Title:
ANTENNA UNIT
Document Type and Number:
Japanese Patent JPH07154130
Kind Code:
A
Abstract:
PURPOSE: To obtain an antenna device the characteristic of which is more balanced by means of at least the same high local radiative capacity. CONSTITUTION: The antenna device has antenna wire loops which are twisted twice by 180 deg. so as to constitute two electrically outside partial loops 1 and 3 and one electrically central partial loop 2. One 3 of the two electrically outside partial loops 1 and 3 is spatially positioned between the electrically central partial loop 2 and the other electrically outside loop 1. An impedance element 11 is spatially connected to two nodes 9 and 10 positioned to the entrance and exit of the central partial loop 2. This antenna device has a very balanced characteristic and, when an appropriate parameter is selected, operates in the same way as the antenna having nearly two to 2×1/2 partial loops at the resonance frequency of a tag to be detected does.
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Inventors:
FUIRITSUPU MIYURAA
Application Number:
JP14953694A
Publication Date:
June 16, 1995
Filing Date:
June 30, 1994
Export Citation:
Assignee:
ACTRON ENTWICKLUNGS AG
International Classes:
G08B13/24; H01Q7/04; (IPC1-7): H01Q7/04; G08B13/24
Attorney, Agent or Firm:
Hayakawa Masaname