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Fast Transmitarray Synthesis with Far-Field and Near-Field Constraints.
Susana Loredo1, Enrique G Plaza2, Germán León1
1Group of Signal Theory and Communications, Department of Electrical Engineering, University of Oviedo, 33204 Gijón, Spain.
Sensors (Basel, Switzerland)
|June 24, 2022
Summary
This study introduces an efficient technique for designing planar transmitarray antennas for millimeter-wave communications. The method synthesizes antennas meeting both near-field and far-field radiation pattern requirements.
Area of Science:
- Electromagnetics and Antenna Theory
- Wireless Communications
Background:
- Millimeter-wave (mmWave) communication systems offer high-data-rate potential.
- Indoor small cell deployments require antennas with specific radiation patterns.
Purpose of the Study:
- To propose a novel synthesis technique for planar transmitarray antennas.
- To address simultaneous near-field and far-field radiation pattern requirements.
Main Methods:
- An iterative synthesis process involving near-field computation and Fast Fourier Transforms (FFTs).
- Near-field computation is performed by summing far-field contributions from array elements.
- The method utilizes inverse and direct FFTs for efficient field generation.
Main Results:
- Demonstrated the technique's efficiency in terms of computation time.
- Successfully synthesized antennas with a near-field null and a focal point, both directed to a specific far-field direction.
- Validated results through the fabrication and measurement of two 26 GHz quasi-planar prototypes.
Conclusions:
- The proposed technique is effective for designing transmitarray antennas with dual near-field and far-field specifications.
- Experimental validation confirms the algorithm's accuracy.
- The method shows potential for extension to more complex antenna designs and scenarios.
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