研究目的
To minimize radome effects in monopulse arrays using a convex optimization approach that utilizes active element patterns to determine the excitation weights.
研究成果
The paper demonstrates that introducing the radome increased the side-lobe level from ?20.0 dB to ?17.5 dB. By taking the radome effects into account in the optimization, a side-lobe level of ?20.1 dB could be achieved. Compared to optimization carried out for the array factor, the optimization with AEPs resulted in 3.5 dB lower side-lobe level. The presented approach also increases the sum-pattern gain in the scan direction.
研究不足
The method's robustness with respect to a wide bandwidth and implementation with discrete phase states needs further investigation.
1：Experimental Design and Method Selection:
A convex optimization approach is implemented with active element patterns (AEPs) to compensate for radome effects. The optimization problem is defined for three simultaneous monopulse patterns, taking into account edge effects, mutual coupling, mismatch, losses, and radome effects.
2：Sample Selection and Data Sources:
Simulation results are presented for a BoR array with 48 elements and an extended hemispherical radome at 20 GHz.
3：List of Experimental Equipment and Materials:
The radome is made from polymide quartz with a uniform thickness of 7.5 mm. The array consists of 8 × 6 antenna elements of vertical polarization.
4：5 mm. The array consists of 8 × 6 antenna elements of vertical polarization.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The AEPs are computed for each antenna element using the finite integration technique (FIT) implemented in CST Microwave Studio, with all other elements terminated in 50 Ω loads.
5：Data Analysis Methods:
The optimization problem is solved using the CVX convex optimization tool, with the objective to minimize the maximum side-lobe level for a set of known AEPs.
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