SILICON MONOLITHIC MM-WAVE INTEGRATED-CIRCUIT (SIMMWIC) DEVICES MOUNTED UP-SIDE-DOWN ON A COPPER HEAT SINK INTEGRAL WITH CAVITY RESONATOR

Silicon monolithic mm-wave integrated circuits (SIMMWIC) used as oscil lators in radar system applications in the 60-80 GHz regime are mounte d on a heat sink with integrated resonator. The heat sink consists of a thin carrier plate (aluminum nitride (AlN) or copper (Cu) and and a gold plated copper block with integrated resonator cavity. The resonat or cavity is formed by a rectangular cavity milled in the Cu block, te rminated on the top by the gold plated carrier plate on top of which a mm-wave emitting integrated coplanar slot transmitter is mounted up-s ide-down. The main part of the emitted RF power is radiated through th e substrate-perpendicular to the chip plane-the other part is coupled through a slit on the carrier plate into the resonator cavity leading to a higher spectral purity and a stabilization of the oscillating fre quency.