研究目的
To present an efficient technique for enhancing the aperture efficiency and the bandwidth of a Fresnel lens antenna by smoothly compensating the phase of the spherical phase front arriving from the primary source.
研究成果
The smooth Fresnel lens antenna demonstrates high aperture efficiency and wide bandwidth behavior, validated by measurements showing a maximum gain of 38.9dBi and a -2dB radiation frequency bandwidth of 29GHz around 90GHz. The technological process allows for the control of permittivity in a unique foam material, enabling the design of high-performance millimeter-wave antennas.
研究不足
The manufacturing process requires precise control of the foam material's thickness and permittivity, which may be challenging at higher frequencies. The initial thickness of the commercial foam was limited, necessitating the stacking of sub-lenses to achieve the desired lens thickness.
1：Experimental Design and Method Selection:
The study focuses on the design of a Fresnel lens antenna with smooth phase correction to improve efficiency and bandwidth. The phase compensation is achieved through the use of a variable and controlled permittivity obtained from a unique foam material.
2：Sample Selection and Data Sources:
The lens is manufactured using AirexR82 foam material, with permittivity controlled by pressing the material to achieve the desired thickness ratio.
3：List of Experimental Equipment and Materials:
AirexR82 foam material, hydraulic heat press machine, elliptical horn antenna, Compact Antenna Test Range (CATR).
4：Experimental Procedures and Operational Workflow:
The lens is manufactured by pressing the foam material to achieve the desired permittivity values, then assembled and tested with an optimized horn antenna in a CATR.
5：Data Analysis Methods:
The performance of the lens is evaluated through measurements of gain, radiation patterns, and bandwidth.
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