A structure of circuit boards for a wireless communication apparatus, comprising a first radio-frequency circuit board provided with circuit devices for transmitting and receiving radio-frequency signals at a first frequency band mounted on the first radio-frequency circuit board; and a baseband circuit board provided with a baseband processor and a media access control for supporting the operation of radio-frequency circuit board, wherein the baseband circuit board is adapted to support different radio-frequency modules when the first radio-frequency circuit board is replaced with a second radio-frequency circuit board provided with circuit devices for transmitting and receiving radio-frequency signal at a second frequency band that is different than the first frequency band. In an alternate embodiment, the radio-frequency circuit board is not replaced but, instead, the RF circuit board and baseband circuit board are reprogrammed. The design of the baseband circuit board is irrelevant to the type of the circuit devices mounted on said radio-frequency circuit board so as to prevent the baseband circuit board from being affected by replacement of the radio-frequency circuit board.