English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/8215
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Beam Steering with Segmented Annular Arrays

AutorUllate, Luis G.; Godoy, Gregorio; Martínez-Graullera, Óscar ; Sánchez Martín, Teresa
Palabras claveultrasonic imaging
2D arrays
volumetric imaging
Fecha de publicaciónoct-2006
EditorInstitute of Electrical and Electronics Engineers
ResumenTwo-dimensional (2-D) arrays of squared matrix have maximum periodicity in their main directions; consequently, they require half wavelength (λ/2), interelement spacing to avoid grating lobes. This condition gives rise to well-known problems derived from the huge number of array elements and from their small size. In contrast, 2-D arrays with curvilinear configuration produce lower grating lobes and, therefore, allow the element size to be increased beyond λ/2. Using larger elements, these arrays have the advantage of reducing the number of elements and of increasing the signal-to-noise ratio (SNR). In this paper, the beamforming properties of segmented annular phased arrays are theoretically analyzed and compared with the equivalent squared matrix array. In the first part, point-like elements are considered in order to facilitate the field analysis with respect to the array structure. Afterward, the effect of the element size on the steered beam properties also is presented. In the examples, it is shown that the segmented annular array has notably lower grating lobes than the equivalent squared matrix array and that it is possible to design segmented annular arrays with interelement distance higher than λ whose beam characteristics are perfectly valid for volumetric imaging applications.
Versión del editorhttp://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4012879
Aparece en las colecciones: (IAI) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Beam Steering with Segmented Annular Arrays.pdf1,91 MBAdobe PDFVista previa
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.