Novel impedance matching materials and strategies for air-coupled piezoelectric transducers

This paper reviews the ideal configuration of air-coupled transducers and compares it with that of actual ones. This reveals the main problems present nowadays in the design and construction of these transducers, consequently, some solutions are proposed: 1. Modification of the selection criteria for the matching layers, with a proposal of a new kind of impedance matching materials and 2. New design strategies to cope with the inevitable non-ideal features present in the design.