Antenna and RFID tag

摘要

An antenna includes a first loop, a second loop which encloses an outer side of the first loop and is separated from the first loop by a slit and both end of which are merged with both ends of the first loop, and IC chip connection parts provided in a portion where the first loop and the second loop are merged, wherein a loop length of the first loop and a loop length of the second loop are equal to or shorter than one third of a wavelength corresponding to a desired frequency resonant with an IC chip connected to the IC chip connection parts.

主权项

1. An antenna comprising:
a first loop; a second loop which encloses an outer side of the first loop and is separated from the first loop by a slit, and both ends of which are merged with both ends of the first loop; and IC chip connection parts provided in a portion where the first loop and the second loop are merged, wherein a mounting area of the antenna is equal to a mounting area of the second loop; a loop length of the first loop and a loop length of the second loop are equal to or shorter than one third of a wavelength corresponding to a desired frequency resonant with an IC chip connected to the IC chip connection parts, an inductance of the first loop and a capacitance of the IC chip are resonant at the desired frequency, a wire length of the second loop is formed in accordance with a size demanded for the antenna, and the wire width of the second loop is formed to be thicker than a wire width of the first loop in accordance with a size of the first loop resonant at the desired frequency and a predetermined width of the slit.