Aluminum EMI / RF Shield

Abstract

A shield made from aluminum (AL) or an aluminum-based alloy coated with a solderable plating such as nickel or tin provides thermal improvement over existing shielding materials. The shield for circuitry on a circuit board comprising an aluminum material plated with a solderable material, the shield providing electromagnetic interference and radio frequency interference shielding and heat transfer when positioned over a circuit.

What is claimed is: 
     
         1 . A two piece shield attached to a circuit board for providing electromagnetic interference and radio frequency interference shielding and heat transfer when positioned over a circuit, comprising:
 a fence made of a first material, the fence attachable to a circuit board; and   a lid attached to the fence, the lid made of a second material, the second material being different than the first material.   
     
     
         2 . The two piece shield of  claim 1 , wherein the first material is nickel silver. 
     
     
         3 . The two piece shield of  claim 1 , wherein the second material is aluminum. 
     
     
         4 . The two piece shield of  claim 3 , wherein the second material is plated with nickel. 
     
     
         5 . The two piece shield of  claim 3 , wherein the second material is plated with copper. 
     
     
         6 . The two piece shield of  claim 3 , wherein the second material is plated with tin. 
     
     
         7 . The two piece shield of  claim 1 , wherein the lid is snapped on to the fence. 
     
     
         8 . The two piece shield of  claim 1 , wherein the shield comprises a top wall and one or more side walls. 
     
     
         9 . The two piece shield of  claim 6 , further comprising heat dissipating fins attached to the top wall of the shield. 
     
     
         10 . The two piece shield of  claim 1 , wherein the shield is peelable. 
     
     
         11 . The two piece shield of  claim 1 , wherein the shield is non-peelable. 
     
     
         12 . A circuit shield assembly comprising:
 a circuit board including circuitry thereon;   a two piece shield including a fence and a lid, the fence and lid containing aluminum plated with a solderable material, the fence attached to the circuit board enclosing at least a portion of the circuitry, the two piece shield transferring heat generated by the circuitry.   
     
     
         13 . The two piece shield of  claim 12 , wherein the aluminum comprises an aluminum based alloy. 
     
     
         14 . The two piece shield of  claim 12 , wherein the solderable material comprises at least one of nickel, copper, and tin. 
     
     
         15 . The two piece shield of  claim 14 , wherein the shield further comprises heat dissipating fins attached to the top wall. 
     
     
         16 . The two piece shield of  claim 12 , wherein the shield is peelable. 
     
     
         17 . The two piece shield of  claim 12 , wherein the shield is non-peelable. 
     
     
         18 . A two piece shield attached to a circuit board for providing electromagnetic interference and radio frequency interference shielding and heat transfer when positioned over a circuit, comprising:
 a fence made of a non-aluminum material, the fence attachable to a circuit board; and   a lid attached to the fence, the lid made of an aluminum material plated with a solderable material.   
     
     
         19 . The two piece shield of  claim 18 , wherein the lid is peelable. 
     
     
         20 . The two piece shield of  claim 19 , wherein the fence is configured to receive a snap-fit replacement lid if the peelable lid is removed.