Harnessing Coupled Resonances in Dielectric Resonator Array for Strong Evanescent Fields

This letter delves into the analysis of near-field power attributes of dielectric resonator antenna arrays and compares it with that of conventional planar patch antenna arrays for operation at millimeter-wave frequencies. The study introduces the principle of resonant coupling among the elements of closely packed array of dielectric resonators, which compares to a nonlinear power profile in the linear array without the use of unequal excitation coefficients. This yields significant evanescent energy enhancement in near-distances of the array. The near-field power profile measurements are performed in an X-band frequency-scaled prototype for concept validation. The research conclusions highlight the relevance of coupled dielectric arrays in near-field application scenarios involving wireless power transfer, sensing, and imaging.