Liquid crystal based high-isolation power splitter and phase shifter

By using a liquid crystal-based high-isolation power divider phase shifter, leveraging the electrical tunability of liquid crystal and substrate-integrated waveguide structure, the control accuracy and loss problems of existing phase shifters in the high-frequency band are solved, achieving high isolation and miniaturization, and improving the performance of phased array antennas.

CN117638434BActive Publication Date: 2026-07-24UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Filing Date
2023-12-13
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing phase shifters suffer from low control accuracy, high cost, high loss, and beam leakage in the high-frequency band, making it difficult to meet the requirements of high-frequency phased array antennas.

Method used

A high-isolation power divider phase shifter based on liquid crystal is adopted. Through the design of liquid crystal layer and bias control layer, the dielectric constant is changed by utilizing the electrical tunability of liquid crystal. Combined with substrate integrated waveguide structure and metallized vias, continuous phase modulation and high isolation are achieved.

Benefits of technology

It achieves continuously adjustable phase, low loss, high port isolation, and miniaturized structure, solves the beam leakage problem in the high-frequency band, and improves the performance of phased array antennas.

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Abstract

The application relates to a high-isolation liquid-crystal-based power-division phase shifter, belonging to the technical field of communication, which comprises a power-division phase-shifting layer, a liquid crystal layer and a bias control layer, an upper ground is arranged above the power-division phase-shifting layer, the liquid crystal layer is arranged below the power-division phase-shifting layer, and a lower ground is arranged between the liquid crystal layer and the bias control layer; the two ends of the power-division phase-shifting layer are respectively connected with an input end and an output end, the bias control layer is connected with a PFGA control, the forward voltage of the bias control layer is fed to the liquid crystal in the liquid crystal layer by being applied to the lower ground, the voltage size of the bias control layer is controlled by the FPGA, then the effective dielectric constant of the bias control liquid crystal is controlled, the capacitance value is changed, then the phase shift constant of the electromagnetic wave is changed, and the phase shift purpose is achieved. The application applies the bias voltage below the microstrip transmission line, not only reduces the wave beam leakage problem caused by the coupling and the direct-current blocking capacitor, but also omits the choke and the direct-current blocking capacitor design, and realizes the miniaturization of the overall structure.
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