Built-in antenna for radio communication terminals

摘要

The built-in antenna for radio communication terminals of the present invention includes a loop antenna with a circumference of approximately one wavelength or less placed at an extremely short distance compared with the wavelength from the plane of the terminal board so that its loop plane may be perpendicular to the plane of said terminal bottom board which is opposite to the human body during communication, and a balanced/unbalanced conversion circuit with an impedance conversion function that supplies power to this loop antenna.