Coupling Substrate-Integrated Waveguides to Increase the Gain Bandwidth of Leaky-Wave Antennas

A novel technique to increase the pattern bandwidth of substrate-integrated waveguide leaky-wave antennas (SIW LWAs) is proposed. By coupling several SIWs, it is shown that the gain at the desired angle can be kept stable across a wide-frequency band. A systematic design methodology based on a simpl...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2018-06, Vol.66 (6), p.3099-3109
Main Authors: Poveda-Garcia, Miguel, Canete-Rebenaque, David, Goussetis, George, Gomez-Tornero, Jose Luis
Format: Article
Language:English
Subjects:
Antennas
Bandwidth
Bandwidths
Broadband antennas
Coupling
Couplings
Dispersion
Frequencies
frequency beam squint
Gain
Leaky wave antennas
Leaky waves
leaky-wave antennas (LWAs)
Mathematical model
Power gain
Substrate integrated waveguides
substrate-integrated waveguide (SIW)
Substrates
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Summary:A novel technique to increase the pattern bandwidth of substrate-integrated waveguide leaky-wave antennas (SIW LWAs) is proposed. By coupling several SIWs, it is shown that the gain at the desired angle can be kept stable across a wide-frequency band. A systematic design methodology based on a simple transverse equivalent network is presented. Practical coupled-SIW designs with gain exceeding 10 dB and pointing at 30° in the 15-GHz band are reported to validate the theory. Simulation and experimental results demonstrate an enhancement of the half-power gain bandwidth from 2.5% (380 MHz) in the single-SIW design to 9% (1360 MHz) for an LWA composed of three coupled SIWs.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2018.2830396