Broadband Passive Two-Feed-Per-Beam Pillbox Architecture for High Beam Crossover Level

Multi-beam antennas based on quasi-optical systems feeding a single radiating aperture generate orthogonal beams with a low crossover level between adjacent beams (around -13 dB at most). To circumvent this limitation, we present a circuit architecture allowing the excitation of a quasi-optical syst...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2020-01, Vol.68 (1), p.575-580
Main Authors: Potelon, Thomas, Ettorre, Mauro, Bateman, Terry, Francey, Jim, Sauleau, Ronan
Format: Article
Language:English
Subjects:
Antenna measurements
Antenna radiation patterns
Apertures
Architecture
Beams (radiation)
Broadband
Circuit design
Couplers
Crossover level
Crossovers
Engineering Sciences
Feeds
Frequencies
Level (quantity)
multi-beam antennas
Multibeam antennas
multiple-feed-per-beam
pillbox
Radar antennas
Signal and Image processing
substrate integrated waveguide (SIW) technology
Substrate integrated waveguides
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Description
Summary:Multi-beam antennas based on quasi-optical systems feeding a single radiating aperture generate orthogonal beams with a low crossover level between adjacent beams (around -13 dB at most). To circumvent this limitation, we present a circuit architecture allowing the excitation of a quasi-optical system (pillbox system) with two feeds per beam to reach much higher beam crossover levels. To this end, a specific eight-beam passive circuit is designed to cover the 76-86 GHz frequency band. It is based on a single-layer substrate integrated waveguide (SIW) coupler followed by equiphase SIW lines. The maximum phase and amplitude imbalance between the sources are only 35 (λ g /1g, with λ g the wavelength in the SIW lines at the design frequency) and 1.3 dB, respectively, and the isolation is better than -19 dB. The measured beam crossover level of the corresponding antenna is better than -3.2 dB, corresponding to an improvement of 16 dB with respect to single-feed-per-beam pillbox systems. The proposed passive architecture offers beam crossover levels suitable for low-cost electronically controlled multi-beam applications, as for next-generation 5G backhauling systems.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2019.2934353