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Bandwidth enhancement of a planar SIW cavity-backed slot antenna using slot and metallic-shorting via

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Abstract

A bandwidth enhancement method has been described in this paper by using the various cavity modes. The cavity is achieved by a wisely developed substrate integrated waveguide (SIW) technology, which realizes a non-planar cavity-backed antenna in planar form. The whole antenna circuit and feed are integrated on the same plane. Rather than using a conventional slot, a dual T-shaped slot is preferred as a radiating element. The combination of dual T-shaped slot and a shorting via enhances the bandwidth. The slot yields three resonances due to TE110 mode and modified TE120/TE130 modes. The placement of shorting via modifies TE110 mode, which gets coupled with the other higher-order modes and enhances the bandwidth by 50%. The footprint of the square SIW cavity of antenna is 0.86λg × 0.86λg mm2. The proposed geometry is prototyped and experimentally tested. The antenna covers a bandwidth of 400 MHz (6.75–7.15 GHz) with gain of 5.5–6.1 dBi. The antenna shows a front-to-back ratio better than 15 dB with a unidirectional radiation pattern and the cross-polar level below − 15 dB. The antenna is fabricated on a thin substrate of profile 0.052λg on a single layer. In addition, the proposed structure possesses the advantages of low profile, planar, compact size with flat gain and uniform radiation features.

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, SRM University, Amravati, AP, India

    Divya Chaturvedi

  2. Department of Electrical Engineering, College of Engineering, Jouf University, Sakaka, 72388, Aljouf, Saudi Arabia

    Ayman A. Althuwayb

  3. School of Electronics Engineering, Vellore Institute of Technology, Vellore, India

    Arvind Kumar

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  1. Divya Chaturvedi
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  2. Ayman A. Althuwayb
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  3. Arvind Kumar
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Correspondence to Ayman A. Althuwayb.

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Chaturvedi, D., Althuwayb, A.A. & Kumar, A. Bandwidth enhancement of a planar SIW cavity-backed slot antenna using slot and metallic-shorting via. Appl. Phys. A 128, 193 (2022). https://doi.org/10.1007/s00339-022-05309-2

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