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A first proof-of-concept mm-sized implantable device using ultrasonic power transfer and a hybrid bi-directional data communication link is presented. Ultrasonic power transfer enables miniaturization of the implant and operation deep inside the body, while still achieving safe and high power levels (100 W to a few mWs) required for most implant applications. The current implant prototype measures...
A first proof-of-concept mm-sized implant based on ultrasonic power transfer and RF uplink data transmission is presented. The prototype consists of a 1 mm × 1 mm piezoelectric receiver, a 1 mm × 2 mm chip designed in 65 nm CMOS and a 2.5 mm × 2.5 mm off-chip antenna, and operates through 3 cm of chicken meat which emulates human tissue. The implant supports a DC load power of 100 μW allowing for...
We propose two methods of nullsteering for a compact analog uniform circular array system. One method is based on switched beam. The predefined null patterns were generated by nullsteering algorithms and saved in the array system. The second method is based on adaptive array. A single channel receiver and A/D converter were added to the analog array output for adaptive array processing. Therefore,...
This paper describes an RF source localization and tracking system using an 8-element uniform circular array. The system is capable of precise RF source localization, fast target recognition and discrimination, fast spectral sensing, real-time processing for location tracking, and the suppression of jamming and multi-path signals. Existing systems and technology for precision location and tracking...
This paper describes a novel approach of a robust and efficient 3D location estimation technique for non-cooperative, active or passive RF emitters in a noisy environment with two or more arbitrary shaped arrays. Each array can provide precise frequency, direction of arrival (DOA) estimation and time of - arrival (TOA) estimation for the far field RF emitters. For an M-element array, the DOA estimator...
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