A Wide-Beam Antenna Array with Spatially-Variable-Orthogonal-Polarizations (SVOP) Achieved by Polarization-Mixing

This paper introduces a novel polarization-mixing strategy to significantly widen the beamwidth of dual-linear-polarized antenna arrays without changing the array topology. Instead of using the two polarizations separately as usual, it blends the orthogonal linearly-polarized radiations to achieve w...

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Vydáno v:IEEE transactions on antennas and propagation Ročník 71; číslo 9; s. 1
Hlavní autoři: Zeng, Fan Chao, Ding, Can, Chen, Yue-Nian, Jay Guo, Y.
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.09.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Amplitudes
Antenna arrays
Antennas
Arrays
Base station antenna array
beamwidth control
Cellular communication
Communications systems
cross-dipole
Dual polarization (waves)
dual polarizations
Orthogonality
Phase shifters
Polarization
polarization diversity
polarization orthogonality (PO)
polarization-mixing
spatially-variable-orthogonal-polarization (SVOP)
Topology
wide beamwidth
ISSN:0018-926X, 1558-2221
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Popis
Shrnutí:This paper introduces a novel polarization-mixing strategy to significantly widen the beamwidth of dual-linear-polarized antenna arrays without changing the array topology. Instead of using the two polarizations separately as usual, it blends the orthogonal linearly-polarized radiations to achieve wider beamwidth. The proposed method is implemented on a typical ±45°-polarized base station antenna array with its thought process and working mechanism elaborated. Much wider beamwidth is achieved compared to the traditional pattern synthesis methods based on amplitude and phase weighting or sparse arrays. The beamwidth can be controlled by simply tuning one phase shifter. Importantly, this method allows all the elements to be fully excited with the same amplitude, thus avoiding using additional amplifiers or attenuators. In the meantime, the polarization-mixing method leads to spatially-variable polarizations (SVP). To obtain polarization diversity required in cellular communication systems, two SVP arrays with the same pattern shapes are designed to have their polarizations orthogonal to each other in all directions of interest. The conditions of achieving orthogonal patterns using this method are theoretically derived and thoroughly validated in theory and in simulation. It is shown that the obtained spatially-variable-orthogonal-polarization (SVOP) arrays have a much broader beam pattern and better polarization orthogonality (PO) than that of the dual-polarized antenna element.
Bibliografie:ObjectType-Article-1
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ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2023.3284015