  In this study, a phenomenological model is proposed based on
Wentzel-Kramers-Brillouin (WKB) theory and applied to investigate the
two-proton ($2p$) radioactive half-lives of nuclei near or beyond the proton
drip line. The total diproton-daughter nucleus interaction potential is
composed of the Hulthen-type electrostatic term and the centrifugal term. The
calculated $2p$ radioactive half-lives can accurately reproduce the existing 10
experimental datasets of five true $2p$ radioactive nuclei with $\sigma$ =
0.736. In addition, we extend this model to predict the half-lives of possible
$2p$ radioactive nuclei whose $2p$ radioactivity is energetically allowed or
observed but not yet quantified in NUBASE2016. The predicted results are in
agreement with those obtained using the Gamow-like model, generalized liquid
drop model, Sreeja formula, and Liu formula.
