| 摘要 |
<p>PURPOSE:To obtain a printed-wiring board for enabling an area between wiring patterns of each functional block to be shielded by printed wiring by providing a through-hole for mutually connecting a ground pattern layer so that the function block can be divided. CONSTITUTION:A wining pattern 28 of a control block A is held in sandwich shape by a ground pattern 24 and a ground pattern 25, it is isolated from a receiving part B through a through-hole 37, and a control part A is completely shielded from other functional blocks. Also, a wiring pattern 29 of the receiving part B is surrounded by the ground pattern 25 and 26 and the through-holes 37 and 38 and are completely shielded from other functional blocks, and a wiring pattern 30 of a transmission part C is shielded from the receiving part B through ground patterns 16 and 17 and the through-hole 38, thus enabling malfunction of a radio device due to interference between functional blocks, generation of spurious, and increase in noise to be restricted and achieving high-performance, compactness, and low cost of the ratio device.</p> |
