Slitted pcb for omni-directional like performance of off-center mounted antennas of passive access systems

A radio frequency (RF) circuit comprising:

• an antenna;
• a printed circuit board comprising a stack of layers, wherein the stack of layers includes a grounded layer and a slit that extends through the stack of layers,
• wherein
• the grounded layer comprises a dielectric area, a first grounded area and a second grounded area,
• the dielectric area includes dielectric material and is disposed between the first grounded area and the second grounded area, and
• the antenna is mounted to the ground layer adjacent the dielectric area and offset from a centerline of the ground layer, and
• the second grounded area is disposed between the dielectric area and the slit, wherein a width of the second grounded area between the dielectric area and the slit is within a predetermined range of a width of the first grounded area between the dielectric area and an edge of the grounded layer;
• and
• a RF chip mounted to the stack of layers and connected to the antenna via a transmission line and configured to transmit and receive RF signals via the antenna.