Plug-in card for radio communication and interference suppression device for use with a plug-in card

摘要

Card (1) has an antenna (2) connected to a send and receive device. The antenna (2) extends from an electrically conducting body (3) of the card (1). An electrically conducting arm (4) connects to antenna (2) and body (3) and has length equal to one quarter of the radio communication wavelength. During communication the arm is positioned to minimize electrical interference to the card holder. To minimize interference the arm is positioned so that is in resonance and an electrical field that arises at the conducting body (3) due to the radio transmission is minimized and therefore any interference to the computer containing the card is minimized.