grating lobe
[/ˈɡreɪtɪŋ loʊb/]
nounpl: grating lobes
lóbulo de difração
1. In antenna arrays and signal processing, an unwanted secondary lobe that appears in the radiation pattern when the spacing between array elements exceeds half the wavelength, causing aliasing effects
The antenna designer had to adjust the element spacing to eliminate the grating lobes in the far-field pattern.
O projetista de antenas teve que ajustar o espaçamento dos elementos para eliminar os lóbulos de difração no padrão de campo distante.
2. A spurious radiation pattern lobe that results from spatial sampling of the electromagnetic field at frequencies above the design frequency
Grating lobes can severely degrade the performance of phased array radars if not properly controlled.
Os lóbulos de difração podem degradar severamente o desempenho de radares de matriz em fase se não forem adequadamente controlados.
This is a specialized technical term used primarily in electrical engineering, telecommunications, and radar system design. It is not commonly used in everyday conversation but is fundamental in the design and optimization of phased array antenna systems. The term is used identically in both Brazilian Portuguese and European Portuguese technical literature.
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