An accurate modeling technique for antennas and nonlinear RF power amplifier mixed simulation
Abstract
The design of agile active antennas requires an efficient modeling methodology in order to quantify the impact of other com- ponents on the array radiation pattern, and especially the influence of power amplifiers (PA). Therefore, the performance prediction of PA on TX chains is of prime importance. This article describes two different approaches for active antenna appli- cations. The first one concentrates on PA macro-modeling, which takes into account a large output load impedance mismatch with a voltage standing wave ratio up to 4:1. A PA behavioral model based on nonlinear scattering functions was developed and extracted from CW measurements. The model validity was checked by comparison with the measured data. The second one describes a novel technique for synthesizing a given radiation pattern, whereas taking into account the mutual coupling and calculated matching impedances (ZL = 50 V) of each antenna in the array according to frequency and pointing angle.
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