Patent ID: 8659365

Claim:
A common mode noise suppression circuit applicable to suppress a common mode noise when transmitting a differential signal, comprising: a reference potential structure formed from a conductor; a differential transmission structure disposed to form an electromagnetic coupling with the reference potential structure, wherein the differential transmission structure has two transmission conductors for transmitting the differential signal, and the two transmission conductors respectively form the electromagnetic coupling with the reference potential structure so as to form a transmission line characteristic to prevent differential mode transmission from being affected when transmitting the differential signal; a ground layer electrically connected to a ground potential; and a ground structure electrically connected to the reference potential structure and the ground layer for forming an inductance-capacitance resonant structure together with the electromagnetic coupling formed by the reference potential structure and the differential transmission structure, and an inductance formed by the ground structure itself, so as to suppress a common mode signal at a specific frequency, wherein the two transmission conductors are coplanar, and are disposed to be parallel or symmetric to each other, and wherein a dielectric material or a ferromagnetic/ferrimagnetic material layer is further disposed between the reference potential structure and the differential transmission structure.