研究目的
To present a novel nematic liquid crystal (LC) technology-based electronically controlled leaky wave antenna (LWA) with microstrip-waveguide conversion working mechanism and wide beam steering range.
研究成果
The electronically controlled beam steering LWA based on nematic LC materials has been successfully designed and fabricated, achieving a scanning range of the main beam direction at 12 GHz of 32°. The LWA features simple structure, is easy to implement, and holds significant advantages in practical applications. The results suggest the great potential of nematic LC materials for extensive applications in microwave band in the future.
研究不足
The LC materials are hard to be implanted in devices during design, manufacture, and device packaging due to their fluidity biophysical state. The stability of glass is poor, making it difficult to be widely applied on equipments with requirements of high stability. The tunable range of LC-based antenna is wide in millimeter wave and THz band, but in relatively low frequency band, the LWA based on LC cannot achieve satisfactory scanning range.
1：Experimental Design and Method Selection:
The LWA is designed as a combination of an inverted microstrip structure and rectangular waveguide, utilizing the characteristics of LC materials in the microwave band. A broadband microstrip-waveguide conversion device is proposed. The gradient slot leaky wave structure is combined with the microstrip-waveguide conversion device to form an electronically controlled LWA with continuous tunable beam.
2：Sample Selection and Data Sources:
The LC material used is TUD-649 produced by Merck Corporation, with dielectric anisotropy properties. The substrate is Rogers 4350B.
3：0B.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The experiment utilizes a Vector Network Analyzer (VNA) Agilent N5227A for feeding the LC-LWA, and a horn antenna as a receiving antenna. The LC material is BAYI LC Limited model CDZSL-
4：Experimental Procedures and Operational Workflow:
0 The RF signal is fed into the microstrip line through the port and coupled into the waveguide. The bias voltage is loaded on the microstrip lines and the rectangular waveguide to deflect the direction of LC molecules. The performance of the LWA is verified through simulation and experiment.
5：Data Analysis Methods:
The performance of the LWA is analyzed based on the beam scanning range, impedance matching, and gain stability at 12 GHz.
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