ANTENNA DEVICE AND ANTENNA DEVICE MANUFACTURING METHOD

WIPO Patent Application WO/2004/084348

A1

An antenna device having a loop antenna with a good noise resistance performance. The loop antenna is composed of a loop conductor section formed of a looped conductive wire and a shield member covering the loop conductor section. The antenna device is connected to a receiving circuit at two terminals. The loop conductor section has a non-covered portion corresponding to the portion of the conductive wire including the reference position with respect to which the two terminals are symmetrical. Thus, a balancing shield structure is created. A line for connecting one end of the conductive wire to the ground potential and a line for connecting the shield member to the ground potential are separately provided. The voltage drop due to the common impedance is hardly received by the antenna.

MORIOKA SUSUMU (JP)
TAKANO TAKASHI (JP)
SAEGUSA SHIGERU (JP)

PCT/JP2004/003214

September 30, 2004

March 11, 2004

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SONY CORP (JP)
MORIOKA SUSUMU (JP)
TAKANO TAKASHI (JP)
SAEGUSA SHIGERU (JP)

H01Q1/52; H01P11/00; H01Q7/02; H01Q7/04; (IPC1-7): H01Q7/04

JPS5627509A	1981-03-17
US5883574A	1999-03-16
US1673429A	1928-06-12
JP2002190705A	2002-07-05
DE618511C	1935-09-10
DE3140319A1	1983-04-21
EP0766200A2	1997-04-02
US2465381A	1949-03-29
US2349154A	1944-05-16
JPS5752118B2	1982-11-05

"Electrostatic Shielded Magnetic Loop Antenna", IBM TECHNICAL DISCLOSURE BULLETIN, vol. 32, no. 1, June 1989 (1989-06-01)

Nakamura, Tomoyuki c/o Miyoshi International Patent Office (Toranomon Kotohira Tower 2-8, Toranomon 1-chom, Minato-ku Tokyo, JP)

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