Patent ID: 7453703
Filing Date: 2008-11-18
Classification: H01L,H03H,H05K,Y10T

Abstract:
1. A printed circuit board having printed circuit patterns formed on one surface thereof and external contact terminals formed on the other surface thereof; a surface acoustic wave chip mounted on the one surface of said printed circuit board such that a cavity with gas required by the surface acoustic wave chip is formed between itself and the printed circuit board a flip-chip large scale integration mounted on the one surface of said printed circuit board in a face-down manner, and a sheet-like sealing material covering said surface acoustic wave chip and said large scale integration wherein a gap between said flip-chip large scale integration and said printed circuit board is filled with an underfill material wherein said cavity is hermetically sealed by bringing said sheet-like sealing material in close contact with the printed circuit board by heating; and wherein said hermetically sealed surface acoustic wave chip and said flip-chip large scale integration filled with said underfill material adhered to said printed circuit board at peripheral portions thereof by said sheet-like sealing material and are directly covered with said sheet-like sealing material.