Highly Compact and Sensitive Dielectric Sensors
This work proposes a novel and simple microwave technique for controlling the coupling factor between complementary split ring resonators (CSRRs) and microstrip transmission lines (TLs), which can be applied to the design of highly sensitive dielectric sensors. By varying the areas of the rectangular CSRRs while maintaining a fixed perimeter, the side lengths along TLs are varied, causing the coupling factor to be controlled. As a result, the physical sensing areas are miniaturized, which is important for various applications, leading to an enhancement in sensitivity. In addition, we demonstrate that the critical coupling between the external circuit (e.g., TLs) and CSRRs can be easily achieved if required by certain applications. Our simulations and experimental measurements demonstrate that our approach can relatively reduce the physical sensing areas by up to 69.4%. These results can help engineers to design compact sensors. Compared with a recently published work, the enhanced sensitivity for detecting the presence of dielectric materials is 63.16%. Our results provide a roadmap for satisfying different design constraints and specifications and demonstrate the potential for this technique to be adopted in a variety of dielectric sensing and filter applications.
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This work proposes a novel and simple microwave technique for controlling the coupling factor between complementary split ring resonators (CSRRs) and microstrip transmission lines (TLs), which can…