Abstract
The proposed structure in this research is constructed on substrate integrated waveguide (SIW) technology and has a mechanism that produces 16 different and distinct resonant frequencies between 2.45 and 3.05 GHz by perturbing a fundamental TE10 mode. It is a unique method for producing multiple resonances in a radio frequency planar structure without any extra circuitry or passive elements is developed. The proposed SIW structure has four vertical fluidic holes (channels); injecting eutectic gallium indium (EGaIn), also known commonly as liquid metal (LM), into these vertical channels produces different resonant frequencies. Either a channel is empty, or it is filled with LM. In total, the combination of different frequencies produced from four vertical channels is 16.
Highlights
The most promising wireless sensor application is the radio frequency identification (RFID), that is a technology based on the mutual exchange of information through radio signal propagation [1].Owing to its quality of identifying and tracking items, RFID systems are used for many applications: healthcare, facility management, aviation, security, retailing, etc
We have proposed a resonator structure based on substrate integrated waveguide (SIW)
The capability to reuse multiple frequencies was achieved by injecting eutectic gallium indium (EGaIn) liquid metal (LM) alloy into the four vertical fluidic channels
Summary
The most promising wireless sensor application is the radio frequency identification (RFID), that is a technology based on the mutual exchange of information through radio signal propagation [1]. In wireless sensor application research, chipless resonator tags for RFID are at the forefront of the conventional barcode replacement. When prices in the food chain increase or decrease, we do not need to redesign the tag; we can use the 15 available frequency choices by filling the empty channels of the resonator with the LM and reading new information from a new frequency. This makes the resonator very much reusable
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