研究目的
To demonstrate the dielectric properties of a nematic state liquid crystal could be exploited to realize a slot unit cell phase shifter for the reconfigurable reflectarrays antennas.
研究成果
The presented LC-based phase shifter has potential applications in the millimeter and terahertz reconfigurable reflectarrays. The phase shifter with the printed unit cell provided a phase range greater than 300? within a 3.6% bandwidth for typical values of LC anisotropy.
研究不足
The device was not an infinite periodic structure as it was in the simulation, so there might be some effects caused by the boundary conditions. There were finite fabrication tolerances. The assumption of isotropy and homogeneity for each state of the relative permittivity of the LC in the cell might produce a small interfering resonance within the reflected field.
1：Experimental Design and Method Selection:
The phase shifter was designed using a single slot unit cell and liquid crystal for a reconfigurable reflectarray antenna. The dielectric properties of a nematic state liquid crystal were exploited to realize the phase shifter.
2：Sample Selection and Data Sources:
The prototype was fabricated by the ultraviolet light photoetching combined with the wet etching. The sample consisted of a 30 × 30 unit cells, printed on the 40 × 40 mm2 area on a quartz substrate.
3：List of Experimental Equipment and Materials:
An Agilent N5224A vector network analyzer with N5262AW08 extender was used to measure the spectral response of the fabricated structure. The LC mixture (HFUT-HB01) was used in simulation and design.
4：Experimental Procedures and Operational Workflow:
The free space measurements were used to obtain the scattering parameters in the frequency range from 110 to 140 GHz. A 1 kHz square wave with the maximum voltage of 10 V was energized between the ground and patches.
5：Data Analysis Methods:
The simulation and experimental results were compared to evaluate the proposed structure.
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