EM methods for full-wave characterization of microwave integrated circuits

International audienc

Extraction Of The Series-Resistance Of Au-Oxide-n- InP Structures

This paper reports on the electrical properties of Au-oxide-n-InP structures obtained by oxygen plasma oxidation and those oxidised by air. A discussion on the evolution of the series resistance according to the temperature is presented. The values of the electrical parameters are obtained with a modified current-voltagetemperature model. The results obtained establish the relationship between the series resistance and the temperature for the Au - oxide - n-InP structures obtained by oxygen plasma oxidation and those oxidised by air. The values of this parameter in the Au-oxide-n-InP structures are in good agreement with those published in the literature

A highly efficient power harvester with wide dynamic input power range for 900 MHz wireless power transfer applications

This work demonstrates the design of an adaptive reconfigurable rectifier to address the issue of early breakdown voltage in a conventional rectifier and extends the rectifier's operation for wide dynamic input power range. A depletion-mode field-effect transistor has been introduced to operate as a switch and compensate at low and high input power levels for rectifier. This design accomplishes 40% of RF-DC power conversion efficiency over a wide dynamic input power range from -10 dBm to 27 dBm, while exhibiting 78% of peak power efficiency at 22 dBm. The power harvester is designed to operate in the 900 MHz ISM band and suitable for Wireless Power Transfer applications

Advanced neural-based CAD tools for communication system modelling and design

International audienc

Efficient rectenna with wide dynamic input power range for 900 MHz wireless power transfer applications

This work demonstrates the design of a rectenna to operate over wide dynamic input power range. It utilizes an adaptive reconfigurable rectifier to overcome the issue of early breakdown voltage in conventional rectifiers. A depletion-mode field-effect transistor has been introduced to operate as a switch and compensate at low and high input power levels for the rectifier. In addition, a meandered monopole antenna has been exploited to collect RF energy. The rectifier design achieves 40% of RF-DC power conversion efficiency over a wide dynamic input power range from -17 dBm to 27 dBm and the antenna exhibits a directivity of 1.92 dBi as well as a return loss of -33 dB. The rectenna is designed to operate in the 900 MHz ISM band and suitable for Wireless Power Transfer (WPT) applications

Conception d'une antenne de tags UHF passifs

International audienc

Conception d'une Antenne de Tag RFID UHF Passif

International audienc

On the Design and Miniaturization of Passive UHF RFID Transponder Antenna

International audienceUHF RFID is an emerging technology taking profits of the development of low cost passive RFID transponder taking advantages of the backscatter modulation principle. Therefore the EPC Global, an international organisation driving the development of standards for the electronic identification of products, leads toward item level identification using RFID. But, excluding ethical issues that could be an opposition to this decision, it is believed that such a resolution will be economically viable only if RFID tag cost falls under 0.10 € each and that the RFID tag world production capacity reaches several hundreds of million of tags a year. To attain this objective, RFID tag miniaturization could be a solution as it could allow increasing the tag production capacity (then allow decreasing tag cost) as well as it permits RFID tags to be less noticeable

Low-loss compact power combiner for solid state power amplifiers with high reliability

In this study, a low-loss and compact planar power combiner for solid state power amplifiers (SSPAs) is proposed. It combines eight power amplifier modules with low insertion loss (IL) and high reliability by utilising a novel magic-Tee configuration and E-plane bend along with a suitable microstrip-to-waveguide transition. The fabricated prototype was implemented through automatic milling machines to produce three planar layers that form the final structure. This novel approach enabled precise fabrication, simple assembly of the SSPAs as well as low-cost manufacturing in comparison with existing traditional approaches. This process is suitable for SSPAs operating from 4 to 40 GHz. The combined IL of the implemented combiner network is less than 0.6 dB at Ka-band, 0.5 dB at Ku-band, and 0.4 dB at X-band while exhibiting a 10% fractional bandwidth