  Intelligent reflecting surfaces (IRSs), active and/or passive, can be densely
deployed in complex environments to significantly enhance wireless network
coverage for both wireless information transfer (WIT) and wireless power
transfer (WPT). In this letter, we study the downlink WIT/WPT from a
multi-antenna base station to a single-antenna user over a multi-active/passive
IRS (AIRS/PIRS)-enabled wireless link. In particular, we aim to optimize the
location of the AIRS with those of the other PIRSs being fixed to maximize the
received signal-to-noise ratio (SNR) and signal power at the user in the cases
of WIT and WPT, respectively. We derive the optimal solutions for these two
cases in closed-form, which reveals that the optimal AIRS deployment is
generally different for WIT versus WPT. Furthermore, both analytical and
numerical results are provided to show the conditions under which the proposed
AIRS deployment strategy yields superior performance to other baseline
deployment strategies as well as the conventional all- PIRS enabled WIT/WPT.
