TRANSPARENT DIELECTRIC RESONATOR REFLECTARRAY WITH BOTTOM-LOADING STRIP

A transparent dielectric resonator (DR) reflectarray that works in the C-band (6.5GHz) is proposed in this paper. Here, the reflectarray element has a metallic strip of adjustable length placed underneath to act as a phase shifter. Floquet method is applied for characterizing the reflection properties of the element and a 7 × 7 full-fledge reflectarray was constructed using glass and the low-cost FR4. By varying the length of the under-loading strip, it is found that the proposed DRA reflectarray element is able to provide a compensating phase of greater than 300◦. Measurements and simulations were conducted to analyze the reflection coefficient, antenna gain, and radiation patterns. The reflectarray has a maximum gain of 14.38 dBi in the broadside direction, and the 1-dB bandwidth of the DRA reflectarray is found to be around 8%. The use of DR has enabled antenna size miniaturization, and it can be useful for the design of small-size reflectarrays.