Radio frequency switching circuit with improved bias circuit

The present invention discloses a radio frequency switching circuit with an improved bias circuit. The radio frequency switching circuit comprises a first radio frequency end, a second radio frequency end, a first capacitor, a second capacitor, a radio frequency switch and a bias circuit; the radio frequency switch includes a source, a drain, a gate and an end body, wherein the source is coupled to the first radio frequency end through the first capacitor, the drain is coupled to the second radio frequency end through the second capacitor; and the bias circuit provides first bias voltage, second bias voltage and third bias voltage based on battery voltage, wherein the first bias voltage is larger than the second bias voltage, the second bias voltage is larger than the third bias voltage, and the second bias voltage is coupled to the source and drain of the radio frequency switch; when the radio frequency switch is required to be controlled to be switched on, the first bias voltage is coupled to the gate of the radio frequency switch, and the second bias voltage is coupled to the end body end of the radio frequency switch; and when the radio frequency switch is required to be controlled to be switched off, the third bias voltage is coupled to the gate and end body of the radio frequency switch. Thus, the area of a chip can be decreased, and costs can be reduced.