Demonstration of +100-GHz Interconnects in eWLB Packaging Technology

This paper presents waveguide interconnects implemented in an embedded wafer level ball grid array (eWLB) packaging technology. The interconnects operate at D-band (110-170 GHz), hence are enabling the realization and commercialization of high-data-rate systems. The interconnects rely on implementing radiating structures on the technology's redistribution layers instead of using conventional ball grid arrays for the transmission of the RF signal to/from the package. The interconnects interface with standard WR-6.5 waveguides. Moreover, they do not require any galvanic contacts with the waveguide. The interconnects achieve a measured insertion loss of 2.8 dB over a bandwidth of 33%. The adopted eWLB packaging technology is suitable for low-cost high-volume production and allows heterogeneous integration with other technologies. This paper proposes cost-effective high-performance interconnects for THz integration, thus addressing one of the main challenges facing systems operating beyond 100 GHz.