A low-profile high-isolation dual-polarized base station antenna based on AMC

Area of Science:

• Electromagnetics
• Antenna Engineering
• Wireless Communications

Background:

• Base station deployment costs and antenna resource limitations necessitate innovative antenna solutions.
• Traditional base station antennas often have bulky profiles, increasing deployment challenges.

Purpose of the Study:

• To develop a low-profile base station antenna for Sub-6 GHz applications.
• To reduce deployment costs and address antenna resource shortages through antenna design innovation.

Main Methods:

• Designed a square cross-dipole antenna with chamfered corners for enhanced impedance matching and port isolation.
• Integrated an Artificial Magnetic Conductor (AMC) surface to replace the conventional metal floor.
• Utilized AMC properties to suppress surface waves and provide phase compensation, reducing antenna profile height.

Main Results:

• Achieved a low antenna profile height of 0.11λ.
• Obtained an impedance bandwidth of 3.1-4.1 GHz.
• Demonstrated port isolation greater than 42 dB and a Voltage Standing Wave Ratio (VSWR) less than 1.5.
• Measured a gain greater than 8.5 dBi with stable radiation patterns across the operating band.

Conclusions:

• The developed low-profile base station antenna effectively meets performance requirements for Sub-6 GHz applications.
• The integration of AMC technology offers a viable solution for reducing antenna size and improving isolation.
• This design contributes to more cost-effective and efficient base station deployments.