Dumbbell Shaped Defected Ground Structure High Gain Antenna for Dual Band Application
Keywords:High gain, dumbbell shape defected ground, dual band, bandwidth, return loss, compact antenna
Based on the traditional antennas with DGS, we have compared three similar circular DGS designs to find a better one in this
paper. Meanwhile, four T-shaped slots impedance transformer is used on the patch as a dual-band recouple to achieve dual-band technology. With the simulation, it is found that the antenna with three circular defects on the ground plane has better performances than the other two antennas. It has two resonant frequencies at 7.5GHz and 8.9GHz. The relative bandwidth is 3.33% and 3.94%, and the corresponding gain value is 9.45 dBi and 13.37dBi at two different resonance frequencies. Further, we obtained a higher gain, lower return loss and dual-band characteristics which can be used in the satellite communications.
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