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Pascual, Alvaro J.; Ali, Muhsin; Batte, Thomas; Ferrero, Fabien; Brochier, Laurent; de Sagazan, Olivier; van Dijk, Frederic; Munoz, Luis E. Garcia; Barrio, Guillermo Carpintero Del; Sauleau, Ronan; Gonzalez-Ovejero, David
Journal of lightwave technology, 02/2022, Volume: 40, Issue: 3Journal Article
We present a photonically-excited antenna array at E-band for scanning by beam switching in wireless links. First, we discuss the proposed technique applied to photonic-enabled (sub)millimeter-wave transmitters. Next, we present our implementation; it consists of two sub-arrays of stacked patches as primary feeds of a Polytetrafluoroethylene (PTFE) lens, with one photodiode feeding each sub-array. To validate the assembly, the return loss and radiation patterns have been measured for one of the sub-arrays excited with a coplanar probe. In turn, the lens illuminated by one of the sub-arrays yields a directivity of 27 dBi. The radiation patterns measured for the transmitter module (including the lens) are in very good agreement with full-wave simulations, and they show that excitation of one of either sub-arrays allows beam switching between <inline-formula><tex-math notation="LaTeX">\pm 2.7^\circ</tex-math></inline-formula> with a beam crossover at <inline-formula><tex-math notation="LaTeX">-3\, \mathrm{dB}</tex-math></inline-formula>. Finally, we have tested the transmitter in a 0.6 m wireless link. Depending on the position of the detector and on which sub-array is excited, we have accomplished 5 Gbps transmission for on-off-keying modulation and direct detection (BER <inline-formula><tex-math notation="LaTeX">=10^{-11}</tex-math></inline-formula>). The system constitutes an initial proof of photonic-assisted beam switching for mm-wave transmitters enabling broadband operation with a directive and switchable beam.
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