Title:
COMMUNICATION EQUIPMENT
Document Type and Number:
Japanese Patent JP2004222122
Kind Code:
A
Abstract:
To suppress the occurrence of a standing wave by performing an impedance matching of a loop antenna and transmission lines.
A resistor 41 is connected to the transmission lines L1 and L2 of a reader/writer 31 in parallel with the loop antenna 11. A resistance value of the resistor 41 is a value at which the impedance of the loop antenna 11 is equal to the characteristic impedance of the transmission lines L1 and L2. As a result, it is possible to suppress the occurrence of a standing wave on the loop antenna 11.
Inventors:
ARISAWA SHIGERU
SUZUKI MAMORU
YOSHIDA YUKO
MIYAGAWA YOICHI
SUZUKI MAMORU
YOSHIDA YUKO
MIYAGAWA YOICHI
Application Number:
JP2003009318A
Publication Date:
August 05, 2004
Filing Date:
January 17, 2003
Export Citation:
Assignee:
SONY CORP
International Classes:
H04B5/02; G06K17/00; (IPC1-7): H04B5/02; G06K17/00
Attorney, Agent or Firm:
Yoshio Inamoto