A full Ka band gap waveguide based slot array antenna with 45° slant polarization

This work focuses on the development of a very wideband, 45° slant-polarized, 8 × 8-element slot antenna array for Ka-band applications. The proposed antenna utilizes gap waveguide to suppress undesired electromagnetic energy leakage and ensure high gain and efficiency. In the proposed design, the r...

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Bibliographic Details
Published in:Scientific reports Vol. 15; no. 1; pp. 26805 - 13
Main Authors: Zarifi, Davood, Farahbakhsh, Ali, Mrozowski, Michal
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 23.07.2025
Nature Publishing Group
Nature Portfolio
Subjects:
639/166/987
639/766/25
Antennas
Arrays
Bandwidths
Design
Efficiency
Humanities and Social Sciences
multidisciplinary
Polarization
Radiation
Science
Science (multidisciplinary)
XPD protein
ISSN:2045-2322, 2045-2322
Online Access:Get full text
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Summary:This work focuses on the development of a very wideband, 45° slant-polarized, 8 × 8-element slot antenna array for Ka-band applications. The proposed antenna utilizes gap waveguide to suppress undesired electromagnetic energy leakage and ensure high gain and efficiency. In the proposed design, the radiating slots are rotated by 45°, and a novel two-layer feed network implemented on the compact folded E-plane groove gap waveguide power dividers is used to excite the slots. An 8 × 8-element array prototype is designed, fabricated, and tested. Experimental results indicate that the proposed antenna array achieves a reflection coefficient better than − 10 dB and a peak gain of 26.9 dB across the full Ka-band bandwidth of 26.35 to 40 GHz. Due to the low-loss characteristics of gap waveguide technology, the antenna array exhibits high gain and efficiency. Additionally, the measured sidelobe level (SLL) and cross-polarization discrimination (XPD) are better than − 24.1 dB and 25.6 dB, respectively. The main advantages provided by the proposed E-plane groove gap waveguide-base antenna array with 45° Slant Polarization are low-profile, low-loss, wide bandwidth and usability at mm Wave frequencies.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-025-12793-y