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High Efficiency Dual-Band Dual-Circularly Polarized Transmitarray Antenna.
Tianling Zhang1, Boxiang Yang2, Jiayin Guo3
1School of Electronic Engineering, Xidian University, Xi'an 710071, China.
Micromachines
|March 27, 2025
Summary
This study presents a dual-band transmitarray antenna for 5G millimeter-wave applications. The proposed antenna achieves high gain and efficiency across the 28/39 GHz bands.
Area of Science:
- Electrical Engineering
- Antenna Theory
- Millimeter-Wave Technology
Background:
- Fifth-generation (5G) wireless communication systems require high-performance antennas for millimeter-wave (mmWave) frequencies.
- Dual-band operation is crucial for flexibility and capacity in mmWave applications.
- Transmitarray antennas offer a planar and scalable solution for beamforming and high-gain applications.
Purpose of the Study:
- To propose and demonstrate a novel dual-band, dual-circularly polarized transmitarray antenna (TA).
- To achieve efficient operation at the 28 GHz and 39 GHz frequency bands for 5G mmWave systems.
- To validate the design through simulation and experimental measurement.
Main Methods:
- Design of a transmitarray unit cell comprising a broadband linearly polarized (LP) receiving part and a dual-band dual-circularly polarized transmitting part.
- Implementation of over-2-bit phase compensation using U-shaped slot dimensions and receiving part rotation.
- Fabrication and measurement of a 24x24 TA array with an aperture size of 88.8 mm x 88.8 mm, fed by a wide-band corrugated horn antenna.
Main Results:
- Simulated maximum gains of 26.28 dBic (26.5-29.5 GHz) and 27.4 dBic (37-40 GHz).
- Measured maximum efficiencies of 53.56% (low band) and 42.89% (high band).
- Demonstrated dual-band (28/39 GHz) operation suitable for 5G mmWave.
Conclusions:
- The proposed transmitarray antenna effectively covers the 28/39 GHz bands for 5G mmWave applications.
- The design offers advantages such as low cost, high gain, and high efficiency.
- The experimental validation confirms the simulation accuracy and the antenna's practical viability.
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