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A Circularly Polarized Non-Resonant Slotted Waveguide Antenna Array for Wide-Angle Scanning.
1The 54th Research Institute of China Electronics Technology Group Corporation, Shijiazhuang 050081, China.
Sensors (Basel, Switzerland)
|May 25, 2024
Summary
This study presents a compact circularly polarized waveguide antenna array for wide-angle electronic scanning. The novel design achieves a broad scanning range with low side-lobes, ideal for cost-effective radar systems.
Area of Science:
- Electromagnetics and Wave Propagation
- Antenna Theory and Design
- Microwave Engineering
Background:
- Traditional circularly polarized arrays face limitations in scanning range and cost.
- Achieving wide-angle electronic scanning with low side-lobes in compact arrays is a significant challenge.
Purpose of the Study:
- To propose a compact, non-resonant slotted waveguide antenna array.
- To achieve wide-angle scanning, circular polarization, and low side-lobe levels.
- To demonstrate advantages for low-cost, two-dimensional electronic scanning arrays.
Main Methods:
- Utilized a compact element design reducing aperture area by 50%.
- Employed staggered array configuration for reduced element spacing (0.57λ).
- Incorporated isolation gaps for enhanced circular polarization and Taylor synthesis for low side-lobes.
Main Results:
- Demonstrated a beam scanning range of -45° to +45° in the phase domain.
- Achieved superior radiation efficiency and favorable VSWR.
- Maintained an axis ratio below 3 dB across the scanning range.
Conclusions:
- The proposed antenna design offers significant advantages for low-cost, wide-angle scanning circularly polarized arrays.
- The methodology effectively broadens the beam scanning angle of such antennas.
- The compact, non-resonant design with enhanced polarization performance is suitable for advanced radar applications.
