Circularly Polarized Broadband Printed Antenna for Wireless Applications

Area of Science:

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

Background:

• Circularly polarized (CP) antennas are crucial for mitigating polarization mismatch losses in wireless systems.
• Achieving wide bandwidth and good axial ratio simultaneously in printed antennas remains a design challenge.

Purpose of the Study:

• To design and develop a simple, compact sickle-shaped printed antenna for broadband CP radiation.
• To investigate the antenna's performance for potential wireless communication applications.

Main Methods:

• A sickle-shaped radiator and a slotted ground plane were employed to achieve wideband CP characteristics.
• Antenna dimensions were optimized for specific frequency bands.
• Simulations and measurements were conducted to validate the design.

Main Results:

• The antenna achieved a 10 dB impedance bandwidth of 7.70 GHz (126.85%) from 2.22 to 9.92 GHz.
• A 3 dB axial ratio (AR) bandwidth of 2.64 GHz (73.33%) was obtained from 2.28 to 4.92 GHz.
• Measured results showed excellent agreement with simulations, confirming robust CP properties.

Conclusions:

• The proposed antenna offers a simple structure with broad impedance and AR bandwidth, making it suitable for various wireless communication systems.
• Its easy printed structure and scalable dimensions with broadband CP characteristics position it as a strong candidate for numerous CP wireless applications.