研究目的
To design a wideband and wide-angle scanning phased array with large element spacing in a triangular lattice, overcoming scan blindness caused by leaky surface waves using electromagnetic band-gap structures.
研究成果
The proposed phased array with EBG structures successfully suppresses E-plane scan blindness, achieving wide bandwidth and wide scan angles up to ±60° in both E and H planes. Measurements validate the design, showing good agreement with simulations, though minor discrepancies exist due to experimental limitations.
研究不足
Truncation effects in the finite array cause impedance matching deterioration at low frequencies. Measurement inaccuracies arise from phase errors in S-parameters and limitations of the receiving horn's cross-polarization levels. The array size is small, leading to gain ripples and scan angle pointing errors.
1：Experimental Design and Method Selection:
The array is designed based on a connected backed-cavity antenna element in a triangular lattice. Electromagnetic band-gap (EBG) structures are used to suppress leaky surface waves. Full-wave simulations are conducted to optimize the design.
2：Sample Selection and Data Sources:
A 13×5-element finite array prototype is fabricated and tested. S-parameters are measured using an Agilent PNA E8363C network analyzer, and radiation patterns are measured in a far-field anechoic chamber.
3：List of Experimental Equipment and Materials:
Equipment includes an Agilent PNA E8363C network analyzer, a far-field anechoic chamber, and a receiving horn. Materials include aluminum ground plane, FR4-epoxy substrates, bonding layers, and microstrip lines.
4：Experimental Procedures and Operational Workflow:
The array is simulated using full-wave methods. The prototype is fabricated, and S-parameters are measured to calculate active VSWR. Radiation patterns are measured for various scan angles and frequencies.
5：Data Analysis Methods:
Active VSWR is calculated from measured S-parameters using summation formulas. Radiation patterns are normalized and compared to simulations. Gain and cross-polarization levels are analyzed.
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