Simulation-Based Design of a Low-Cost Broadband Wide-Beamwidth Crossed-Dipole Antenna for Multi-Global Navigational...

Area of Science:

• Electrical Engineering
• Antenna Theory
• Satellite Communications

Background:

• Global Navigation Satellite Systems (GNSS) require robust antennas for reliable positioning.
• Existing antennas may have limitations in bandwidth, polarization, or gain for multi-GNSS applications.
• Circular polarization is crucial for mitigating signal fading and multipath effects in satellite communication.

Purpose of the Study:

• To design and analyze a wideband circularly polarized crossed-dipole antenna.
• To achieve broadband operation and wide beamwidth for gain and axial ratio.
• To validate the antenna's performance for multi-GNSS and L-band satellite phone communication.

Main Methods:

• Utilized CST Studio Suite for electromagnetic simulation and antenna design.
• Implemented orthogonally placed dipole elements fed by a three-branch quadrature hybrid coupler.
• Simulated performance metrics including reflection coefficient, gain, and axial ratio across specified frequency bands.

Main Results:

• Achieved a reflection coefficient below -17 dB from 1.16-1.61 GHz.
• Obtained zenith gain ranging from 3.9-5.8 dBic and horizontal gain from -3.3 to -0.2 dBic.
• Demonstrated excellent axial ratio performance (0.6-1.0 dB zenith, 0.4-5.9 dB horizontal) and potential for L-band satellite phone communication.

Conclusions:

• The designed crossed-dipole antenna meets the requirements for multi-GNSS applications.
• The antenna exhibits favorable wideband, circularly polarized characteristics.
• The proposed design is suitable for both multi-GNSS and L-band satellite phone communication.