URSI 2008, XXIII Simposium Nacional de la Unión Científica Internacional de Radio, Madrid
In this paper, a high linearity power amplifying active antenna is proposed. Taking advantage of a large signal regime device-level bias-adaptation technique, a low radiated distortion level with independence of the radiated power is assured, improving the linearity-efficiency trade-off. Two PHEMT-based power amplifiers excite the perpendicular input ports of an aperture coupled patch antenna in a quadrature-phase configuration achieving amplitude control of the radiated field with circular polarization. Beamforming capabilities of the designed antenna have also been considered for different amplitude distributions employing such studied bias-adaptation technique. An specific test set-up has been implemented to completely characterize the antenna behavior using digital modulated signals.
