  The perfectly matched layer (PML) formulation is a prominent way of handling
radiation problems in unbounded domain and has gained interest due to its
simple implementation in finite element codes. However, its simplicity can be
advanced further using the isogeometric framework. This work presents a spline
based PML formulation which avoids additional coordinate transformation as the
formulation is based on the same space in which the numerical solution is
sought. The procedure can be automated for any convex artificial boundary. This
removes restrictions on the domain construction using PML and can therefore
reduce computational cost and improve mesh quality. The usage of spline basis
functions with higher continuity also improves the accuracy of the numerical
solution.
