I have some experience with RF shielding on SMT boards.  Primarily 
          chem etched folded shields made of tin plated brass, copper or 
          beryllium copper.  The shields were installed onto the surface 
          mount board after pick & place but prior to hot air reflow 
          soldering.  Tabs at the bottom of the shield were used to locate it 
          into plated thru holes in the board.  Solder paste was also printed 
          such that the bottom edge of the shield was set into the paste.  
          The assembly was then soldered in a hot air reflow oven, yielding 
          a solder connection from the board ground plane to the edge of the 
          shield over its entire perimeter. The shield design incorporated a 
          snap on removable cover.  Therefore, parts inside the fence were 
          not covered during reflow.  If you have any specific questions or 
          need more info please feel free to call me at (516) 595-6667 or e-
          mail any time.
          
          John Wick 
          AIL Systems Inc.

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