About EMI design in a stacked relationship

Circuit board PCB laminate arrangement is designed on the basis of the overall system. If stacked design flaws that will ultimately affect the machine's EMC performance. Overall laminate designed primarily to follow two rules:
1 Each alignment layer must have an adjacent reference layer (power or ground);
(2) adjacent to a main power and ground to maintain the minimum distance, in order to provide a greater coupling capacitance; listed below from two to ten plates stacked laminates:lcd module
2.1 single-sided and double-sided laminated; For two-layer board, because the board layers less, does not exist laminated issue. Control EMI radiation mainly from the wiring and layout considerations; single plate and double plate electromagnetic compatibility problems are becoming increasingly prominent. The main reason for this phenomenon is the result of the signal loop area is too large, not only produces a strong electromagnetic radiation, but also make the circuit sensitive to external interference. To improve the electromagnetic compatibility of the line, the easiest way is to reduce the area of ​​the loop key signals. Key signal: From the EMC point of view, mainly referring to the key signal generating strong radiation sensitive signal and the signal to the outside world. The signal can produce strong radiation is generally periodic signals such as clock signals or address low. Susceptible to interference signals are those of the analog signal level is low. Single, double plate usually below the low frequency of 10KHz analog design:  at the same level of power traces in radial alignment, and minimize the total length of the line;  take power, ground when close to each other; line at the edge of cloth a key signal ground, this ground should be as close signal lines. Thus forming a small loop area, reducing the differential-mode radiation sensitivity to external interference. When the signal lines plus a ground side, the smallest area to form a loop, the signal via the loop current will certainly, and not some other ground paths.  If the double circuit board, the other side of the circuit board, immediately adjacent to the lower signal line, a ground fabric along the signal line, as more wide line. This loop area formed by multiplying the thickness equal to the circuit board signal line length.lcd graphic display