研究目的
Investigating the feasibility of microwave liquid crystal based dielectric waveguide phased shifters in a phased rod antenna array for the first time.
研究成果
A continuously electrical steerable phased array at W-band frequencies using microwave liquid crystals is presented for the first time. The phase shifters achieved a maximum phase shift of 400? to 900? from 75GHz to 110GHz with an average Figure-of-Merit (FoM) of 130?/dB. Despite the simpli?ed electrode biasing network, beam steering is demonstrated, resulting in radiation towards 0?, ?25? and +15?.
研究不足
The assembly process of the single parts leads to fabrication tolerances, which affects the DW phase shifters. The electric biasing is limited to the parallel LC orientation, and the initial LC orientation in the unbiased state is very sensitive to the surface roughness of the milled Rexolite.
1：Experimental Design and Method Selection:
The phase shifters are designed as continuously tunable subwavelength fibers, partially filled with a newly specifically synthesized microwave liquid crystal. A 1 × 4 rod antenna array is designed including the phase shifters and a cascaded E-plane power divider network.
2：Sample Selection and Data Sources:
The LC mixture used is the new GT7-29001, specifically synthesized for microwave applications by Merck KGaA.
3：List of Experimental Equipment and Materials:
Rexolite with a permittivity of εr = 2.53 and a dissipation factor of tan δ = 0.0006 at 100GHz, LC GT7-29001, WR10 horn-like transitions, Keysight PNA including W-band extension modules from Anritsu.
4：53 and a dissipation factor of tan δ = 0006 at 100GHz, LC GT7-29001, WR10 horn-like transitions, Keysight PNA including W-band extension modules from Anritsu.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The phase shifters are assembled of two milled Rexolite halves, which are glued together using a ultraviolet glue. The LC is filled in with a syringe and the channel is sealed with epoxy glue. The phase shifter performance is characterized with magnetic and electric biasing.
5：Data Analysis Methods:
The phase shifter performance is evaluated regarding the simulated and measured scattering parameter |S21|. The FoM is defined as the ratio of maximum differential phase shift and maximum insertion loss.
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