研究目的
To design an ultra wideband Vivaldi antenna array based on tightly coupled effect for achieving impedance matching at low frequency.
研究成果
The designed ultra wideband Vivaldi antenna array achieves impedance matching at low frequency through tightly coupled effect, with a bandwidth of 0.4GHz-4.2GHz. However, attenuation at high frequency suggests areas for further optimization.
研究不足
The measured result has great attenuation at high frequency, possibly caused by mechanical manufacturing errors, coaxial-cable attenuation, or excitation source synchronism.
1：Experimental Design and Method Selection:
The study employs the tightly coupled effect for designing an ultra wideband Vivaldi antenna array. The elements are arranged to overlap, introducing an additional capacitive capacity for impedance matching at low frequencies.
2：Sample Selection and Data Sources:
A 4×4 Vivaldi antenna array is simulated, fabricated, and tested.
3：List of Experimental Equipment and Materials:
The antenna elements are printed on an FR4 substrate with a relative permittivity of
4：55 and a thickness of 1mm. Experimental Procedures and Operational Workflow:
The Vivaldi antenna element was simulated using electromagnetic simulator CST, excited by a wave port with 1W power, and placed in periodic boundary to simulate an infinite array condition.
5：Data Analysis Methods:
The performance is evaluated through S11 parameters, farfield distributions, and efficiency measurements.
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