| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a low loss pattern structure of a multilayer printed board capable of high speed transmission by using a board insulator material, by minimizing the apparent permittivity involved in signal transmission, thereby reducing dielectric loss which becomes more dominant than conductor loss in signal transmission at 5 GHz or above. <P>SOLUTION: The low loss pattern structure comprises, in a strap line for transmitting a high speed signal, a signal pattern 5, insulator layers 3, 4 formed to sandwich the signal pattern 5 from above and below, ground conductors 1, 2 attached to both surfaces of the insulator layers 3, 4, and cavities 6 formed in the insulator layers at an interval equal to or less than 1/10 of the fundamental wavelength of the high speed signal and having a diameter smaller than the width of the signal pattern 5. <P>COPYRIGHT: (C)2012,JPO&INPIT |
