Hybrid and monolithic integrated optic/millimeter-wave converters for 60 GHz radio-over-fiber systems
Hybrid as well as monolithic integrated /spl lambda/=1.55 /spl mu/m optic/millimeter-wave converters were developed and investigated experimentally based on detailed microwave simulations. Both converters working near 60 GHz showed responsitivities of about 1 A/W in good agreement with the simulations.
60 GHz GaAs MMIC technology for a high data rate mobile broadband demonstrator
A millimeter-wave front end demonstrator for broadband pico-cell networks has been developed using 60 GHz GaAs MMIC technology. The following sub-assemblies are integrated in the demonstrator: a 56.8 GHz phase locked LO, an upconverter from 5.2-6.2 GHz IF to a 62-63 GHz band, a double-channel low noise downconverter from the 62-63 GHz band to an IF of 5.2-6.2 GHz, and a power amplifier for the 62 GHz to 66 GHz band. For a duplex operation a second upconverter module operating at 65-66 GHz (IF 8.2-9.2 GHz) is used. All monolithic HFET and PHFET circuits are realised using subquarter micron technologies. For the fully assembled receivers overall noise figures of less than 10 dB have been measured. Field tests have proven the ability to transmit data nearly error free over a distance of 200 m.
Investigations of dielectric gratings using electrodynamic models based on volume integral equations
Eigenmodes of planar and cylindrical dielectric gratings (DGs) and electromagnetic wave scattering from multiplayer DGs are investigated. The DG characteristics are calculated using numerical-analytical solution of integral equations (IEs).