Title:
指向性デュアル周波数アンテナ装置
Document Type and Number:
Japanese Patent JP4272154
Kind Code:
B2
Abstract:
Consistent with an example embodiment, using two simple antennas with different frequencies of operation combined into an antenna arrangement a directional radiation pattern is obtained for both frequencies of operation. This is achieved by placing the antennas such that the first antenna acts as a director for the second antenna at the frequency of operation of the second antenna and the second antenna acts as a reflector for the first antenna at the frequency of operation of the first antenna. In another example embodiment, in the case of a monopole antenna the first antenna is shorter than the second antenna and can thus operate as a director while the second antenna is longer than the first antenna and can thus act as a reflector.
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Inventors:
Del Eitel Hendrix Sea
Application Number:
JP2004525670A
Publication Date:
June 03, 2009
Filing Date:
July 16, 2003
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
H01Q9/30; H01Q1/24; H01Q19/28; H01Q3/24; H01Q5/10; H01Q21/29
Domestic Patent References:
| JP60174503A | ||||
| JP2002135045A |
Foreign References:
| WO1998042041A1 | ||||
| WO1999065108A1 |
Attorney, Agent or Firm:
Kenji Sugimura
British tribute
Susumu Tsugaru
Akihiko Miyazaki
Fueda Shusen
British tribute
Susumu Tsugaru
Akihiko Miyazaki
Fueda Shusen
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