Abstract
In this letter, a two-sectioned metamaterial medium is designed to provide two different effective refractive indices in each of its parts. This metamaterial is integrated on the substrate in front of a printed dipole antenna to provide a low-profile technique for tilting the antenna beam that operates at the frequency of 60 GHz. Using this technique, a tilt angle of 32 ° in the E-plane is achieved and, unlike the other conventional methods, the gain does not drop while the beam is tilted, and in fact a gain enhancement of 2.4 dB is observed. The presented metamaterial section does not affect the antenna matching and bandwidth over the frequency range of 57-64 GHz. To verify the simulation results, the antenna has been fabricated and measured.
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