| 摘要 |
The invention discloses a PCB ( 100, 400 ) with first and second main surfaces ( 110, 130 ), the PCB also having a first height, h, said two surfaces and height together defining the volume of the PCB. The PCB comprises layers ( 430, 434, 438 ) of a first supporting laminate material, layers ( 440, 431, 433, 435, 437, 439 ) of a first conducting material and layers ( 432, 436 ) of a first prepreg, said first materials and prepreg having respective dielectrical constants and dissipation factors. In the PCB, a sub-volume of the PCB defined by a sub-area ( 120 ) within the first main surface and a sub-height (h') within said first height together comprise a sub-PCB ( 320 ) which comprises at least one layer ( 330, 334 ) of a second supporting laminate material, said second laminate material differing from the first laminate material with regard to at least one of the factors dielectrical constant and dissipation factor.
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