A novel design for high gain lens antennas with homogeneous media

A high gain lens antenna is designed by using a new transformation different from the discrete optical transformation. The antenna is composed of two blocks. Each block is made of homogenous and anisotropic materials, and thus can be easily achieved by metamaterial. The numerical results based on full wave simulation indicate that the antenna can be used to realize highly directive radiation beam, and the direction of radiation beam can be controlled artificially by changing the geometry parameters of the device. The electromagnetic field in the transformation region can be either stretched or compressed along both transverse and longitudinal directions by varying the geometry parameters in the virtual space while the distribution of electromagnetic field outside the antenna is little influenced. Moreover, effective medium theory is applied to realize such an antenna with isotropic materials. Also, the multi-beams antenna is investigated. It is indicated that this antenna can generate multi-collimated beams radiating at the desired angles.