A wireless passive ultrasensitive temperature transducer is presented in this paper. The transducer consists of micro bimorph cantilevers (Aluminum-Silicon) and split ring resonators, operating at millimeter wave frequencies around 30 GHz. As the temperature changes, the bilayer cantilevers deflect and thus alter the resonant frequencies of the resonators. The design achieves a sensitivity of 1.05 GHz/um with respect to cantilever deflection, corresponding to a sensitivity of 150 MHz/oC, three orders of magnitude higher than existing passive wireless temperature sensors. The sensor design has high Q factor, is ultra-compact, easily fabricated and integrated with other passive sensors in sensing networks. Depending on material choices, the proposed design can also be utilized in harsh environments. To demonstrate the proof-of-concept, scaled designs around 4 GHz are presented, utilizing Aluminum-PET (Polyethylene terephthalate) bilayer cantilevers, achieves a sensitivity of 2.14 MHz/oC. WE1D: Advances in microwave sensors and object detection systems.

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This article demonstrates how inkjet-printing of antennas/matching networks on low-cost paper-based materials can tackle all four challenges enabling the easy implementation of ubiquitous RFID and WSN networks by reviewing major milestones achieved in this area by this research group. It starts by discussing why paper should be used as a substrate for UHF/wireless inlays, followed by the dielectric characterization of paper using a microstrip ring resonator method. This paper then shows show how we can use conductive inkjet-printing technology for the fast fabrication of RF/wireless circuits, provides a design guideline for an inkjet-printed broadband antenna for UHF RFID tags which can be used globally, and eventually shows the capability of integrating sensors with RFID tags stressing how this functionality could revolutionize data fusion and real-time environmental cognition.

A frequency doubler TAG structure realized on both plastic and paper is presented. It is based on the crossed dipole structure, but uses four diodes in a bridge configuration to form a balanced multiplier layout and incorporates the necessary DC path in a simple way within the structure. Measurements results are presented for both the plastic and paper structure, showing the feasibility of economic and green electronics on paper. WE4A: RFID and Power Harvesting Technologies