A new multichip monolithic microwave integrated circuit (MMIC) package operable to X and Ka bands has been developed and tested. This package provides space for mounting up to five MMIC chips and has three radio frequency (RF) and five dc feed-throughs. The RF feed-throughs are of a mixed-mode, conductor-backed coplanar waveguide design that minimizes reflections and insertion loss over a wide bandwidth. The dc feed-throughs permit bias access for up to five chips and internal mounting of chip bypass capacitors. Prototypes of the package have been built and tested using miniature coplanar probes. Test results indicate that the RF feed-throughs meet design goals to about 30 GHz and can be used to about 35 GHz. The package has been analyzed using a "Composite Model" approach in which individual elements are separately analyzed and modeled and then combined in a circuit simulator to provide a complete package model. This approach has provided quite good agreement with measured data.Index Terms-Computer modeling, IC packaging, microwave measurements, monolithic microwave integrated circuit (MMIC).
We have developed a rugged, inexpensive two-port package for mounting a cascade of monolithic microwave ICs. The package consists of two layers of alumina on which are deposited silkscreened metal pastes to form the metal patterns. This paper describes the rf design of the conductors and presents the measured transmission properties of the package. The suppression of parallel-plate waveguide resonances by the introduction of via walls along the transmission lines is also described.
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