ANTENNA

PURPOSE:To facilitate miniaturization by providing a dielectric board, an input output electrode, a lead electrode, a connection electrode, a metallic cap and a coil shaped metallic wire connected between the connection electrode and the metallic cap to the antenna. CONSTITUTION:A solid electrode 7 is formed to an upper face of a dielectric board 1 and a circumferential ridge of an opening of a metallic cap 8 is fixed onto the electrode 7 by solder. A connection electrode 4 on the board 1 and an upper wall 8a of the cap 8 are interconnected by a coil shaped metallic wire 9 to form the antenna 10. The input output electrode 3 of the antenna 10 acts as feeding point and a radio wave is sent/received to/from the cap 8 via the metallic wire 9. Since the metallic wire 9 acting as a transmission reception section is formed to be a coil in the antenna 10, the size of the antenna is made small easily even when the length is 1/10 wavelength or over. Furthermore, the antenna fixed to the printed circuit board and external connection are implemented by a support electrode 2 and the electrode 3 on the side face of the board, then the bottom of the board 1 is made flat and the board 1 is surface-mounted on the printed circuit board.