研究目的
Investigating the design methodology of three-dimensional (3-D) passive metallic waveguide-array lens antenna (MWALA) by implementing the Rotman lens concept (RLC) for collinear multi-beam radiations on the same angular plane.
研究成果
This paper presents a design approach of MWALA based on a conceptual extension of Rotman lens to determine the bottom surface pro?les. Theoretical mathematic formulations and practical design procedure have been developed and presented for easy implementation. Practical demonstration examples with their characteristics of radiation obtained from numerical HFSS simulations have been presented, which are further validated by measured results of a MWALA prototype.
研究不足
The mutual coupling between array elements appears significant influence on the gain performance, whose reduction will be investigated in the future phases.
1：Experimental Design and Method Selection:
The methodology extends the original concept of two-dimensional (2-D) tri-focal Rotman lens into a 3-D one in free space.
2：Sample Selection and Data Sources:
The MWALA has a planar aperture facing to the radiation boresight and a curved focal surface pro?le (CFSP) on the opposite side to receive the illumination by the radiations of feed antennas.
3：List of Experimental Equipment and Materials:
The design employs waveguide elements whose shapes of cross-section can be shaped to control the XPLs.
4：Experimental Procedures and Operational Workflow:
The CFSP is determined by building up a set of three linear phase equations according to three designated focal points on the CFA for the 3-D Rotman lens.
5：Data Analysis Methods:
Numerical and experimental examples are presented to validate the feasibility.
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