Antenna miniaturization is one of the biggest challenges against the backdrop of increasing density of electronic components on the circuit board of handheld devices [1] and biomedical devices for body-centric wireless communications [2]. Especially for biomedical application, an antenna is needed in an implantable or ingestible device for both communications and power charging. However, space is always limited for the antenna in the device, e.g. a pace maker or a capsule endoscope. The current antenna designs have reached their ultimate limit of miniaturization and new design paradigms are needed in order to break the limits of antenna miniaturization. The present work is focused on the use of piezoelectric materials as antennas for antenna miniaturization for body-centric wireless communications.