Advances in material science and manufacturing make dielectric resonator antenna (DRA) technology a valid solution for the development of commercial array antennas. DRAs share several features with their counterpart, patch antennas; they are compact and easy to integrate with active electronics. However, DRAs are more efficient than patch antennas at mm-wave frequencies as they are not subject to conduction losses. In addition, DRAs can provide more design freedom, compared to patch antennas, in relation to the geometry and materials forming the basic dielectric resonating structure. It can be concluded that DRAs are compact, light-weight, and display broader bandwidth (BW) and more favorable radiation properties as compared to patch antennas.
In this work, we would like to share the outcome of The Antenna Company research and development program on antenna array solutions for 5G wireless communications. The proposed antenna array design is made of a low-loss engineered polymer material with high relative permittivity.
The antenna elements are fed by using aperture slots in a dedicated multilayered printed circuit board (PCB). The feeding structure and geometry of the dielectric resonators are optimized so to excite multiple electromagnetic modes in such a way as to achieve a wideband behavior. A special impedance transformer is implemented in order to
preserve optimal impedance matching properties while scanning. The antenna array is capable of steering the radiation beam up to 60 degrees in any plane with minimal scan losses. The total active radiation efficiency is larger than -2 dB along the E-Plane in the frequency range between 27.5 GHz and 29.5 GHz. Along the H-Plane the efficiency is better that -2dB in the frequency range between 24.5 GHz and 29.5 GHz