Signal transmission device and cable connecting circuit

A signal transmission device, comprising:

• a radio frequency processing circuit, coupled to a first connecting end of a radio frequency cable, wherein the radio frequency processing circuit has a first transceiver end and a second transceiver end, wherein the first transceiver end is coupled to a first conductor in the radio frequency cable and the second transceiver end is coupled to a second conductor in the radio frequency cable;
• and
• a cable connecting circuit, coupled to a second connecting end of the radio frequency cable, a radio frequency transceiver, and a radio frequency antenna controller,
• wherein the cable connecting circuit comprises:
• a first choke inductor, having one end coupled to a transceiver end of the radio frequency transceiver, another end coupled to a first control end of the radio frequency antenna controller, and the transceiver end being coupled to the first conductor;
• a first bypass capacitor, coupled between the another end of the first choke inductor and a digital ground terminal;
• a first coupling capacitor, coupled between the digital ground terminal and a radio frequency ground terminal, wherein the second conductor is coupled to the radio frequency ground terminal and a second control end of the radio frequency antenna controller at the second connecting end of the radio frequency cable;
• and
• a second bypass capacitor, coupled between the second control end of the radio frequency antenna controller and the digital ground terminal.