公开(公告)号：US20200235835A1

公开(公告)日：2020-07-23

申请号：US16744891

申请日：2020-01-16

Applicant: HITACHI, LTD.

Inventor： Hiroki YAMADA ,  Yuichi IGARASHI ,  Kenzaburo FUJISHIMA ,  Takashi YANO ,  Masami OONISHI

IPC: H04B17/391 ,  H04W16/18 ,  H04W64/00 ,  H04B17/318

Abstract: A computer system, which estimates a radio wave propagation characteristic in a space where a wireless communication system using structure data and system data is constructed, includes a computer having a processor and a storage apparatus and holds feature parameter information, which stores an entry that associates a parameter included in structure data, that is, a feature parameter which greatly contributes to an estimation result of the radio wave propagation characteristic in the space with a type of the space. When receiving a request for estimation of a radio wave propagation characteristic in a target space, the processor retrieves an entry associated with a type of the target space from the feature parameter information, and presents an interface to input a value of the feature parameter included in the retrieved entry as estimation structure data and an interface to input estimation system data.

公开(公告)号：US20240235707A1

公开(公告)日：2024-07-11

申请号：US18572496

申请日：2022-06-21

Applicant: Hitachi, Ltd.

Inventor： Masami OONISHI ,  Ryosuke FUJIWARA ,  Ken TAKEI

IPC: H04B17/391 ,  H04B17/354 ,  H04W16/18

CPC classification number: H04B17/3912 ,  H04B17/354 ,  H04W16/18

Abstract: A radio wave propagation simulation system is constituted with a computer including an arithmetic device that executes predetermined arithmetic processing and a storage device connected to the arithmetic device, and includes a model generation unit which generates a radio wave propagation model by the arithmetic processing of the arithmetic device, and the model generation unit generates a plurality of planes that simulate one surface of a structure, defines, as an attribute of each of the planes to be generated, a unit normal vector representing an orientation of each of the planes and generates a radio wave propagation model constituted with the generated planes.

公开(公告)号：US20210013616A1

公开(公告)日：2021-01-14

申请号：US16908906

申请日：2020-06-23

Applicant: Hitachi, Ltd.

Inventor： Masami OONISHI ,  Kenichi MIZUGAKI ,  Rintaro KATAYAMA ,  Ryosuke FUJIWARA

IPC: H01Q13/12 ,  H01Q13/18 ,  H01Q1/38 ,  E02D29/14

Abstract: An antenna device includes a conductive manhole cover for partitioning an internal space of a manhole and an external space, a wireless device installed in the internal space, and a base station that is installed in the external space and transfers a radio wave with respect to the wireless device. When a notch portion is formed on the edge of the manhole cover and the manhole cover is attached to an opening of the manhole, a slot-shaped void is formed. By using this void as a slot antenna, radio waves from the wireless device can be re-emitted to the external space. With such a configuration, it is not necessary to specially prepare a slot antenna, and a low-cost antenna device can be realized.

公开(公告)号：US20190267695A1

公开(公告)日：2019-08-29

申请号：US16276652

申请日：2019-02-15

Applicant: Hitachi, Ltd.

Inventor： Masami OONISHI ,  Kenichi MIZUGAKI ,  Ryosuke FUJIWARA ,  Rintaro KATAYAMA

IPC: H01Q1/04 ,  E02D29/14 ,  H01Q1/46

Abstract: An object of the present invention is to improve an antenna for IoT services intended for things that constitute an internal space. There is provided an antenna device including an antenna and a dielectric body. In an internal space which is constituted by plural faces including a first face which is an electrically conductive body, the antenna device is adapted to have a shape to be fit inside a hole in the first face. The antenna device is installed, not protruding from the hole to an outer space. The antenna and the dielectric body are placed in series between the internal space and the outer space.