公开(公告)号：US10309077B2

公开(公告)日：2019-06-04

申请号：US15361098

申请日：2016-11-25

Applicant: Electronics and Telecommunications Research Institute

Inventor： Eun Hee Kim ,  Ju Derk Park ,  In Hwan Lee ,  Ho Yong Kang ,  Jae Heum Lee

IPC: H01Q1/04 ,  E02D29/14 ,  H01Q1/40 ,  H01Q9/04 ,  H01Q5/364

Abstract: Disclosed is a manhole type omnidirectional antenna having a relatively small angle between a main beam direction and the Earth's surface and exhibiting omnidirectional characteristics to allow long-range communication, wherein the manhole type omnidirectional antenna includes a manhole cover installed in a manhole in the Earth's surface; a main body installed in a cavity of an upper surface of the manhole cover and configured to convert an electrical signal into an electromagnetic wave to wirelessly communicate with a gateway separated from the manhole cover; and a radome inserted into the cavity to cover the main body.

公开(公告)号：US10333222B2

公开(公告)日：2019-06-25

申请号：US15484449

申请日：2017-04-11

Applicant: Electronics and Telecommunications Research Institute

Inventor： Eun Hee Kim ,  Ju Derk Park ,  In Hwan Lee ,  Ho Yong Kang ,  Jae Heum Lee

IPC: H01Q5/50 ,  H01P3/08 ,  H01P1/203

Abstract: Provided is a method of improving a bandwidth of an antenna using a transmission line stub to enable long-range communication together with broadband matching. According to the method, it is possible to combine a transmission line stub in series or parallel with a feeding point, which is an antenna signal input/output point of a body serving as an antenna, and apply the transmission line stub to an antenna for wide use.