I am designing a capacitive touch keypad using cypress MBR series. The design guide has an excel spreadsheet to help with max trace length and button dia requirements. The idea is to keep the button + trace capacitance in a working range. For the same, they have mentioned capacitance per inch of trace length in pF as shown in table below:
There is no mention of trace width in the document (64 mils appears to be the pcb thickness because it's equal to 1.6mm - one of the standard pcb thickness).
Is trace capacitance per unit length is independent of trace width?
Is there any recommended trace width that I should use or can I use anything as per my convenience?