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This paper will review the propagation characteristics of radio frequency emissions in metal-clad medium voltage switchgear. The radio frequency emissions will be generated using various sources of partial discharge and measured using a prototype distributed antenna based partial discharge detection system. It will be shown that partial discharge sources of varying type and magnitude can be detected...
Recently, non-contact radio-frequency (RF) methods have shown promising potential to be used as a complement to the IEC 60270 standard method for the detection and localization of partial discharge (PD) in high voltage insulation. This paper reports the results of an experimental investigation on the characteristic of partial discharge in an air gap using the (RF) method combined with the high-frequency...
A differentially-fed omnidirectional circularly-polarized antenna is investigated for application in RF energy harvesting. The antenna is composed of a two-layer substrate and back-to-back printed square patches which have two diagonal stubs and one truncation. The patches share a common ground plane. Both patches generate circular polarization (CP) and omnidirectional CP is provided. The antenna...
Contactless Payment incorporates the Proximity card specification for the physical-layer of the air interface. The physics is based on the coupling of resonant loop antenna circuits in the inductive near-field. Two main effects determine the near-field communication channel in the 13.56 MHz ISM frequency band: A strong decrease of H-field with increasing distance between reader and card, and a shift...
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...
A wide-band 900 MHz to 2.45 GHz rectenna has been developed for Radio Frequency (RF) energy harvesting in the context of outdoors Wireless Sensor Nodes (WSN). Based on simulations of different rectifying circuits, the most appropriate one for low incident power levels has been manufactured and tested with a wide-band antenna. The theoretical analysis, confirmed by measurements, shows that the proposed...
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