi technique. The results show that the deformation in an irregular honeycomb is more complicated than that in a ...
	Micromechanics of spatially uniform heterogeneous media: A critical review and emerging approaches Composites Part B: Engineering, Vol. 40, No. 5. (14 July 2009), pp. 349-378. by Marek-Jerzy Pindera, Hamed Khatam, Anthony S. Drago, Yogesh Bansal posted to unit_cells review representative_volume_element periodic_boundary_conditions mechanical_properties material_microstructure homogenization homogeneous_materials finite_element_analysis classical_models cellular by ellulbrian on 2009-10-24 12:25:13 Abstract Copy My Attachments My Copy Abstract Outside of the classical microstructural detail-free estimates of effective moduli, micromechanical analyses of macroscopically uniform heterogeneous media may be grouped into two categories based on different geometric representations of material microstructure. Analysis of periodic materials is based on the repeating unit cell (RUC) concept and the associated periodic boundary conditions. This contrasts with analysis of statistically homogeneous materials based on the representative volume element (RVE) concept and the associated homogeneous boundary conditions. In this paper, using the above classification framework we ...

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