INTERNAL ANTENNA FOR TAG OF REAL TIME LOCATION SYSTEM

摘要

PURPOSE: An antenna device for a tag of a global positioning system is provided to secure reliability of the position estimation by uniformly receiving the signal transmitted from a reader in all directions. CONSTITUTION: A first antenna(11) forms a one-way radiation pattern. A second antenna(12) forms the radiation pattern to the different direction from the first antenna. A switching unit(15) is switched according to an external control signal and forms an isotropic radiation pattern by alternatively connecting the first antenna and the second antenna. The first and second antennas are plated on the different positions on the circuit board with a preset angle. The first antenna is plated on the upper edge of the circuit board.