Aligned-gap multiple split ring resonator for dielectric sensing application

Abstract

This paper presents the design and development of planar Aligned-Gap Multiple Split Ring Resonator (SRR) for microwave sensor that operates at resonance frequency around 5 GHz. The sensor consists of a microstrip transmission line loaded with two elements of Aligned-Gap Multiple Split Ring Resonator (SRR) on both sides. The proposed sensor was designed and fabricated on Rogers RT5880 substrate having dielectric constant of 2.2 and thickness of 0.254 mm. The final dimension of the proposed sensor was measured at 30 × 15 mm2. Measured result show good agreement with simulated ones as well as exhibiting high Qfactor for use in sensing application. An obvious shift of resonance frequency is observed upon introduction of several samples with different dielectric value.

Planar Microwave Sensors for Accurate Measurement of Material Characterization: A Review

“…The first study by [66], differentiated the design of sensor-aligned and center-gap gap studied to get the high Q factor and the permittivity of some solid samples such as FR4, Duroid RT 5880 and Rexolite. It was also carried out by the second study [67] by using the same sensor that measured the permittivity of liquid samples such as rexolite, ethanol, methanol and water with good quality factor of 130. A new technique has been introduced by [68] using a Split Ring Resonator (SRR) to determine the relative permittivity characterization of liquid and solid, and determine the solid thickness of materials below 2 GHz.…”