We are iterating a device whose metal chassis is internally connected to an ESD guard ring that is connected to the PCB signal ground through a 0Ohm resistor in a single point close to the power connector (image A). It also has two USB connectors and one RJ45 connector with their chassis connected to this guard ring. Everything has worked very well with this device.
Now we have added five SMA connectors to this device and we are not sure how to connect the ground pins of these SMA connectors with the signal ground of the PCB.
Since the SMA connectors have a metal body, if we connect them directly to signal ground they will be grounding the metal chassis of the device.
Do we have to connect the body of the SMA connectors directly to signal ground, connect the chassis of the device directly to signal ground and not have the ESD guard ring? (image B).