Design of multiband stub loaded oval ring patch antenna with serpentine shaped EBG for C- and K_u-band communications

Electromagnetic Bandgap structures (EBG) are used along with patch antennas due to their ability to reduce the size of the antennas and enhance the performance parameters of the patch antennas. Many shapes of EBG are proposed in the recent times to meet the needs of wireless technologies in the future. This paper proposes a stub loaded oval ring patch antenna mounted on a serpentine shaped EBG ground. The patch antenna possesses dimensions of $18\times 18\times 0.8\text{mm}^{3}$. Miniaturization of 89.1% is achieved with the proposed antenna structure. The proposed patch antenna resonates at 4.28GHz, 6.15GHz, 6.78GHz and 12.15GHz. Peak gains of 1.1dBi, 1.3dBi, 2.8dBi and 2dBi are observed at 4.28GHz, 6.15GHz, 6.78GHz and 12.15GHz respectively. Bidirectional radiation patterns are observed at 4.28GHz, 6.15GHz, 6.78GHz and 12.15GHz. The radiation patterns are observed to be stable at the resonant frequencies.