研究目的
To design a wideband all-metal Vivaldi phased array antenna that overcomes the disadvantages of conventional printed circuit Vivaldi antennas, such as microstrip loss, complex installation, and low structural strength, and to achieve good performance in the 6-12 GHz band with wide scanning angle capabilities.
研究成果
The all-metal Vivaldi phased array antenna successfully achieves wideband operation (6-12 GHz) with VSWR less than 2.5 and scanning angles up to 45 degrees. It offers advantages over printed versions, including higher structural strength, simpler processing, and suitability for complex environments, making it applicable in radar and electronic countermeasures.
研究不足
The antenna may exhibit grating lobes at large scanning angles (e.g., 45 degrees at 12 GHz) due to element spacing, and the AVSWR performance varies with element location in the array, with center elements performing better than edge elements.
1：Experimental Design and Method Selection:
The antenna design is based on all-metal Vivaldi elements arranged in a line array with virtual elements at the ends to simulate an array environment. Simulation is performed using HFSS software to model and optimize the antenna parameters.
2：Sample Selection and Data Sources:
The antenna is fabricated from aluminum material using wire-electrode cutting. Measurements are conducted in a dark room to obtain S-parameters and radiation patterns.
3：List of Experimental Equipment and Materials:
Aluminum material for antenna fabrication, SMA connectors, matched loads for virtual elements, and measurement equipment in a dark room.
4：Experimental Procedures and Operational Workflow:
Design the antenna unit with specific parameters (e.g., slot dimensions), simulate the unit and array in HFSS, fabricate the antenna, measure S-parameters and patterns in the dark room, and analyze data using microwave network theory.
5：Data Analysis Methods:
Active VSWR is calculated from S-parameters using formula (2), and radiation patterns are derived from measured amplitude and phase patterns using formula (3).
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