PCB circuit board and mobile communication device thereof

This scheme relates to a PCB circuit board and mobile communication device thereof, wherein is provided with power cord, ground wire, clock signal line and FM signal line etc. On the PCB circuit board, the FM signal line is walked the line width and is equalled with 50 ohmic resistance line live widths of radio frequency, it is used for carrying on signal shielded ground wire to be provided with around the FM signal line, the twice of line width is walked to the minimum of distance between FM signal line and the ground wire for the FM signal line. This scheme sets up to equalling with 50 ohmic resistance line live widths of radio frequency through walking the FM signal line line width, sets up the ground wire simultaneously and carry out the signal shielding around the FM signal line, and the electromagnetic interference that reduces around the FM signal line components and parts and walk the tape has reduced the transmission line simultaneously and has crosstalked, improves the interference immunity of FM si