
A Miniaturized Broadband Planar Lens Antenna with High Transmittance Based on Fractal Metasurface
MA Li-na, GU Chang-zhan, ZHOU Ling-yun, MAO Jun-fa
ACTA ELECTRONICA SINICA ›› 2022, Vol. 50 ›› Issue (12) : 3003-3013.
A Miniaturized Broadband Planar Lens Antenna with High Transmittance Based on Fractal Metasurface
In this paper, a miniaturized broadband planar lens antenna(PLA) with high transmittance based on fractal transmissive metasurface elements is proposed at the X band. In order to achieve the characteristics of broadband and high transmission, units of PLA are designed based on the concept of antenna-filter-antenna(AFA) which satisfies butterworth response. Fractal geometries and stacked structures are used to expand bandwidth as well as realize miniaturization. Two kinds of structures are designed combining patches back-to-back and a cross-shaped slot or a double cross-shaped slot etched on the common ground plane. The unit-cell periodicity is just 4.5 mm(0.15λ0). In order to validate features of units, prototypes of two kinds of frequency selective surfaces(FSSs) which consist of the same proposed units are designed, simulated, manufactured and measured. Presented FSSs possess bandwidths of 40% and 64%, which are corresponding to 3 dB bandwidths for both reflection(S11) and transmission coefficients(S21) at an incident angle within 60°. To satisfy the transmission phase of the unit whose range is from 0° to 360° within the variable size and further enhance the efficiency of the PLA, a seven-layer element based on the improved abovementioned unit is proposed. Equivalent circuits are calculated and simulated to verify the correctness of the structure. A prototype of the proposed PLA is designed and simulated. The simulation results show that the PLA provides a maximum gain of 12.5 dBi, which is 5.25 dB higher than the feeding antenna over a wide bandwidth(20%) and a high aperture efficiency(up to 78%). These show that the PLA has good radiation characteristics.
broadband / miniaturized / high transmittance / planar lens antenna / fractal / metasurface {{custom_keyword}} /
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