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In this paper, a LC (inductor capacitor) wireless gas sensor is demonstrated for the identification of volatile organic compounds (VOC's) in the air environment. A near-field LC resonant tank consisting of an interdigitated capacitor fabricated on a porous flexible substrate coupled with an inductor coil is used as a sensor and its resonance is interrogated using an external pick up coil. The porous...
In this paper, a low cost, simple to design, multi-band passive RFID tags with programmable frequency signature are demonstrated for packaging surveillance applications in a supply chain. The developed tags have good clutter rejection and lower cost per tag. The clutter rejection is achieved by employing harmonic radar concepts with improved interrogation range and efficiency. The developed RFID tags...
In this paper, a passive harmonic generator based wireless sensor for long range interrogation of small liquid samples is demonstrated. A step by step method for development of the harmonic doubler based sensor is presented. Two different sensor designs are evaluated for liquid sensing. The first sensor is a T-line resonator coupled to patch antennas and harmonic doubler. The second sensor is a compact...
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