A signal transmission and reception circuit comprising: a coil for transmitting and receiving signals; a filter for filtering a signal; a power processing module; and a transmission and reception control module comprising a signal conversion switching circuit connected to the power processing module and the coil, wherein the signal conversion switching circuit is configured, based on a switching state of the signal conversion switching circuit, to rectify power wirelessly received through the coil and deliver the rectified power to the power processing module when the signal transmission and reception circuit is in a wireless power reception state, and to convert a signal received from the power processing module into a communications signal and deliver the communications signal to the filter when the transmission and reception circuit is in a communications transmission state, and a driver configured to control the switching state of the signal conversion switching circuit in accordance with the state of the transmission and reception circuit, wherein the filter is connected to the coil and is configured to shape the communications signal provided by the signal conversion switching circuit into a specific communications signal for transmission through the coil, wherein the filter is conditionally connected to the signal conversion switching circuit dependent upon the state of the transmission and reception circuit. a coil for transmitting and receiving signals; a filter for filtering a signal; a power processing module; and a transmission and reception control module comprising a signal conversion switching circuit connected to the power processing module and the coil, wherein the signal conversion switching circuit is configured, based on a switching state of the signal conversion switching circuit, to rectify power wirelessly received through the coil and deliver the rectified power to the power processing module when the signal transmission and reception circuit is in a wireless power reception state, and to convert a signal received from the power processing module into a communications signal and deliver the communications signal to the filter when the transmission and reception circuit is in a communications transmission state, and a driver configured to control the switching state of the signal conversion switching circuit in accordance with the state of the transmission and reception circuit, wherein the filter is connected to the coil and is configured to shape the communications signal provided by the signal conversion switching circuit into a specific communications signal for transmission through the coil, wherein the filter is conditionally connected to the signal conversion switching circuit dependent upon the state of the transmission and reception circuit. a signal conversion switching circuit connected to the power processing module and the coil, wherein the signal conversion switching circuit is configured, based on a switching state of the signal conversion switching circuit, to rectify power wirelessly received through the coil and deliver the rectified power to the power processing module when the signal transmission and reception circuit is in a wireless power reception state, and to convert a signal received from the power processing module into a communications signal and deliver the communications signal to the filter when the transmission and reception circuit is in a communications transmission state, and a driver configured to control the switching state of the signal conversion switching circuit in accordance with the state of the transmission and reception circuit, wherein the filter is connected to the coil and is configured to shape the communications signal provided by the signal conversion switching circuit into a specific communications signal for transmission through the coil, wherein the filter is conditionally connected to the signal conversion switching circuit dependent upon the state of the transmission and reception circuit.