ArticleScientific reports2026
An ultra-wideband Vivaldi antenna development for brain microwave imaging.
Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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4 authors.
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Abstract
This article presents a comprehensive analysis of a tiny, rectangular, and exponentially tapered slotted ultra-wideband (UWB) Vivaldi antenna developed explicitly for brain microwave imaging. The antenna comprises seven symmetric rectangular slots carved on both sides of the rear radiative wings of a tapered slot antenna. The antenna's total dimensions, which encompass the ground layer, are 0.39λ × 0.33λ × 0.007λ while operating at a lower frequency of 1.35 GHz. The simulated impedance bandwidth (IBW) is observed to have a range of frequencies between 1.35 and 5.50 GHz, with a fractional bandwidth (FBW) of 121.17%, where the magnitude of |S11|< - 10 dB. On the other hand, the measured IBW spans from 1.4 to 6.4 GHz, exhibiting an FBW of 128.20%. The antenna has a gain of 9.99 decibels isotropic (dBi) and possesses directional radiation properties, along with a front-to-back ratio (FBR) exceeding 30 dB. The analysis conducted in the time domain demonstrates little pulse distortion and a group delay of less than one nanosecond, indicating good performance. Additionally, the system exhibits a high-fidelity factor of 96.26% and maintains linearity in the transmission phase (S
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