Patent ID: 8174453

Claim:
A folder-type mobile communication device, comprising: a first dielectric substrate; a first ground plane, disposed on a surface of the first dielectric substrate; an antenna element, located near the first ground plane, electrically connected to a signal source on the first dielectric substrate; a second dielectric substrate; a second ground plane, disposed on a surface of the second dielectric substrate; a metal line, wherein the second ground plane is electrically connected to the first ground plane through the metal line; and a band-stop circuit, located either on the first ground plane or on the second ground plane, the band-stop circuit including: a slit, located near the metal line; a capacitive element, arranged across the slit, wherein two ends of the capacitive element are respectively electrically connected to two sides of the slit; and an inductive element, arranged across the slit, wherein two ends of the inductive element are respectively electrically connected to two sides of the slit, such that the inductive element and the capacitive element form a parallel LC resonant circuit, and the band-stop circuit generates a parallel resonance at a specified frequency.