  This letter proposes a new concept of integrated sensing and wireless power
transfer (ISWPT), where radar sensing and wireless power transfer functions are
integrated into one hardware platform. ISWPT provides several benefits from the
integrating operation such as system size, hardware cost, power consumption,
and spectrum saving, which is envisioned to facilitate future 6G wireless
networks. As the initial study, we aim to characterizing the fundamental
trade-off between radar sensing and wireless power transfer, by optimizing
transmit beamforming vectors. We first propose a semi-definite relaxation-based
approach to solve the corresponding optimization problem globally optimal, and
then provide a low-complexity sub-optimal solution. Finally, numerical results
verify the effectiveness of our proposed solutions, and also show the trade-off
between radar sensing and wireless power transfer.
