研究目的
To improve the bandwidth of transmitarray antennas using a tapered transmission line approach.
研究成果
The proposed tapered matching approach significantly enhances the bandwidth of transmitarray antennas, achieving a 1-dB gain bandwidth of 27.4% for a 15λ × 15λ TA. The method presents a valid alternative for developing wideband transmitarray antennas based on dielectric substrates, with potential for easy manufacturing using Additive Manufacturing techniques.
研究不足
The study is based on simulation results, and the practical implementation and measurement of a prototype are pending. The effectiveness of the proposed method in real-world applications needs further validation.
1：Experimental Design and Method Selection:
The study introduces a novel three-layer perforated dielectric unit-cell with a central layer featuring a varying size square hole and two linearly tapered matching layers. The design is validated through simulation of a wideband transmitarray composed of 60x60 elements working in Ka-band.
2：Sample Selection and Data Sources:
The unit-cell is embedded in a periodic lattice to determine the magnitude and phase of the transmission coefficient as a function of the hole's diameter d, for several frequencies in the band of interest.
3：List of Experimental Equipment and Materials:
The chosen material is RT-Duroid 6006 with a permittivity of εr = 6.15 and tanδ = 0.0027. The square lattice periodicity is W = λ0/4 = 2.5 mm, where λ0 is the wavelength at f0 = 30 GHz.
4：15 and tanδ = The square lattice periodicity is W = λ0/4 = 5 mm, where λ0 is the wavelength at f0 = 30 GHz.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The unit-cell simulations were carried out using CST Microwave Studio. The structure is surrounded by periodic boundaries to obtain the infinite array condition, while absorbing boundaries are set near the port 1 and
5：Data Analysis Methods:
The behavior of the transmission coefficient amplitude and phase with d is analyzed to ensure good matching and a phase range of 360°.
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