Title:
アンテナ装置
Document Type and Number:
Japanese Patent JP5028720
Kind Code:
B2
Abstract:
A helical antenna capable of operating at a plurality of different resonant frequencies. The helical antenna has a first helical antenna element, a second helical antenna element arranged coaxially with the first helical antenna element and coupled to the first helical antenna element through capacitive coupling, and a metal connection directly connected only to the first helical antenna element to fed the helical antenna. The first helical antenna element is fed through one end thereof to function as a quarter-wave antenna. The second helical antenna element is fed through capacitive coupling to function as a half-wave antenna.
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Inventors:
Kiyoo Hira
Tetsuya Saito
Tetsuya Saito
Application Number:
JP2001210179A
Publication Date:
September 19, 2012
Filing Date:
July 11, 2001
Export Citation:
Assignee:
nec Network Products Co., Ltd.
NEC
NEC
International Classes:
H01Q1/24; H01Q5/10; H01Q5/378; H01Q5/40; H01Q9/32; H01Q11/08
Domestic Patent References:
| JP1051223A | ||||
| JP10242740A | ||||
| JP1098320A |
Attorney, Agent or Firm:
Masahiro Fujii
Masaki Goto
Masaki Goto