Radio frequency IC tag and bolt with an IC tag
AssigneeHitachi, Ltd.
InventorsIsao Sakama, Minoru Ashizawa
Life of this patent
Estimating the term…
Abstract
A radio frequency IC tag includes an antenna substrate accommodated on a bottom portion of an outer casing and an antenna radiation portion mounted on a surface of the antenna substrate. These parts are encapsulated by a sealing agent. An IC chip is disposed at a substantial center on a backside of the antenna substrate. A ground pattern connected to an electrode terminal of the IC chip is formed in an area, on which the IC chip is not mounted. A through electrode passes through the antenna substrate from its back surface to above its front surface at a position slightly offset from the center thereof. The through electrode is connected to the antenna radiation portion on the front surface and to the electrode terminal of the IC chip on the back surface.
Claims18
A radio frequency IC tag including an IC chip for storing information and an antenna of a microstrip structure for transmitting wirelessly the information stored on the IC chip, the radio frequency IC tag comprising:
- an antenna substrate, on a first surface of which the IC chip is mounted at a substantial center of the first surface, and which has a ground pattern formed over a remainder of the first surface and electrically connected to a first electrode terminal of the IC chip, the antenna substrate having a predetermined dielectric constant;
- an antenna radiation portion mounted on a second surface of the antenna substrate and electrically connected to a second electrode terminal of the IC chip;
- and
- a metallic outer casing accommodating therein the antenna substrate and the antenna radiation portion,
- wherein a height of the antenna radiation portion is set to a value greater than a machining margin, and
- wherein said ground pattern is formed within the metallic outer casing, and separated from the metallic outer casing by a predetermined space.
A metallic bolt with an IC tag including an IC chip for storing information and a monopole antenna for transmitting wirelessly the information stored on the IC chip,
- wherein a hole adapted to receive the radio frequency IC tag is formed in a head of the metallic bolt and the radio frequency IC tag is received in the hole, and
- wherein the monopole antenna includes a disk disposed at a position corresponding to a surface of the head of the metallic bolt, and a connection wire is extended from a center of the disk and connected to an electrode terminal of the IC chip.
The bolt with an IC tag including an IC chip for storing information and an antenna for transmitting wirelessly the information stored on the IC chip,
- wherein a hole adapted to receive the radio frequency IC tag is formed in a head of the bolt and the radio frequency IC tag is received in the hole, and
- wherein the antenna includes a disk disposed at a position corresponding to a surface of the head of the bolt, a connection wire is extended from a center of the disk and connected to an electrode terminal of the IC chip, a distance between the disk and the electrode terminal of the IC chip is set to λ/4 when a wavelength of a radio wave to be used on an antenna substrate is λ, and the antenna constitutes a monopole antenna.
A radio frequency IC tag including an IC chip for storing information and an antenna of a microstrip structure for transmitting wirelessly the information stored on the IC chip, the radio frequency IC tag comprising:
- an antenna substrate having a predetermined dielectric constant, said substrate having the IC chip mounted on a first surface thereof, and having a ground pattern formed over a portion of the first surface, said ground pattern being electrically connected to a first electrode terminal of the IC chip;
- an antenna radiation portion mounted on a second surface of the antenna substrate and electrically connected to a second electrode terminal of the IC chip;
- and
- metallic outer casing accommodating therein the antenna substrate and the antenna radiation portion,
- wherein a height of the antenna radiation portion is set to a value greater than a machining margin, and
- wherein said ground pattern is formed within the metallic outer casing, and separated from the metallic outer casing by a predetermined space.
Dependencies are inferred from the claim text.