Built-in antenna for radio communication terminals
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHideo Itoh, Kiyoshi Egawa
Life of this patent
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Abstract
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.
Claims27
A built-in antenna for a radio communication terminal, comprising:
- a terminal bottom board, comprising a grounded conductor;
- a helical di-pole antenna, connecting to said terminal bottom board and being positioned so that a plane of said helical di-pole antenna is perpendicular to a plane of said terminal bottom board, said helical dipole antenna having a diameter not exceeding 0.1 wavelength;
- and
- a balanced/unbalanced conversion circuit, comprising an impedance conversion system and connecting to a feeding end of said helical di-pole antenna;
- wherein said terminal bottom board reflects an electromagnetic wave from said helical di-pole antenna in a direction away from a user;
- and
- wherein said balanced/unbalanced conversion circuit minimizes an antenna current flowing to said terminal bottom board.
A built-in antenna for a radio communication terminal, comprising:
- a terminal bottom board, comprising a grounded conductor;
- a loop antenna, connecting to said terminal bottom board and being positioned so that a loop plane of said loop antenna is perpendicular to a plane of said terminal bottom board;
- and
- a balanced/unbalanced conversion circuit, comprising an impedance conversion system and connecting to a feeding end of said loop antenna;
- wherein said terminal bottom board reflects an electromagnetic wave from said loop antenna in a direction away from a user;
- and
- wherein said balanced/unbalanced conversion circuit minimizes an antenna current flowing to said terminal bottom board.
Dependencies are inferred from the claim text.