This paper introduces a novel technique to enhance the gain of the basic monopole antenna by using broadband gradient refractive index (GRIN) metamaterial.The proposed GRIN is designed by using a parallel-line unit cell metamaterial probios intelliflora for dogs with different refractive index.A seven GRIN lens is placed on the omnidirectional printed basic monopole antenna, perpendicularly.
Due to the non-resonant and subwavelength properties of the parallel-line elements, the proposed GRIN metamaterial lens has a broad bandwidth property with low loss.The simulation and measurement results confirmed that the beam is more directive with narrow beam width.The measured reflection coefficient of the GRIN antenna is below -10 dB over the chorulon hcg frequency bandwidth of 3.
4-11 GHz.Due to GRIN lens, the peak gain of the basic monopole antenna is increased by 5.3 dB at 8.
8 GHz.