ANTENNA, RADIO CLOCK USING THE SAME, KEYLESS ENTRY SYSTEM, AND RFID SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a small-sized and sensitivity easily adjustable antenna obtaining a high-sensitivity output by solving a problem of eddy current loss without enlarging an installation area regarding a magnetic sensor type antenna disposed within a metallic housing, and also to provide a high-S/N antenna.

SOLUTION: The present invention relates to an antenna which is comprised of a main magnetic path member 1a wherein a coil is wound around a magnetic core and an S/N is (S/N)Obetween a signal output voltage S obtained by electrically resonating the coil and a noise voltage N, and a sub magnetic path member 3a which is magnetically connected with the magnetic core to constitute a substantial closed magnetic path including the coil, and in which an S/N is (S/N)iand (S/N)iis greater than (S/N)O.

COPYRIGHT: (C)2007,JPO&INPIT