Polyimide (PI)- Thin Film Based Holographic Metasurface Leaky Wave Antenna

In this paper, a metasurface based on the holographic principle is implemented to design a leaky wave antenna. The thin film polyimide (PI) having a thickness of 50μm (Dk = 3.05, Df = 0.008) is employed to develop the holographic metasurface. The proposed antenna is a multilayered structure, below the metasurface layer there is an adhesive layer of 40 μm (Dk = 6, Df = 0.004), then the bottom layer is the Rogers RT 5880 (Dk = 2.20, Df = 0.0009) grounded substrate of 1.6 mm. By the implementation of the proposed metasurface, the omnidirectional monopole is converted to the directional leaky wave antenna with beam steering at ɵ = 90
^o
in addition to enhanced gain and S
11
values for the 15 GHz band.