| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-frequency circuit device board which is capable of preventing electromagnetic waves originated from the interconnect lines of an inner circuit from having an adverse effect on nearby parts, interconnect lines, and electrical signals flowing through them before the electromagnetic waves reach to an electromagnetic wave absorber; and to provide an electromagnetic wave absorber which absorbs only electromagnetic waves originated from the interconnect lines and is adjusted in attenuation volume so as not to absorb electrical signals flowing through the above interconnect lines and not to influence the electric signals flowing through the interconnect lines, can be easily provided, has electromagnetic wave absorbing properties which can be adjusted by changing the arithmetic average surface roughness (Ra) of its surface confronting the circuit interconnect lines, and has various kinds of electromagnetic wave absorbing properties. SOLUTION: The high-frequency circuit device board (hereafter referred to as a device board) 1 is connected to various electronic parts through interconnect lines 3 laid on a board 2. Electromagnetic waves originating from the interconnect lines 3 are absorbed by the electromagnetic wave absorber 4 which is provided so as to cover the interconnect lines 3. After the circuit interconnect lines 3 are laid on the board 2, the electromagnetic wave absorber 4 is mounted on the interconnect lines 3. COPYRIGHT: (C)2005,JPO&NCIPI
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