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Article Abstract
This paper presents the design of a multi-beam reflectarray antenna sensor for medical and biosensing applications. The design incorporates a microstrip antenna with a rectangular graphene patch to feed the reflectarray antenna. This array antenna includes 76 rectangular graphene sheets placed beneath a substrate and atop an analyte substrate layer for environmental sensing. The key innovation lies in the creation of a directional multi-beam antenna. By adjusting the graphene's chemical potential, the antenna can radiate in multiple directions, enhancing channel capacity. The reflection spectra are obtained for several graphene chemical potentials, and the refractive index of the structure's sensing layer is in the range of 1.1-1.6. The antenna operates at a specific frequency band between 1.03 and 2.38 THz, at best, equal to 79% of the fractional bandwidth. It is shown that a sensitivity of 0.18 THz/RIU is achieved at a refractive index of 1.5 and a chemical potential of state 2.
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