To improve an antenna gain when portable equipment on which radio equipment is mounted is held in 4 hand, or placed on a metallic desk.
A Bluetooth adapter 106 being radio equipment is provided with an upper connected part 107 connected to the upper part of the main body of a portable telephone set 101 being portable equipment, a lower connected part 108 connected to a connector 105 at the lower part of the main body of the portable telephone set 101, a radio circuit part 112 arranged along the back side of the main body of the portable telephone set 101 in a connecting part 109 for connecting both connected parts at the back side of the main body of the portable telephone set 101, and a mono-pole antenna 114 being a built-in antenna element arranged in a lower connecting part 110 whose radiation edge is extended through the lower part of the connector 110 toward the front side of the main body of the portable telephone set 101. Therefore, it is possible to improve the gain of the built-in antenna element even at the time of gripping the whole part of the Bluetooth adapter 106 and the portable telephone 101 on which this adapter is mounted.
NISHIKIDO TOMOAKI
SAITO YUTAKA
KOYANAGI YOSHIO
