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Circularly Polarized Vivaldi Antennas Integrated with Septum-like Polarizer
Ilkyu Kim1, Sun-Gyu Lee2, Yong-Hyun Nam3
1Department of Electrical and Electronics Engineering, Sejong Cyber University, Seoul 05000, Republic of Korea.
Sensors (Basel, Switzerland)
|July 13, 2024
Summary
This study introduces a novel septum polarizer for Vivaldi antennas, enabling efficient generation of circular polarized (CP) waves. This innovative design minimizes signal loss, enhancing antenna performance for various applications.
Area of Science:
- Electromagnetics and Antenna Engineering
- Microwave Engineering
- Wave Propagation
Background:
- Septum polarizers offer a simple and effective method for generating high-quality circular polarized (CP) waves.
- Traditional applications of septum polarizers are primarily in waveguides.
- Substrate Integrated Vivaldi antennas are increasingly important for modern communication systems.
Purpose of the Study:
- To demonstrate the novel application of a septum polarizer with a substrate integrated Vivaldi antenna for CP wave generation.
- To optimize the polarizer design for equal amplitude and phase difference between orthogonal electric fields.
- To mitigate signal loss typically associated with electronic phase shifters.
Main Methods:
- Integration of a pulse train-shaped septum polarizer onto a Vivaldi antenna.
- Optimization of polarizer contours using a genetic algorithm.
- Fabrication and experimental validation of the antenna prototype, including radiation pattern and impedance matching measurements.
Main Results:
- Successful demonstration of a septum polarizer integrated with a substrate integrated Vivaldi antenna for CP wave generation.
- Genetic algorithm optimization achieved the desired equal amplitude and 90° phase difference.
- Experimental results closely matched simulated performance, validating the design.
Conclusions:
- The presented septum polarizer is a viable and effective component for generating CP waves with substrate integrated Vivaldi antennas.
- This approach offers a significant advantage by reducing or eliminating losses from conventional electronic feed networks.
- The findings pave the way for improved CP antenna designs in various wireless communication systems.
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