Title:
アンテナ装置及びリーダライタ
Document Type and Number:
Japanese Patent JP4571555
Kind Code:
B2
Abstract:
An antenna apparatus which ensures a wide reading area on a reader antenna and a reading operability of information recorded in a small-sized radio frequency (RF) IC tag (6) is provided. The apparatus includes an auxiliary antenna (4) of »/2 long disposed near to a radiating antenna (3) of »/2 long and including plural conductive elements in an array. When the IC tag approaches the auxiliary antenna (4), a subsidiary tuning circuit is formed between it and an inlet antenna (6') of IC tag (6), so making tuning complementary to each other. The inlet antenna (6') having an antenna length shorter than the tuning frequency can receive energy from the auxiliary antenna (4) efficiently and is excited integrally with the auxiliary antenna to thereby spread a reading area (7) by apparatus (1) and increase the communication distance.
Inventors:
Sakama Isao
Minoru Ashizawa
Minoru Ashizawa
Application Number:
JP2005244375A
Publication Date:
October 27, 2010
Filing Date:
August 25, 2005
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
H01Q9/28; G06K17/00; H01Q1/38; H01Q13/08; H01Q19/24; H01Q19/30; H04B1/59; H04B5/02
Domestic Patent References:
| JP2005223730A | ||||
| JP2006081144A | ||||
| JP2005333556A | ||||
| JP200571179A | ||||
| JP5299927A |
Attorney, Agent or Firm:
Isono Dozo