Three-bit Unit-cell with Low Profile for X-Band Linearly Polarized Transmitarrays
Keywords:
Cut-ring patch, reflectarray, ring slot, transmitarray, unit-cell designAbstract
In this paper, we present a three-bit phase resolution and low profile unit-cell structure for X-band passive transmitarrays. The unit-cell is implemented using four metallic layers printed on two substrates separated by an air gap. The phase shift is achieved by a combination between current flow modification on middle layers and the variation of the size of path elements. Eight unit-cells are optimized to provide eight phase states with a step of 45°. Experimental results are conducted by using WR-90 waveguide to validate the design. These eight unit-cells cover a wide -3 dB transmission bandwidth of 15% and exhibit a low thickness of 0.18λ0.
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