Realization of Deep Tilt Angle, High Aperture Efficiency, and Low Sidelobe Using a Single Metaplate and a Patch Antenna

A beam-forming system for a patch antenna is proposed to realize a deeply tilted beam with high-gain, high aperture efficiency, and low sidelobe level. The proposed system uses only one novel metaplate, where the total system height is less than one wavelength. Firstly, a T-shaped metatwin is create...

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Bibliographic Details
Published in:IEEE access 2022, Vol.10, p.24-33
Main Authors: Nakano, Hisamatsu, Abe, Tomoki, Yamauchi, Junji
Format: Article
Language:English
Subjects:
Antenna feeds
Antenna measurements
Antennas
Aperture antennas
Apertures
Array signal processing
Beam forming
Beamforming
deep tilt angle
Directive antennas
Efficiency
Frequency response
Gain
High gain
metaplate
patch antenna
Patch antennas
Plane waves
Sidelobe reduction
Sidelobes
Spherical waves
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Summary:A beam-forming system for a patch antenna is proposed to realize a deeply tilted beam with high-gain, high aperture efficiency, and low sidelobe level. The proposed system uses only one novel metaplate, where the total system height is less than one wavelength. Firstly, a T-shaped metatwin is created as an element for the metaplate. It is revealed that the metatwin can provide a phase shift of more than 450° with change in the metatwin arm length. Based on this, secondly, a simulation is performed where a normally incident plane wave is refracted at a deep angle of 65° using a single metaplate. Thirdly, the incident plane wave is changed to a quasi-spherical wave using a small patch antenna. It is found that a 65° tilted beam is formed by virtue of a newly designed single metaplate. It is also found that a gain of 18.1 dBi is realized with an aperture efficiency of 49% and a maximum side lobe level of −14.6 dB. Fourthly, all simulated results, including the frequency response of the gain and S11, are validated using measured results.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2021.3137890