A wireless transceiver includes an antenna array that transmits an outbound RF signal containing outbound data to remote transceivers and that receives an inbound RF signal containing inbound data from the remote RF transceivers, wherein the antenna array is configurable based on a control signal. Advantageously, the biodegradable segment includes a hydrophilic segment and a hydrophobic segment. 0, and including colloidal silica, an organic acid that has at least one sulfonic acid group or phosphonic acid group in the molecular structure thereof and functions as a polishing accelerator for silicon nitride, and water.