A 2 × 2 Compact and Portable UWB MIMO Dielectric Resonator Antenna (DRA) for Future Mobile Handset with Improved Diversity and Isolation Level

In current research article, a double-port microstrip fed dielectric resonator antenna (DRA) with defective ground structure (DGS) is designed and experimentally tested for future Smart phones. The structure of the design comprises two identical dense microstrip-fed that is located symmetrically at dissimilar edge corners of the Smartphone main board. The proposed DRA array is designed on FR-4 substrates with total dimensions of 23 × 54 × 1.57 mm3. The top and bottom layers of this substrate consists of two L-shaped microstrip fed networks and an aeroplane shaped DGS respectively. Initially a single input single output (SISO) rectangular dielectric resonator of alumina material is placed over the respective feed network which is changed to an inverted L-shaped DR to enhance the bandwidth of antenna. After that, a 2 × 2 array is formed from the SISO mentioned above and two aeroplane shaped DGS are introduced on surface of the ground plane in order to attain the desired impedance bandwidth i.e. 6.3–12.6 GHz. That helps to provide a maximum gain of 4.5 dB at 7.6 GHz frequency with high isolation value i.e. S21 ≤ − 22.5 dB.