Cadence released their Allegro16.5 version which provides direct links to Agilent ADS for RF PCB designs allowing designers to transfer schematics or layouts between these 2 tools. Click on this link to get more info.
The Cadence® Allegro® PCB RF Option is a mixed-signal design environment, from schematic to layout with back annotation, proven to increase RF design productivity up to 50%. It allows engineers to create, integrate, and update RF/microwave circuits with digital/analog circuits in the Allegro PCB Design environment. With its rich layout capability and powerful interfaces with RF simulation tools, it allows engineers to start RF design from Allegro Design Entry-HDL, Allegro PCB Editor, or Agilent ADS.