  Conventional mechanical antennas provide a strategy in long-wave
communication with a surprisingly compact size below 1/1,000 of the wavelength.
However, the narrow bandwidth and weak field intensity seriously hamper its
practical applications. Here, we present a mechanical antenna based on the
electrostrictive effect of PMN-PT-based relaxor ferroelectric ceramic to
improve radiation capacity and achieve ultra-wideband characteristics (10 kHz -
1 MHz, the relative bandwidth is beyond 196%). Determined by the different
underlying mechanism, the mechanical antenna based on the electrostrictive
effect exhibits excellent communication properties from traditional mechanical
antennas. The functions of signal coding, transmitting, receiving, and decoding
were experimentally demonstrated. This approach offers a promising way of
constructing mechanical antennas for long-wave communication.
