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H-Band quartz-silicon leaky-wave lens with air-bridge interconnect to GaAs front-end

: Campo, Marta Arias; Holc, Katarzyna; Weber, Rainer; Martino, Carmine de; Spirito, Marco; Leuther, Arnulf; Bruni, Simona; Llombart, Nuria


IEEE Transactions on Terahertz Science and Technology 11 (2021), Nr.3, S.297-309
ISSN: 2156-342X
Fraunhofer IAF ()
mm-wave; H-band; lens antenna; leaky-wave antenna; air-bridge chip interconnect; off-chip antenna; Antenna-in-Package

Thanks to the large bandwidth availability, millimeter and sub-millimeter wave systems are getting more attractive to be used in a wide range of applications, such as high-resolution radar or high-speed communications. In this contribution, a new lens antenna in-package solution is presented for the H-band (220-320 GHz), including a wideband quartz-cavity leaky-wave feed combined with an air-bridge chip interconnect technology, based on spray coating and laser lithography. This interconnection acts as a wideband, low-loss transition between the GaAs front-end and the quartz antenna, avoiding the use of expensive waveguide split-blocks. An antenna prototype including the interconnect has been manufactured and characterized, validating the full-wave simulated results for the integrated H-band leaky-wave with aperture efficiency higher than 74% over 34% bandwidth, and radiation efficiency higher than 70% over 37%of bandwidth.