Investigations on flexible dielectric material-based wearable antenna for tumor detection

In this paper, the design and comparative evaluation of five distinct substrate materials with variable relative permittivity values (2.71, 1.65, 1.51, 1.36, and 1.05), namely Polydimethylsiloxane (PDMS), Jean, Cotton, Felt, and Foam. The performance of the microstrip patch antenna is largely dependent on the dielectric materials used as the substrate and the patch shapes. Two approaches are used to carry out the analysis: in the first, five substrates with identical dimensions are used on the antenna and different frequencies are obtained. It is observed that when the dielectric constant decreases the frequency of the antenna shift towards right side. In the second method, to obtain the same frequency (2.45 GHz ISM band) five substrates with different dimensions are used on the antenna. Though the dimensions of the antenna varies but the number of Faces, Edges, and Vertices are same. The proposed antenna design is simulated in HFSS and Fabricated using synthesized PDMS substrate. The field overlays difference between the healthy and tumor affected phantom depicts the presence of tumor.