In order to design a high quality and producible flexible printed circuit board, below principles should be taken into consideration:

1> First of all, take some valuable literature as reference. The most valuable literature is IPC standard or Military standard, for instance, if flexible PCB would apply on area of military/aerospace, can view IPC-6013 and IPC-2223 or MIL-P-50884.

2> Circuit parameter should be determined by package of circuit pattern, it could be helpful to draw and cut out a paper template sample of flexible circuit board. According to the flexibility and profiling template experiment can achieve the highest efficiency. Design the biggest circuit network, can make a template comprise as much circuits as possible.

3> Fix the layout drawing and circuit routes, it can decide the amount of conductor layer. Cost of circuit board increase accompany with the amount if circuit board layer. For instance, 2 double layer printed circuit board could be cheaper than 1 four layer printed circuit board.

4> Calculate circuit wire width and space according to the current load bearing capability and voltage.

5> Decide the type of base material;

6> Choose the way of how to end circuit and size of through-hole, evaluate the method of ending circuit and flexibility area, to make sure if stiffner is necessary.

7> Quit all the test method, avoid to use components out of specification to low down total cost.

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