Abstract
In this work, a compact, inexpensive, and efficient dual band microwave sensor is proposed. The sensor is based on two Complementary Symmetric Split-Ring Resonators (CSSRRs) and possesses a high $Q$ factor and wide sensing range. These CSSRRs are coupled electrically with two inductive patches to the Microstrip Transmission Line (MTL). This combination provides two dual bands, first at 5.35 GHz with a notch depth of -55.20 dB and second at 7.99 GHz with a notch depth of -22.54 dB. The sensor works in transmission mode and senses shift in frequency. Some commonly available dielectric substrates with relative permittivity ranges between 1 and 12 are considered Material Under Test (MUT), and detailed sensitivity analysis is being performed for each band. The dual band sensor is fabricated on a low-cost, widely available FR4 substrate and measured by CEYEAR AV3672D vector network analyzer. Additionally, the least square curve fitting method is used to develop a mathematical model for the measured results. An excellent agreement is observed between simulated, measured, and formulated results.
Highlights
Material characterization technologies play a very vital role in various scientific fields [1]-[3]
In [29], a dual notch microwave sensor based on Microstrip Transmission Line (MTL) and two Split-Ring Resonators (SRRs) is presented that is operating at 2.34 GHz and 2.74 GHz, and a maximum Q factor of 137 is achieved
In [31], a dual notch microwave sensor based on MTL and two Complementary Split-Ring Resonators (CSRRs) is designed to operate at 2.22 GHz and 2.46 GHz, VOLUME 9, 2021
Summary
Material characterization technologies play a very vital role in various scientific fields [1]-[3]. Measuring structural/operational vitals of a system in an industry [5], [6] and understanding the composition of a material and/or chemical [7], [8] These technologies play a significant role in biomedical research [9], [10], such as neural recording [11], glucose monitoring [12], and intracranial pressure monitoring [13]. In [29], a dual notch microwave sensor based on MTL and two SRRs is presented that is operating at 2.34 GHz and 2.74 GHz, and a maximum Q factor of 137 is achieved.
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