研究目的
To design and analyze an X/Ku dual-band single-layer reflectarray antenna with separate feeds, achieving high gain and efficiency in both bands.
研究成果
The proposed dual-band single-layer reflectarray antenna achieves high gains of 22.9 dBi and 28.8 dBi with aperture efficiencies of 40% and 44.8% at 8.5GHz and 16GHz, respectively, and wide 1-dB gain bandwidths. It demonstrates feasibility for multi-frequency applications with independent phase control and low cross-polarization.
研究不足
The phase shift curves are primarily for normal incidence, with slight changes for oblique incidence; discrepancies in measurement patterns may be due to permittivity deviation, noise in the anechoic chamber, and scattering from metal components.
1：Experimental Design and Method Selection:
The reflectarray antenna is designed using a single-layer configuration with elements composed of a split ring and a phoenix patch for dual-band operation. Ansoft HFSS software is used for simulation with master-slave boundary conditions to model an infinite array.
2：Sample Selection and Data Sources:
A prototype reflectarray with 225 elements of size 15mm x 15mm is fabricated and measured.
3：List of Experimental Equipment and Materials:
Dielectric substrate with εr=
4：5, thickness h1=1mm, loss tangent δ=002, air layer of 2mm, pyramid horn feeds with aperture dimensions 37mm*47mm for X-band and 78mm*101mm for Ku-band. Experimental Procedures and Operational Workflow:
The reflectarray is designed by calculating phase compensation for each element based on rotation angle of phase delay lines and position of inner loop, fabricated, and measured in a microwave anechoic chamber.
5：Data Analysis Methods:
Simulation and measurement results for radiation patterns, gain, aperture efficiency, and bandwidth are compared using HFSS software and standard measurement techniques.
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