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A SIW cavity-backed symmetrical dual-beam self-diplexing slot antenna for mm-wave applications

Published online by Cambridge University Press:  13 June 2025

Prativa Swain Open the ORCID record for Prativa Swain [Opens in a new window]  and
Sushrut Das
Prativa Swain*
Affiliation:
Department of Electronics Engineering, Indian Institute of Technology (Indian School of Mines) Dhanbad, Dhanbad, India
Sushrut Das
Affiliation:
Department of Electronics Engineering, Indian Institute of Technology (Indian School of Mines) Dhanbad, Dhanbad, India
*
Corresponding author: Prativa Swain; Email: prativa.vssut@gmail.com
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Abstract

This paper presents an Substrate Integrated Waveguide (SIW) cavity-backed symmetric dual-beam self-diplexing slot antenna for short-distance multiuser point-to-point communications using mm-wave frequency bands. The antenna is fed by two capacitive-gap-coupled microstrip lines, which help the antenna to operate at two different frequency bands with a self-diplexing property. Independent frequency tunability at both the operating bands can be achieved by varying the capacitive gap position along the microstrip feed lines. To enhance port isolation and achieve dual-beam characteristics the design incorporates an L-shape folded slots, centrally located shorting via, W-slot, corrugated microstrip structures and mender line slot. The beams are directed at ± $\theta = \pm 43^\circ$ with a half-power beam width of 56∘ each. The antenna offers peak realized gains of 5.95 and 6.21 dBi at the lower and upper band, respectively. The antenna is fabricated and measured, which shows a good agreement between simulation and measurement, confirming its suitability for short-distance multiuser point-to-point communications

Keywords

CGCR BPFdual-beammender line slotmm-wave frequencyself-diplexingSIWW-slot
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , First View , pp. 1 - 9
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Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with The European Microwave Association.

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