[IEEE 2014 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO) - London, United Kingdom (2014.12.8-2014.12.10)] 2014 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-Bio2014) - Comparison of inkjet-printed and microfabricated loop antennas for implants in wireless brain-machine interface systems