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Design of a Double Resonance Sensor for Screening Materials

A double resonance microwave sensor is proposed to distinguish materials by their relative permittivities for quick screening in manufacturing, security and healthcare applications. Two distinct resonant frequencies are utilized as features in a two-dimensional vector space to classify materials. The sensor is designed with the waveguide analysis and by finite-element electromagnetics simulations to achieve desired parameters. The double resonance sensor can identify the relative permittivities of different organic and inorganic materials.