A Novel High-Isolation Dual-Polarized Patch Antenna with Two In-Band Transmission Zeros

Area of Science:

• Electrical Engineering
• Electromagnetics
• Antenna Theory

Background:

• Dual-polarized antennas are crucial for modern wireless communication systems, but achieving high port isolation remains a challenge.
• Existing decoupling techniques often compromise antenna bandwidth or efficiency.

Purpose of the Study:

• To propose a novel dual-polarized patch antenna design with high port isolation and dual in-band transmission zeros (TZs).
• To enhance the decoupling bandwidth and overall performance of the antenna through innovative circuit elements.

Main Methods:

• Design and analysis of a suspended metal patch antenna incorporating an internal neutralization line (I-NL) and a T-shaped decoupling network (T-DN).
• Development of an equivalent circuit model to explain the decoupling principles of the I-NL.
• Derivation of design formulas for the feeding structure.
• Simulation and experimental validation of the proposed antenna.

Main Results:

• The proposed antenna achieves two in-band transmission zeros (TZs), significantly improving port isolation.
• Demonstrated wide operating bandwidth from 2.5 to 2.7 GHz.
• Achieved high port isolation exceeding 30 dB and excellent efficiency above 85%.

Conclusions:

• The novel dual-polarized patch antenna design effectively suppresses mutual coupling through dual TZs.
• The integrated I-NL and T-DN provide a robust solution for high-isolation antenna applications.
• The design offers a promising approach for advanced wireless communication systems requiring superior antenna performance.