IP Library › Granted Patent US 12712261
Granted Patent B2
US 12712261 · App. 18/852,143 · Granted Aug 18, 2026

Antenna device

Inventors: Bunpei Hara (Gunma, JP); Yusuke Yokota (Gunma, JP); Kazuki Yamada (Gunma, JP)
Assignee: YOKOWO CO., LTD.
H01Q1/42H01Q1/3275H01Q1/528H01Q9/0407
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Quick Facts
Patent No.
US 12712261
App. No.
18/852,143
Granted
Aug 18, 2026
Kind
B2
Abstract

An antenna device includes: an antenna housing in which a hollow portion is formed; an antenna located inside the antenna housing and configured to perform at least one of transmission and reception of electric waves; and a scatterer configured to scatter the electric waves propagating through the hollow portion at a predetermined position of the antenna housing.

Claims (26)

1 . An antenna device comprising:

an antenna housing in which a hollow portion is formed;

an antenna located inside the antenna housing and configured to perform at least one of transmission and reception of electric waves; and

a scatterer configured to scatter the electric waves propagating through the hollow portion at a predetermined position of the antenna housing,

wherein at least one scatterer is present in a position in the antenna housing where a ripple of directional characteristics of the electric waves is smaller than in all other positions in the antenna housing.

2 . The antenna device according to claim 1 , wherein

a number of the scatterer is two or more,

at least one first scatterer is located at the predetermined position in the antenna housing, and

at least one second scatterer is located at a position in the antenna housing where a deviation of an intensity distribution of the electric waves in a vicinity of the predetermined position is relatively small.

3 . The antenna device according to claim 1 , wherein

a number of the scatterer is two or more,

at least one first scatterer is located at the predetermined position in the antenna housing, and

at least one second scatterer is located at a position in the antenna housing where a ripple of directional characteristics is relatively small.

4 . The antenna device according to claim 1 , wherein

two or more scatterers are present at positions substantially symmetrical with respect to an axis connecting a feed point of the antenna and a geometric center of the antenna housing.

5 . The antenna device according to claim 1 , wherein

the scatterer is present on an axis connecting a feed point of the antenna and a geometric center of the antenna housing.

6 . The antenna device according to claim 1 , wherein

the scatterer is configured with an ungrounded conductive component.

7 . The antenna device according to claim 1 , wherein

the scatterer is configured with a grounded conductive component.

8 . The antenna device according to claim 1 , wherein

the scatterer is configured with a non-conductive component.

9 . The antenna device according to claim 1 , wherein

the antenna is a resonant element extending vertically from a ground surface, and

the scatterer is arranged parallel to the antenna with a length of 0.1 to 1 times a wavelength λ of an operation frequency of the antenna.