One of the priorities for sustaining high standards of medium to long term health care is to provide an effective monitoring system thus reducing the need for multiple consultations and hospital visits. In this connection, implanted biosensors, equipped with a transceiver with an antenna to establish the wireless link either to an external wearable station or to a computer placed in the care unit or household, constitute an essential area for telemetry research. The major problem with this kind of application is due to the losses introduced by the body, which is very high at RF frequencies and beyond. For this reason the research today has tended to favor in magnetic coils. However, the magnetic coils have three major shortcomings: their intrinsic short range, the critical positioning required for the two coils (inside and outside the body), and the exhibited low data rate. Therefore, it is reasonable to conduct a further study on radiators based on electromagnetic coupling for subcutaneous wireless biosensors, where the distance between the implant and the interface body-air is below a few millimeters. This would be the case of certain applications such as glucose analysis for diabetes treatment, intracranial pressure characterization etc. The combination of biosensors with RFID, a well developed EM coupling technology, can offer a practical platform for a sustainable health care.