Multiband switching realized by a bidirectionally tunable and multiconfiguration acoustic diode

We propose a bidirectionally tunable and multiconfiguration acoustic diode. The acoustic characteristics of the proposed prototype acoustic diode (PAD) were investigated experimentally and numerically. The results indicated that the PAD could achieve a favorable tunability index (rate of total changes in contrast ratio) of up to 124.3%. The PAD can not only turn on or off unidirectional transmission but realize the “bidirectionally tunable effect” to tune unidirectional transmission in the forward or backward direction within multibands. In particular, the PAD employs a unique control system for switching the types of tunability from unidirectional to bidirectional. Moreover, we propose a plate-type acoustic diode (PTAD). The PTAD was observed to demonstrate favorable tunability within multibands, and the rate of total variation in its contrast ratio approached 108.0%.