Title:
TUNABLE ANTENNA DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/002025
Kind Code:
A1
Abstract:
Disclosed is a tunable antenna device which secures gain while being a miniaturized antenna of a narrow area for which distortion never occurs under high fields. The tunable antenna device (3) of the third embodiment is provided with a first loading coil (11-1) connected to an antenna (10) and a second loading coil (11-2) which are serially connected. As a result, even if the impedance value of the first loading coil (11-1) is lowered, the antenna (10) resonates in a broadcast band of FM radio by way of the effect of the second loading coil (11-2). In addition, an AGC circuit (13') is connected from between the loading coils (11-1 and 11-2) to a ground. Furthermore, a tuned circuit (12) is connected between the second loading coil (11-2) and an output terminal (OUT), whereupon a received signal from the tunable antenna device (3) is output from the output terminal (OUT).
Inventors:
EHARA TSUNEO (JP)
NAKASHIMA TAKAHIDE (JP)
NAKASHIMA TAKAHIDE (JP)
Application Number:
PCT/JP2011/059341
Publication Date:
January 05, 2012
Filing Date:
April 15, 2011
Export Citation:
Assignee:
NIPPON ANTENNA KK (JP)
EHARA TSUNEO (JP)
NAKASHIMA TAKAHIDE (JP)
EHARA TSUNEO (JP)
NAKASHIMA TAKAHIDE (JP)
International Classes:
H01Q1/50; H01Q5/10; H01Q9/30
Foreign References:
| JPH05259770A | 1993-10-08 | |||
| JPH10209897A | 1998-08-07 | |||
| JPH09148961A | 1997-06-06 | |||
| JPH0548360A | 1993-02-26 | |||
| JPH02111947U | 1990-09-07 |
Attorney, Agent or Firm:
ASAMI Yasuo et al. (JP)
Yasuo Asami (JP)
Yasuo Asami (JP)
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Claims: