A Compact Dual-Band Single-Feed Slotted Waveguide Array Antenna for Unidirectional Radiation Patterns

A dual-band slotted waveguide array (SWA) antenna is designed using a single waveguide by placing the radiating slots for 18 and 24 GHz on the same antenna aperture. These bands are excited using a single excitation point through a conventional waveguide feeding technique to radiate unidirectional r...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2024-01, Vol.72 (12), p.9095-9102
Main Authors: Roy, Aritra, Allanic, Rozenn, Le Gouguec, Thierry, Gallee, Francois, Fourn, Erwan, Amiaud, Anne-Charlotte, Legay, Herve
Format: Article
Language:English
Subjects:
Antenna
Antenna arrays
Antenna measurements
Antenna radiation patterns
Antennas
Aperture antennas
Band theory
Boresights
Dual band
Engineering Sciences
Impedance
Impedance matching
Integrated circuit modeling
Laser sintering
Linear polarization
Lithography
Mutual coupling
Numerical models
Polarized radiation
Radiation
Resonant frequency
Slot antennas
slot array
waveguide
Waveguides
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Summary:A dual-band slotted waveguide array (SWA) antenna is designed using a single waveguide by placing the radiating slots for 18 and 24 GHz on the same antenna aperture. These bands are excited using a single excitation point through a conventional waveguide feeding technique to radiate unidirectional radiation patterns of the same polarization. Theoretical analyses are carried out to study the conductance of the slots to understand their effects on the dual-band performance. Numerical analyses are performed to optimize the antenna by considering mutual coupling. The antenna is fabricated using stereolithography (SLA) and direct metal laser sintering (DMLS) processes to compare its performance in different additive manufacturing techniques. In characterizing the fabricated prototype, an impedance matching of |S_{11}|\lt -10 dB and the boresight antenna gains of 14 and 17.4 dBi are measured in these bands with unidirectional and linearly polarized radiation patterns. A quantitative comparison among dual-band SWA antennas is presented at the end of this article to highlight the uniqueness of the proposed approach over the state-of-the-art solutions.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2024.3484150