include a user input interface for receiving data from a user such as a keyboard a keypad a touchpad a button a mouse a camera and a microphone the interface 230 may include a user output interface for outputting data to the user such as a speaker a monitor a lamp and a liquid crystal display device the modem 240 may modulate data to be transmitted through radio communication and may demodulate data received through radio communication the modem 240 may perform the modulation and demodulation operations according to communication schemes such as amplitude modulation am frequency modulation fm phase modulation pm amplitude shift keying ask frequency shift keying fsk phase shift keying psk code division multiple access cdma and orthogonal frequency division multiplexing ofdm the modem 240 may perform radio communication according to various radio communication standards such as bluetooth and wifi the bus 250 provides a channel between the processor 210 the memory 220 the interface 230 and the modem 240 the radio communication antenna 100 is connected to the modem 240 the radio communication antenna 100 may convert an electric signal transmitted from the modem 240 into a radio signal in order to propagate the radio signal through the atmosphere the radio communication antenna 100 may convert the radio signal propagated through the atmosphere into the electric signal in order to transmit the electric signal to the modem 240 as described above with reference.