  In this paper we study frame-like properties of a wave packet system by using
hyponormal operators on $L^2(\mathbb{R})$. We present necessary and sufficient
conditions in terms of relative hyponormality of operators for a system to be a
wave packet frame in $L^2(\mathbb{R})$. A characterization of hyponormal
operators by using tight wave packet frames is proved. This is different from a
method proved by Djordjevi$\acute{c}$ by using the Moore-Penrose inverse of a
bounded linear operator with a closed range. The linear combinations of wave
packet frames generated by hyponormal operators are discussed.
