Dual-linearly polarized dielectric resonator antenna array for L and S band applications

In this paper, a 2×2 cylindrical dielectric resonator antenna (DRA) array, where each element is excited by a slot orthogonally placed to a strip fed probe is presented. The proposed design is showing dual linear polarization with high isolation exceeding 36 dB in L-band and 40 dB in S-band operations respectively. The HEM111 and HEM113 modes have been considered to generate dual mode in cylindrical DRA to yield broadside radiation pattern. To reduce the merging of two DRA modes because of strip fed excitation the DRA radius is slightly increased from calculated value. The co-polarization level in both planes is found to be nearly 35 dB higher than the cross-polarization in bore-sight direction. The proposed 2×2 cylindrical dielectric resonator antenna (DRA) array has been achieved -10 dB impedance bandwidth of 21% for 1.16 to 1.43 GHz (in L-Band) and 4.54% for 3.35 to 3.2 GHz(in S-Band) respectively. The radiation patterns with nearly same pattern shapes are found to be stable with the realized gains of 9.6 dB and 10.7 dB for resonant frequencies of 1.28 GHz and 3.3 GHz respectively.