Modélisation et réalisation d’un capteur micro-onde à base de métamatériaux

Abstract

In this thesis, we present the design of a compact and highly sensitive microwave sensor based on a complementary fused ring resonator (CSRR) based on meta-material, for the characterization of liquid media in the microwave domain. The sensor design consists of a two-port microstrip-fed rectangular patch resonant structure printed on a 20×28mm2 Roger RO3035 substrate with a thickness of 0.75mm, a relative permittivity of 3.5 and a tangent loss of 0.0015. The CSRR resonator is installed on the ground plane in order to miniaturize the microwave sensor. The liquid sample under test is filled into a glass capillary tube placed parallel to the plane of the sensor surface. The placement of the capillary tube containing the liquid to be identified in parallel position improves the performance of our proposed sensor and achieves twice the value in terms of sensitivity and Q-factor compared to the performance of the original sensor (the test tube in vertical position) while maintaining the same tube radius. By folding the proposed structure, further improvements have been achieved by this significant transformation of the sensor from a planar to a cylindrical shape. These changes have led to a shift in the resonant frequency and the quality factor of the sensor. Therefore, we could increase the S sensitivity by more than 10 times compared to the original planar structure.