The impact of the packaging configuration on cross talk and feed back effects caused by parasitic substrate modes is investigated for coplanar millimeter-wave circuits. It is demonstrated theoretically and by means of several circuit examples that both the mounting configuration and the thickness of the semiconductor substrate of coplanar MMICs have to be chosen appropriately, in order to avoid circuit degradation or even failure

No abstract

No abstract

No abstract

A feasibility study for a high resolution positron emission tomograph, based on 9 . 5~4~4 mm3 LSO crystals viewed by 3 mm diameter avalanche photodiodes, has been carried out. Using a Na2* source we determined a spatial resolution of 2.3 f 0.1 mm, an energy resolution around 15 % and a time resolution of 2.6 nsec. Possible configurations for larger scale tests and a tomograph are given.

No abstract

No abstract

No abstract