Transition-induced phase modification for scanning rate enhancement in a fast-wave V-band SIW leaky-wave antenna
- 1The University of Texas at Dallas
Abstract
A V-band substrate-integrated waveguide (SIW) leaky-wave antenna with enhanced frequency-scanning capability is presented. The antenna consists of a uniform fast-wave SIW radiating section excited through a grounded coplanar waveguide (GCPW)-to-SIW transition incorporating an etched magnetic-dipole (M-dipole) horn. Frequency-dependent beam scanning arises from the dispersive phase constant of the dominant TE 10 mode in the SIW radiating section, while the GCPW transition couples quasi-TEM feed excitation into the TE 10 SIW aperture mode. The etched M-dipole horn introduces a localized boundary perturbation at the excitation interface, producing a frequency-dependent change in the extracted effective phase constant and increasing the dispersion slope. As a result, the measured scanning range expands from 22 ∘ for the standalone LWA to 40 ∘ over 58.6–62.5 GHz, corresponding to a scanning rate of 621.11 ∘ per unit fractional bandwidth. The fabricated prototype achieves 12.9 dBi peak realized gain and radiation efficiency exceeding 85%. The proposed transition-assisted scanning approach is suited for compact mmWave radar sensing, V2X short-range communication, UAV links, and beam-steerable front ends where periodic loading or multilayer slow-wave structures increase design complexity.
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BibTeX
@article{sah2026transitioninduced,
title = {{Transition-induced phase modification for scanning rate enhancement in a fast-wave V-band SIW leaky-wave antenna}},
author = {Pallav Kumar Sah and Ifana Mahbub},
journal = {Scientific Reports},
year = {2026},
month = jul,
doi = {10.1038/s41598-026-60365-5},
url = {https://doi.org/10.1038/s41598-026-60365-5},
note = {CC BY},
}
RIS
TY - JOUR
TI - Transition-induced phase modification for scanning rate enhancement in a fast-wave V-band SIW leaky-wave antenna
AU - Pallav Kumar Sah
AU - Ifana Mahbub
PY - 2026
DA - 2026/07/01
JO - Scientific Reports
DO - 10.1038/s41598-026-60365-5
UR - https://doi.org/10.1038/s41598-026-60365-5
AB - A V-band substrate-integrated waveguide (SIW) leaky-wave antenna with enhanced frequency-scanning capability is presented. The antenna consists of a uniform fast-wave SIW radiating section excited through a grounded coplanar waveguide (GCPW)-to-SIW transition incorporating an etched magnetic-dipole (M-dipole) horn. Frequency-dependent beam scanning arises from the dispersive phase constant of the dominant TE _10 mode in the SIW radiating section, while the GCPW transition couples quasi-TEM feed excitation into the TE _10 SIW aperture mode. The etched M-dipole horn introduces a localized boundary perturbation at the excitation interface, producing a frequency-dependent change in the extracted effective phase constant and increasing the dispersion slope. As a result, the measured scanning range expands from 22 ^∘ for the standalone LWA to 40 ^∘ over 58.6–62.5 GHz, corresponding to a scanning rate of 621.11 ^∘ per unit fractional bandwidth. The fabricated prototype achieves 12.9 dBi peak realized gain and radiation efficiency exceeding 85%. The proposed transition-assisted scanning approach is suited for compact mmWave radar sensing, V2X short-range communication, UAV links, and beam-steerable front ends where periodic loading or multilayer slow-wave structures increase design complexity.
SN - 2045-2322
ER -