Dual-Polarized Dipole Antenna with Wideband Stable Radiation Patterns Using Artificial Magnetic Conductor Reflector

Area of Science:

• Electromagnetics and Antenna Engineering
• Metamaterials and Metasurfaces
• Wireless Communication Systems

Background:

• Traditional 4G dipole antennas struggle with impedance matching and stable radiation patterns in the 5G sub-6 GHz band (3.3-3.8 GHz) due to fixed antenna heights.
• The transition to 5G necessitates antenna solutions that cover broader frequency ranges while maintaining performance.

Purpose of the Study:

• To develop a wideband dual-polarized dipole antenna structure capable of operating effectively across both 4G and 5G sub-6 GHz frequency bands.
• To enhance antenna performance, specifically impedance matching and radiation pattern stability, over a wide operational bandwidth.

Main Methods:

• A connected-ring-shaped metasurface was designed and implemented to function as an artificial magnetic conductor (AMC).
• The AMC structure was integrated with a dual-polarized dipole antenna to improve its wideband characteristics.
• The proposed antenna was fabricated and experimentally validated.

Main Results:

• The developed antenna achieved a wide impedance bandwidth of 80.7%, covering the frequency range of 1.7-4.0 GHz.
• Stable antenna radiation patterns were observed across the entire 1.7-3.8 GHz band.
• An average in-band realized gain of 7.0±1.0 dBi and a stable half power beam width (HPBW) of 70±5 degrees were measured within the 4G/5G bands.

Conclusions:

• The proposed artificial magnetic conductor (AMC) effectively enables a wideband dual-polarized dipole antenna with stable performance across 4G and 5G sub-6 GHz bands.
• This antenna design offers a viable solution for next-generation wireless communication systems requiring broad frequency coverage and reliable radiation characteristics.