The effects of the near fields in micro-acoustic devices are pervasive and ubiquitous – they need to be understood profoundly, accounted for systematically and modelled accurately. This chapter summarizes the state-of- the-art methodologies for describing near-field phenomena by considering the simplest possible acoustic field; i.e., shear horizontally polarized waves. By referring to the cited works at the end of the chapter, and with some additional effort, the reader should be able to apply the presented theory to vector and more involved types of waves.