Antenna, and radio-controlled timepiece, keyless entry system and RFID system using same

Antenna, and radio-controlled timepiece, keyless entry system and RFID system using same

An antenna comprising a magnetic main-path member comprising a coil wound around a magnetic core, and a magnetic sub-path member magnetically connected to the magnetic core for constituting a substantially closed magnetic path with the magnetic main-path member, the antenna meeting the relation of (...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: ARAKI HIROKAZU,MITSUMATA CHIHARU,MITA MASAHIRO
Format: Patent
Sprache:eng
Schlagworte:
ACCESSORIES THEREFOR
ANTENNAS, i.e. RADIO AERIALS
BASIC ELECTRIC ELEMENTS
CALCULATING
COMPUTING
COUNTING
ELECTRICITY
FIXED CONSTRUCTIONS
HANDCUFFS
HANDLING RECORD CARRIERS
HOROLOGY
KEYS
LOCKS
PERFORMING OPERATIONS
PHYSICS
PRESENTATION OF DATA
RADIO-CONTROLLED TIME-PIECES
RECOGNITION OF DATA
RECORD CARRIERS
SAFES
TRANSPORTING
VEHICLES IN GENERAL
VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR
WINDOW OR DOOR FITTINGS
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Beschreibung
Zusammenfassung:An antenna comprising a magnetic main-path member comprising a coil wound around a magnetic core, and a magnetic sub-path member magnetically connected to the magnetic core for constituting a substantially closed magnetic path with the magnetic main-path member, the antenna meeting the relation of (S/N)1>(S/N)0, wherein (S/N)1 is a ratio of a signal voltage S obtained from the coil to a noise voltage N in this antenna, and (S/N)0 is a ratio of a signal voltage S to a noise voltage N in an antenna having the same structure except for having no magnetic sub-path member.