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Ultrasounds (US) are a proven medical tool to assess a myriad of biological processes, including breast cancer screening, fetal development and blood flow. However, US also have the potential to deliver power and telemetry capability to deeply implanted devices, surpassing some challenges faced by coils or antennas operating inside the human body. In this study we present an implantable device powered...
Ultrasounds are a proven medical tool to assess some biological processes, including breast cancer screening, fetal development and blood perfusion. However, ultrasounds also have the potential to deliver power and telemetry capabilities to deeply implant devices, surpassing some of the challenges faced by coils or antennas operating inside the human body. In this paper, we present a small-form implantable...
The performance of novel RF switching devices using insulating gate III-nitride metal-oxide-semiconductor heterostructure field-effect transistors (MOSHFETs) is demontrated. Initial results show that there is no degradation in the transmitted powers or gate leakage current during the 200+ hours stress with +30 dBm CW input powers. Multi-gate RF switching devices that increase the isolation in the...
The evaluation of uplink performance of delivering WiMAX services from high altitude platforms (HAPs) is presented. System performance is assessed in terms of coexisting capability with terrestrial WiMAX system, employing directive antenna models and optimization techniques. Simulation results show that providing WiMAX via HAPs can effectively achieve 29 dB at the edge of the HAP coverage area with...
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