Title:
ANTENNA ASSEMBLY AND TRANSPONDER USING THE SAME
Document Type and Number:
Japanese Patent JP3823942
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a compact antenna assembly which prevents reflection from the end of a helical antenna element to provide a desired radiation pattern.
SOLUTION: The antenna assembly comprises a helical antenna for radiating circularly polarized radio waves which has first helical antenna elements at specified pitches and second helical antenna elements at a specified pitches provided between the specified pitches, a feed line connected to one end of each of the first and second helical antenna elements for feeding radio frequency signals, an antenna extension connected to the other end of each of the first and second antenna elements, and a radio wave absorber mounted on the antenna extension to cover the extension.
Inventors:
Uematsu Hiroyuki
Application Number:
JP2003151878A
Publication Date:
September 20, 2006
Filing Date:
May 29, 2003
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
H01Q11/08; H01Q17/00; H01Q1/24; H01Q1/52; (IPC1-7): H01Q11/08; H01Q1/24; H01Q1/52; H01Q17/00
Domestic Patent References:
JP5251920A | ||||
JP2001021643A | ||||
JP62061516U |
Attorney, Agent or Firm:
Shogo Takahashi
Tadahiko Inaba
Kanako Murakami
Nakatsuru Kazutaka
Tadahiko Inaba
Kanako Murakami
Nakatsuru Kazutaka