A Novel Circularly Polarized Folded Transmitarray Antenna with Integrated Radiation and Scattering Performance.

Area of Science:

• Electromagnetics and Wave Propagation
• Antenna Theory and Design
• Microwave Engineering

Background:

• Transmitarray antennas are crucial for modern communication systems.
• Achieving wide axial ratio (AR) bandwidth in circularly polarized antennas remains a challenge.
• Existing design methods for CPFTAs can be complex and offer limited bandwidth.

Purpose of the Study:

• To introduce a novel design methodology for circularly polarized folded transmitarray antennas (CPFTAs).
• To improve the axial ratio (AR) bandwidth and reduce design complexity compared to general methods.
• To demonstrate integrated radiation and scattering control in CPFTAs.

Main Methods:

• Sequential rotation technology was applied to develop the novel CPFTA design.
• A general CPFTA (GCPFTA) and a novel CPFTA (NCPFTA) were designed and fabricated.
• Simulated and measured results were obtained for performance comparison.

Main Results:

• The novel design method significantly improved the AR bandwidth without additional structures.
• Simulated and measured results showed good agreement, validating the proposed method.
• The NCPFTA achieved broadband operation, high gain, and a low radar cross-section (RCS).

Conclusions:

• The proposed sequential rotation method offers a simplified and effective approach to CPFTA design.
• The novel CPFTA demonstrates superior performance, including enhanced bandwidth and integrated scattering control.
• The developed NCPFTA is suitable for mobile satellite communication applications due to its planar structure and low profile.