ANTENNA

Japanese Patent JP3949292

B2

PROBLEM TO BE SOLVED: To obtain an antenna capable of exhibiting its characteristics, without depending on the plane of polarization of incoming radio waves by substantially constituting the antenna from a substrate which is made of a net equipped with parasitic elements made of conductive material.
SOLUTION: A screen door type antenna 10 is constituted by arranging plural loop-shaped antenna elements 12 on a net member 11 which is a substrate constituting a screen door. The loop-shaped antenna elements 12 utilize both properties of a parasitic antenna short-circuiting a feeding point and a loop antenna. The parasitic antenna short-circuiting a feeding point in this way reradiates received radio waves. In this case, the phase of a reradiation electric field becomes different depending on the thickness and measurements of the lines of the elements 12 and can be both in-phase and anti-phase to incident waves. Further, because characteristics do not have directivity in a loop surface, polarization dependence does not exist in the surface. Then, it is possible to obtain an antenna which can exhibit characteristics, capable of shielding of electromagnetic waves of specific frequency and enhancement.

Yuji Ono
Kichi Sakae Kichi

JP26824698A

July 25, 2007

September 22, 1998

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NEC TOKIN CORPORATION

H01Q17/00; H05K9/00; H01Q1/44; H01Q7/00; (IPC1-7): H01Q17/00; H01Q1/44; H01Q7/00; H05K9/00

JP4134909A
JP9162589A
JP4280105A
JP1149503A
JP50024583A
JP10126091A
JP8330783A

WO1998035542A1

Kenho Ikeda
Keisuke Yamamoto

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