N-shaped antenna loops of digitizer tablet for reducing antenna switches and the method for locating the cordless pen

An antenna loops of the digitizer tablet comprising:

• a plurality of physical antenna loops distributed in the digitizer tablet, said plurality of physical antenna loops are separated from each other by a predetermined distance, wherein said each physical antenna loop has a first terminal and a second terminal;
• a plurality of n-shaped logical sections, said each physical antenna loop comprises at least one n-shaped logical section and at least one physical antenna loop comprises said plurality of n-shaped logical sections, wherein said plurality of n-shaped logical sections and the adjacent n-shaped logical sections thereof belong to different physical antenna loops from each other;
• a plurality of antenna switches, each antenna switch is coupled with said first terminal of said antenna loop, wherein said plurality of antenna switches are coupled with a central processing unit in the digitizer tablet;
• and
• a loop arrangement table that is designed in said central processing unit, wherein the distribution of said plurality of physical antenna loops are arranged in accordance with said loop arrangement table.

An arrangement method of the antenna loops of the digitizer tablet for reducing the antenna switches comprising:

• providing a loop arrangement table, said loop arrangement table is designed in a central processing unit of the digitizer tablet;
• distributing a plurality of physical antenna loops in the digitizer tablet and separating said plurality of physical antenna loops with a predetermined distance from each other according to said loop arrangement table;
• forming a plurality of logical sections in at least one physical antenna loop and forming at least one logical section in said each antenna loop wherein said plurality of logical sections and the adjacent logical sections thereof belong to different physical antenna loops from each other;
• coupling said each physical antenna loop with an antenna switch;
• and
• coupling said plurality of antenna switches with said central processing unit to control to switch said plurality of physical antenna loops and said plurality of logical sections thereof.

A method of the digitizer tablet for locating the cordless pen comprising:

• providing a plurality of physical antenna loops that have a plurality of n-shaped logical sections thereof, wherein said plurality of physical antenna loops are distributed in the digitizer tablet according to a loop arrangement table with a plurality of logic addresses that is designed in a central processing unit of the digitizer tablet;
• turning on a plurality of antenna switches of said plurality of physical antenna loops in order by said central processing unit to detect a plurality of signals induced by the cordless pen;
• transmitting said plurality of signals to said central processing unit to determine a first signal, a second signal and a third signal;
• and
• locating the position of the cordless pen by a first signal, a second signal and a third signal according to said loop arrangement table of said central processing unit.