US 12,388,518 B2
Passive relay device and passive relay method
Yosuke Takeuchi, Tokyo (JP); Hisatoshi Kasahara, Tokyo (JP); Yosuke Okamura, Tokyo (JP); Junichiro Tamamatsu, Tokyo (JP); and Tomoki Murakami, Tokyo (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/798,060
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Feb. 6, 2020, PCT No. PCT/JP2020/004630
§ 371(c)(1), (2) Date Aug. 5, 2022,
PCT Pub. No. WO2021/157028, PCT Pub. Date Aug. 12, 2021.
Prior Publication US 2023/0114389 A1, Apr. 13, 2023
Int. Cl. H04B 7/145 (2006.01)
CPC H04B 7/145 (2013.01) 16 Claims
OG exemplary drawing
 
1. A passive relay device which relays wireless communication between an inside of a radio wave shielding structure and an outside of the radio wave shielding structure, the inside of the radio wave shielding structure defining a first enclosure with an outer edge and a height measured perpendicular to the outer edge, and a second enclosure adjacent to the first enclosure, the passive relay device comprising:
an internal antenna which connects with the inside, the internal antenna including a directional antenna disposed in the first enclosure and directed toward the second enclosure located farther from the internal antenna than the first enclosure, the directional antenna having a directionality with respect to a radio wave reception angle that is adjustable based on a distance from the passive relay device to the outer edge of the first enclosure and the height of the first enclosure;
an external antenna which connects with the outside; and
a connection part which connects the internal antenna and the external antenna.