Técnica para mejorar la linealidad en arrays activos aprovechando sus propiedades de combinación espacial de potencia

Abstract

In this paper, a linearity improving technique for active arrays, based on spatial power combining, is presented. An auxiliary branch is employed to cancel the radiation pattern at the intermodulation distortion (IMD) components in the main beam direction. The need for having a precise amplitude and phase control over the IMD currents in the array auxiliary elements is demonstrated, quantifying the possible degradation suffered in the Carrier to Intermodulation Distortion ratio (CIMD) improvement obtained when this solution is applied. The potentialities of implementing the derivative superposition technique in large-signal regimes in an array are finally proposed.