This paper presents a novel two-dimensional multi-branch model for the dynamic behavioral modeling and digital predistortion of dual-band power amplifiers (PAs) operated in concurrent multi-band, multi-standard mode. The model performance was validated by linearizing a dual-band class AB PA, driven by different bandwidth LTE and WCDMA signals. The measurement results showed the suppression of the spectral regrowth due to the intermodulation and cross modulation effects in concurrent dual-band PAs, and also showed significant improvement in terms of accuracy and complexity when compared to state-of-the-art models.