Miniaturized differential dual circularly polarized traveling wave dielectric resonator antenna array with high ports isolation

The present study presents a differential traveling wave series-fed dielectric resonator antenna (DRA) array with dual circularly polarized (DCP) operating for IEEE 802.11a applications. To possess circular polarization (CP) fields, a unique antenna element composed of rectangular dielectric resonators (RDR) coupled with octagonal slots (OS) at the ground plane and excited by the mean of a microstrip feed at the front plane is proposed. The proposed resonating element generates two orthogonal modes, TEδ 2 1ˣ T E δ 21 x and TE\ 1 δ 1ʸ T E 1 δ 1 y , ensuring the existence of CP performance. To obtain a DCP performance, the proposed resonator is utilized for portraying a seven-element array employing a concentric ring fed with dual differential port excitation. The concentric ring fed allows choosing the direction of the input wave and, accordingly, the orientation of the CP. Hence, synchronous feeding to both ports yields in generating waves of various polarization states. The 50 × 50 50 × 50 mm ² 2 array exhibits an resonance bandwidth of 12.15% with an polarization purity of 12.5%. Meanwhile, the inter-port isolation varies from -18 dB to -39 dB along the resonance band. The realized measured gain ranges from 11.33 to 12.44 dBi. The proposed array exhibits DCP capability, and therefore, it fits for various applications.