In this paper, a novel compact T-shape defected ground structure (DGS) is proposed in order to reduce the mutual coupling between elements in a microstrip antenna array structure. The proposed DGS has considerable advantages compared to an H-shaped DGS. As is known, DGS insertion is a common problem in microstrip antenna array structures. However, the proposed T-shaped structure is more compact so it could be suitable for a compact microstrip array antenna. The T-shaped DGS is about 24% more compact than the H-shaped one. However, the most important novelty of our work is reducing mutual coupling both in the E-plane and the H-plane, which previously was discussed just in the E-plane. Finally, we have considered the disturbing effect of mutual coupling on the side lobe level (SLL) of unequally spaced arrays; using these results, a T-shaped DGS has been implemented in an 8-element unequally spaced array antenna in order to reduce its SLL.
Defected ground structures, mutual coupling, surface waves, side lobe level, unequally spaced array antenna
VEISEE, SOROUSH; HEDAYATI, MAHSA KESHAVARZ; and ASADI, SHAHROOZ
"A novel compact defected ground structure and its application in mutual coupling reduction of a microstrip antenna,"
Turkish Journal of Electrical Engineering and Computer Sciences: Vol. 24:
5, Article 26.
Available at: https://journals.tubitak.gov.tr/elektrik/vol24/iss5/26