Title:
LOGARITHMIC PERIOD TYPE ANTENNA, AND PROCESSING METHOD OF LOGARITHMIC PERIOD TYPE ANTENNA
Document Type and Number:
Japanese Patent JP2015076759
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a logarithmic period type antenna capable of sharpening directivity without changing the length of the antenna while maintaining good VSWR characteristics.SOLUTION: A first logarithmic period antenna element part 21a and a second logarithmic period antenna element part 21b are disposed with the rear end sides thereof opened at a prescribed angle on the basis of the tip end sides where elements are shorter, and a H plane half value width is narrowed to obtain sharp directivity. Power feeding parts 23a, 23b are provided at the inner sides of the tip parts of arms 22a, 22b of the logarithmic period antenna element parts 21a, 21b respectively. The power feeding parts 23a, 23b are made to face each other with an almost fixed interval kept between, and each of them has a prescribed length. When the logarithmic period antenna element parts 21a, 21b are disposed with the rear end sides thereof opened, since a mutual distance becomes wider and VSWR characteristics are deteriorated, the power feeding parts 23a, 23b are provided so as to supplement the space part between the logarithmic period antenna element parts 21a, 21b, and the interval therebetween, the length thereof and the like are adjusted.
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Inventors:
TAKAHASHI TOSHIHIRO
Application Number:
JP2013212333A
Publication Date:
April 20, 2015
Filing Date:
October 09, 2013
Export Citation:
Assignee:
HITACHI KOKUSAI YAGI SOLUTIONS INC
International Classes:
H01Q11/10
Domestic Patent References:
| JPS389954Y1 | ||||
| JPS516039Y1 | 1976-02-19 | |||
| JPS5211194B1 | 1977-03-29 |
Foreign References:
| US2981951A | 1961-04-25 |
Attorney, Agent or Firm:
Kurata Masatoshi
Yoshihiro Fukuhara
Nobuhisa Nogawa
Takashi Mine
Naoki Kono
Katsu Sunagawa
Morisezo Iseki
Takao Ako
Tadashi Inoue
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Yoshihiro Fukuhara
Nobuhisa Nogawa
Takashi Mine
Naoki Kono
Katsu Sunagawa
Morisezo Iseki
Takao Ako
Tadashi Inoue
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
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