Design And Development Of Material Characterization Using Microwave Signal

Balan, Kavina Nishanthini (2018) Design And Development Of Material Characterization Using Microwave Signal. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Material characterization system is needed to characterize the dielectric properties of the materials. A free space transmission and reflection (T/R) material characterization system is designed to study dielectric properties of wood, FR-4, acrylic, polystyrene and cardboard box. The project started with designing the material characterization system where material placed in between two antennas which are connected to Vector Network Analyzer (VNA) through cables. For characterization purpose, 2x2 microstrip antenna array designed at the resonant frequency 2.4GHz and with gain of 6 dB and 100 MHz of bandwidth. Measurement process carried out in each position of the material and measurement data obtained in reflection coefficient (S11) and transmission coefficient (S2l) and analyzed using time-domain analysis. The calculated permittivity of five materials for S11 matches with reference value taken from reliable source. Wood material's calculated permittivity for the distance of 5cm is 2.7 falls within reference range 1.4-2.9 whereas for S21 is 3.8 do not match with it. On other hand, Radar Cross Section (RCS) analysis carried out using MATLAB visually observe the characterization of each material at range of frequencies. It can be concluded, the designed system can characterize material for S11 and S2l successfully for short range of distance only.

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