%0 Journal Article %T Broadband Passive Two-Feed-Per-Beam Pillbox Architecture for High Beam Crossover Level %+ Institut d'Électronique et des Technologies du numéRique (IETR) %+ Optiprint AG %A Potelon, Thomas %A Ettorre, Mauro %A Bateman, Terry %A Francey, Jim %A Sauleau, Ronan %Z European Union Seventh Framework Programme (FP7/2007-2013) through the MiWaveS Project [619563] %Z European Union through the European Regional Development Fund (ERDF)European Union (EU) %Z Ministry of Higher Education and Research, Brittany and Rennes Metropole, through the Contrat de plan Etat-Region (CPER) Project SOPHIE/STIC and Ondes %< avec comité de lecture %@ 0018-926X %J IEEE Transactions on Antennas and Propagation %I Institute of Electrical and Electronics Engineers %V 68 %N 1 %P 575-580 %8 2020-01 %D 2020 %R 10.1109/TAP.2019.2934353 %K Crossover level %K multi-beam antennas %K multiple-feed-per-beam %K pillbox %K substrate integrated waveguide (SIW) technology %Z Engineering Sciences [physics]/Signal and Image processingJournal articles %X 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 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. %G English %2 https://univ-rennes.hal.science/hal-02469489/document %2 https://univ-rennes.hal.science/hal-02469489/file/Potelon%20et%20al-2019-Broad-Band%20Passive%20Two-Feeds-Per-Beam%20Pillbox%20Architecture%20for%20High%20Beam.pdf %L hal-02469489 %U https://univ-rennes.hal.science/hal-02469489 %~ UNIV-NANTES %~ UNIV-RENNES1 %~ CNRS %~ INSA-RENNES %~ IETR %~ STATS-UR1 %~ CENTRALESUPELEC %~ UR1-HAL %~ UR1-MATH-STIC %~ UR1-UFR-ISTIC %~ IETR-BEAMS %~ IETR-ADH %~ TEST-UR-CSS %~ UNIV-RENNES %~ INSA-GROUPE %~ TEST-HALCNRS %~ UR1-MATH-NUM %~ IETR-SUMIT %~ NANTES-UNIVERSITE %~ UNIV-NANTES-AV2022