Abstract
Toward the realization of ultra-fast wireless communications systems, the inherent broad bandwidth of the terahertz (THz) band is attracting attention, especially for short-range instant download applications. In this paper, we present our recent progress on InP-based THz MMICs and packaging techniques based on low-temperature co-fibered ceramic (LTCC) technology. The transmitter MMICs are based on 80-nm InP-based high electron mobility transistors (HEMTs). Using the transmitter packaged in an E-plane split-block waveguide and compact lens receiver packaged in LTCC multilayered substrates, we tested wireless data transmission up to 27 Gbps with the simple amplitude key shifting (ASK) modulation scheme. We also present several THz antenna-in-packaging solutions based on substrate integrated waveguide (SIW) technology. A vertical hollow (VH) SIW was applied to a compact medium-gain SIW antenna and low-loss interconnection integrated in LTCC multi-layer substrates. The size of the LTCC antennas with 15-dBi gain is less than 0.1 cm3. For feeding the antenna, we investigated an LTCC-integrated transition and polyimide transition to LTCC VH SIWs. These transitions exhibit around 1-dB estimated loss at 300 GHz and more than 35 GHz bandwidth with 10-dB return loss. The proposed package solutions make antennas and interconnections easy to integrate in a compact LTCC package with an MMIC chip for practical applications.
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Acknowledgments
This work was supported in part by the research and development program “Multi-tens gigabit wireless communication technology at sub-terahertz frequencies” of the Ministry of Internal Affairs and Communications, Japan.
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Tajima, T., Kosugi, T., Song, HJ. et al. Terahertz MMICs and Antenna-in-Package Technology at 300 GHz for KIOSK Download System. J Infrared Milli Terahz Waves 37, 1213–1224 (2016). https://doi.org/10.1007/s10762-016-0313-6
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DOI: https://doi.org/10.1007/s10762-016-0313-6