Low frequency and direct current signal blocking device and antenna

A low frequency and direct current (“DC”) signal blocking device, characterized in that the low frequency and DC signal blocking device comprises:

• a dielectric substrate layer;
• a low frequency and DC signal blocking transmission line on a first surface of the dielectric substrate layer, wherein the low frequency and DC signal blocking transmission line has an input end and an output end;
• a metal layer on a second surface of the dielectric substrate layer, wherein the dielectric substrate layer is disposed between the low frequency and DC signal blocking transmission line and the metal layer, wherein there is at least one gap in the metal layer such that the metal layer is separated into at least a first sub-region and a second sub-region that is spaced apart from the first sub-region by the at least one gap, wherein the at least one gap is configured to block at least one of a low frequency signal and a DC signal and not block radio frequency (“RF”) signals;
• and
• a metal plate, wherein a dielectric layer is disposed between the metal plate and the metal layer,
• wherein the first sub-region and the second sub-region form two electrodes of a first capacitor.