International Journal For Multidisciplinary Research

E-ISSN: 2582-2160   •   Impact Factor: 9.24

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Design and Analysis of a Dual-Band Vivaldi Antenna for Wideband Wireless Applications

Author(s) Brahman Singh Bhalavi, Anurag Shrivastava, Ram Dulare Nirala
Country India
Abstract This paper presents the design and numerical analysis of a compact dualband Vivaldi antenna operating in the C-band region. The antenna is realized on an FR-4 substrate (relative permittivity εr ≈ 4.4) to ensure low-cost fabrication and practical implementation. Dual-band behavior is achieved by introducing a modified exponentially tapered slot combined with a circular slot perturbation near the feed region, enabling controlled excitation of multiple resonant modes. Full-wave electromagnetic simulations demonstrate two distinct resonances at 4.55 GHz and 5.79 GHz, with excellent impedance matching levels of −63 dB and −45 dB, respectively. The proposed structure maintains stable radiation characteristics with end-fire behavior across both operating bands. Surface current analysis confirms that the lower resonance is dominated by the slot-loaded feed region, while the upper resonance is governed by the tapered aperture profile. The compact size, strong impedance matching, and simple geometry make the antenna suitable for C-band wireless communication, radar sensing, and multi-band RF applications.
Keywords Vivaldi Antenna, Dual-band Antenna, Tapered Slot Antenna (TSA), FR-4 Substrate, C-band Antenna, End-fire Radiation, Slot-loaded Antenna, S-parameters
Published In Conference / Special Issue (Volume 8 | Issue 1) - National Conference on Sciences, Pharmacy, Humanities & Commerce, Engineering for Research and Education (SPHERE-2025) (February 2026)
Published On 2026-02-01
DOI https://doi.org/10.36948/ijfmr.2026.SPHERE-2025.1515
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E-ISSN 2582-2160
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