Miniaturized Four-Element Antenna with Defected Ground and High Isolation

This paper proposes a miniaturized four-element antenna with defected ground and high isolation. Four modified microstrip-fed with rectangular radiators on the top plane with modified ground structure provides a band from 4.35 GHz - 5.53 GHz and is also responsible for size miniaturization and compactness with the overall size of 32 mm x 32 mm. Orthogonal placement of antenna elements increases the isolation where tilted square-shaped stub in the center of ground further reduces the mutual coupling up to 21.7 dB by diminishing the coupling between the orthogonally placed antenna. The results of ECC, DG, CCL and TARC provides overall good pattern diversity performances which represent the antenna is suitable for wireless communications.