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This paper addresses the topics of energy harvesting for powering autonomous wireless sensors on board of geostationary broadcasting satellites. The feasibility of energy harvesting by using thermoelectric modules or rectennas is firstly discussed then the design and the implementation of a rectenna is presented. Experimental results in Ka band demonstrate(More)
– At the present time the insertion of RF MEMS switches into real architecture requires reduced actuation voltage, reduced dimensions and a better control of the electrical and electromechanical behavior that gives more importance to surface effects, their understanding and modeling. The use of such devices needs the development of methods for estimating(More)
This paper deals with digital archiving of cemetery heritage. A built cemetery is a tangible evidence of historical and cultural periods through the style and the shape of tombs. It gives quantitative information on the local population, about its history (by reading birth and death dates), its culture (by analysing name typology) and its temporal evolution(More)
Research on contact characterization for microelectromechanical system (MEMS) switches has been driven by the necessity to reach a high-reliability level for micro-switch applications. One of the main failures observed during cycling of the devices is the increase of the electrical contact resistance. The key issue is the electromechanical behaviour of the(More)
For the DC contact RF MEMS, it has been identified that most of the limitations are related to the quality and the repeatability of the contact that drive the RF performance (insertion losses, isolation, power handling) and the reliability [1]. In order to propose new generation of RF MEMS devices, it is important to get a deeper insight on the physic of(More)
Although molecular metals have been known for decades, their insolubility, low vapor pressure, and synthesis routes have prevented them from being integrated into electronic devices. We have prepared stable colloidal solutions of the organic metal TTF-TCNQ that overcome such difficulties. The solutions contain well-dispersed nanoparticles stabilized by long(More)
nanotubes and silver flakes filled epoxy resin for new hybrid conductive adhesives. OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. a b s t r a c t Combining conductive micro and nanofillers is a new way to improve electrical conductivity. Micrometric silver flakes(More)
We have developed an original reverse engineering method for generating rough surfaces on ANSYS platform, by using the actual shape of the contact surface. We used this method to predict the real contact area between rough surfaces as a function of the applied force. The number of asperities in contact, their sizes and distribution allow us to discriminate(More)
The testing and development of contact material or topology can be addressed with a dedicated experimental set up for monitoring test structures. However, it is difficult to perform the tests under realistic conditions. Moreover several works have already been published about the different theories describing rough mechanical contact. But they often ignore(More)
This paper describes the influence of different base plate materials on the electrical behavior of a RF GaN power device. Three different materials are tested and measured, first with a smaller device, then with a 36mm gate periphery AlGaN/GaN HEMT on SiC device, with an output power of 130W at L-band. The influence of the thermal conductance of each base(More)